News, products and personnel moves

University challenge

Victoria University engaged Applied Energy Saving Solutions (AESS) to conduct an energy audit of its Nicholson Campus at Footscray. AESS found that the domestic hot water system in one of the campus buildings was provided by a calorifier, which was connected to the space heating boiler. The large domestic gas boiler and its big primary and secondary circulating pumps had to run during summer to meet only the small domestic hot water load in the building by heating the water inside the calorifier. Because of this inefficient design, and also the low efficiency of the old calorifier, AESS proposed separating the domestic hot water circuit from the space heating boiler circuit and installing a solar hot water system with gas boosters. This would replace the old calorifier to supply domestic hot water to the building. AESS estimated that implementing this recommendation would save 87,390MJ in gas consumption annually, and 8,240kWh in electricity. This is equivalent to avoiding around 13.4 tonnes CO2 emissions.

Victoria University decided to implement the recommendation. AESS specified evacuated tube solar collectors for this project, due to their high efficiency compared to flat plate collectors. The mechanical contractor, selected by Victoria University, carried out the detailed design for this project and completed the installation last year. ❚

ASHRAE’s long view

US engineering body ASHRAE has launched its Vision 2030 webpage. The organisation says its Vision 2030 is about providing professionals in the building industry with the resources to drive the innovative and strategic improvements needed to foment the revolution of the built environment.

“The Vision 2030 webpage provides guidance to support intelligent design, construction, and operation for a more adaptable and resilient built environment,” says 2018–19 ASHRAE Presidential Member and Vision 2030 Chair Shelia J. Hayter. “We believe that the contributions of the Vision 2030 team will serve as a powerful resource to industry professionals and the general public alike.” The webpage features five sections: Connected communities, Built environment, Data and integration, Team processes, Member services, and Resources. Hayter leads a Vision 2030 team of 18, including fellow Presidential Fellow Thomas H. Phoenix, who is Vice-Chair of ASHRAE Vision 2030.

Go to ashrae.org/vision2030. ❚

A better future through refrigeration

The International Institute of Refrigeration (IIR) has published its first Activity Report, emphasising the essential role of refrigeration at the heart of the United Nations Sustainable Development Goals (SDGs). The SDGs are considered a blueprint to achieving a better and more sustainable future for all.

“Naturally, global sustainability cannot be achieved without refrigeration, as it is present in most past, present, and future areas of human activity,” the IIR says. “It is absolutely necessary for life, and accounts for nearly 20 per cent of the world’s electricity; a figure that is constantly increasing. Aligned with the institute’s ethos of “Refrigeration for sustainable development”, the Activity Report 2020 provides an overview on how the IIR’s work is linked to the SDGs.

“The report details how the IIR has clearly set its strategy and actions within the framework of the sustainable development of the refrigeration sector,” the IIR says of the Activity Report. “In concrete terms, this has resulted in new agreements with various international bodies and the drafting of documents of general interest to promote the role of refrigeration in this perspective.” Go to iifiir.org/en/iirpresentation ❚

Hop on the eCycle

Reliable Controls has announced a new initiative that it says will help customers minimise waste in the field: eCycle. The eCycle service allows authorised dealers to send nonrepairable Reliable Controls and peripheral partner devices to be disposed of in an environmentally responsible manner. When electrical and electronic equipment, including building controllers, is disposed of properly, electronic materials are recovered and can be used in new products. But Reliable Controls says programs for proper collection and disposal of e-waste vary widely by region. “With the new eCycle service, it doesn’t matter where in the world customers are,” says the company. “We will arrange for its authorised dealers to ship non-repairable controllers to a responsible recycling partner for disposal.” The products Reliable Controls manufactures follow the WEEE, RoHS 2, and R2 directives, which set collection, recycling, and recovery targets for electrical goods and restrict the use of certain hazardous substances.

“With the introduction of eCycle, authorised dealers can assure their customers that the Reliable Controls long-term, better-by-design approach not only provides them with excellent ROI, but also mitigates the negative impact of waste management; our products are recycled responsibly and built to last,” says Reliable Controls. Go to www.reliablecontrols.com ❚

Milestone for Matthews

“Since taking the helm as managing director, Paul has forged a reputation of excellence, through his attention to detail, robust design solutions and exceeding clients’ expectations,” says Steens Gray & Kelly general manager Ben MacLeevernan, Affil.AIRAH. Among Matthews’ many career highlights, MacLeevernan says the Joondalup Health Campus Redevelopment stands out. The project commenced in 2008 and comprised the major development of the existing tertiary public hospital, the construction of a new dedicated private hospital, along with associated central energy systems. Now a decade and a half later, the SG&K team are embarking on the second major redevelopment of this same site. “Aside from Paul’s enormous contribution to Steens Gray & Kelly, he has helped develop health design standards and guidelines, and mentored a great number of young engineers and drafters,” says MacLeevernan. “Longevity in business is becoming an increasingly rare attribute, and we take this moment to congratulate Paul on his impressive 30-year milestone with Steens Gray & Kelly.” Go to www.sgk.com.au ❚ This year marks a significant milestone for long-standing AIRAH member Paul Matthews, M.AIRAH: he is celebrating 30 years with Perth-based mechanical building services consultancy Steens Gray & Kelly. Matthews joined the firm in 1991, and quickly became an integral member of the team. By 1994 he had been promoted to associate and over the next seven years he cut his teeth in the Perth market, working on healthcare, laboratory and government projects. In 1997 he joined the partnership as a director, working alongside the original founding partners Nick Steens, Brian Gray and Max Kelly. Then in mid2001, following a strategic transition and the retirement of Kelly and Gray, Matthews took on the role of managing director, a position he has

Paul Matthews, M.AIRAH now held for 20 years.

See the heat with Testo

Measuring technology supplier Testo has released its thermal imager testo 883. “This thermal imager, which offers the best image quality and automatic image management, was developed and manufactured entirely in Germany, and greatly reduces the day-to-day workload of those who specialise in the efficient operation of plants,” the company says. The testo 883 thermal imager offers an infrared resolution of 320×240 pixels, which can even be expanded to 640×480 pixels with the builtin testo SuperResolution technology. Testo says the manual focus guarantees users full control of the thermal image. Testo says its SiteRecognition technology solves the problem of similar-looking images by automatically recognising the measuring location and saving and managing the thermal images. “This rules out any mix-ups, prevents errors during evaluation, and saves a lot of time by eliminating the need for manual image assignment,” the company says. “With the testo Thermography App, thermal images can be quickly analysed on a smartphone/tablet or shared with colleagues and managers. Readings from the testo 770-3 clamp meter are also integrated directly into the thermal image.” The testo 883 thermal imager is available now on its own or in a kit with telephoto lens, additional battery and charging station, from specialist dealers and also directly from Testo. Go to www.testo.com/en-AU ❚

Fan-forced recovery

Global electric motor and fan manufacturer Ziehl-Abegg has reported sales of €639 million (AU$995 million) in 2020 – an increase of around 1 per cent over 2019 – and is expecting continued growth in 2021. “The year 2020 was like a rollercoaster ride,” says Ziehl-Abegg CEO Peter Fenkl, “alternating suddenly and rapidly between border closures, material supplies being cut off, falling sales and rising order books.” COVID-19 regulations presented significant obstacles to production and sales. This was compounded by a global shortage of components. And, as Fenkl points out, they live with the threat of further disruptions. “No one knows if we’ll see the beginning of another downward trend next week,” he says. Ziehl-Abegg was forced to abandon its original sales plans for 2020. Strong early sales in elevator drive technology failed to compensate for a slump in ventilation systems. Fenkl says that these only started to catch up in the fourth quarter, enabling Ziehl-Abegg to ultimately post slight growth in annual sales. Go to www.ziehl-abegg.com ❚

Leading lights at Atelier Ten

Atelier Ten has announced the promotion of David Ritter, M.AIRAH, to director of the sustainable design consultancy’s Melbourne studio, and Priya Gandhi, M.AIRAH, to associate in Melbourne. Ritter has over 20 years of international experience in delivering environmentally sustainable design (ESD) solutions and leads the team of environmental designers in Melbourne. Gandhi is a sustainability advocate and analyst who leads the firm’s energy modelling and building performance practice. She speaks regularly at industry events – including AIRAH conferences – and participates in sustainability thought leadership forums. “Our interest has always been in creating great environments for people,” says Ritter, “and for this you need a great team of designers that understand both the physical and the invisible architecture to make a building both inhabitable and inspiring. “I’m excited by the opportunity that myself, Priya, and the rest of the team in Australia have to provide vision and leadership in delivering the net zero carbon goals set by the international Paris Agreement. Through shared knowledge, holistic design thinking, advanced technology and engineering solutions we can do this.” Go to www.atelierten.com ❚

A solution for modern spaces

Mitsubishi Electric Australia has introduced a new 9kW wall-mounted split system suited to large open-plan spaces that can often be hard to temperature control from a single unit. The MSZ-AS90VGD-A1 is designed for year-round service in large open-plan living areas thanks to its relatively large capacity. It also includes features such as advanced air filtration, dual barrier coating, and long airflow operation. The dual barrier coating on the unit’s heat exchanger and facial surfaces is designed to prevent dust and greasy dirt from adhering to it. Mitsubishi Electric says this not only helps the unit stay cleaner for longer, but also makes cleaning the unit easier. According to Atesh Mani, National Product Manager at Mitsubishi Electric Australia, Australians are now seeking air conditioners that do more than cooling and heating – they want appliances that also focus on health and wellness. “Delivering clean, fresh and healthy air is a priority for us,” says Mani. “The AS90 uses a built-in anti-allergy enzyme filter which works to trap allergens such as mould and bacteria by using enzymes to decompose them.” Go to www.mitsubishielectric.com.au ❚

Suzanne Toumbourou

Toumbourou bids ASBEC adieu

The Australian Sustainable Built Environment Council (ASBEC) has announced that Executive Director Suzanne Toumbourou has been appointed CEO of the Australian Council of Recycling (ACOR) and will conclude her tenure at ASBEC at the end of June 2021. “It has been an immense pleasure and privilege to work with ASBEC’s members over the past decade,” says Toumbourou. “We have achieved so much real impact together, from mapping the emissions reductions possibilities presented by our buildings and infrastructure to securing cross-government support for improved energy performance measures in Australia’s Building Code. “While I’m proud to have been part of the journey up to now, I know ASBEC’s members will continue to pursue their collective vision of a sustainable and resilient built environment in Australia.”

Alison Scotland, former Senior Stakeholder Engagement Manager at Standards Australia, has been appointed as ASBEC’s Interim Executive Director. She will work closely with Toumbourou during an initial handover period, and continue in the role until later in 2021.

Go to www.asbec.asn.au ❚

Aircon alliance

Panasonic Australia and Pacific Ventilation, a wholly-owned subsidiary of the Systemair Group, have announced they will work together to market a large-scale commercial air conditioning and ventilation solution. Locally, the first stage of the collaboration will see Panasonic Australia and Pacific Ventilation work together to market Pacific Ventilation’s indoor DX air handling units and Panasonic’s variable refrigerant flow (FSV) outdoor units. Panasonic says this is in line with its strategic partnership with Systemair AB Group, which seeks to leverage existing technology and expertise from both parties to create bespoke project solutions. The solution is designed for applications such as shopping centres, large grocery stores and hospitals. Tomoki Miyamoto, Affil.AIRAH, Country Head, Air Conditioning, Panasonic Australia, has pointed to the opportunities the deal will create. “This opens up a new line of business for Panasonic,” says Miyamoto, “and we are excited to be working together to satisfy customers’ growing requirements for ventilation solutions in the large commercial sector.” Pacific Ventilation Managing Director Peter Gibson, Affil.AIRAH, has also hailed the partnership. “This new offering reflects the engineering excellence of two companies dedicated to improving people’s lives through cleaner, safer air,” says Gibson. Go to aircon.Panasonic.com.au and www.pacificventilation.com ❚

Showroom in cyberspace

Mitsubishi Heavy Industries Air-Conditioners Australia (MHIAA) has announced the launch of its Virtual Showroom Innovation Park.

Users guide themselves around the virtual showroom, and can access information on the latest product offerings, from small residential through to large commercial solutions. “Through this tool, customers can not only explore our product range, but they will also be provided with up-to-date product images and key features and functions on each product,” says MHIAA Managing Director Yuji Ito.

If you do visit the park, you will notice some new awards stamps on the company’s split systems. MHIAA has been named by Finder as the Best Rated Split System Air Conditioner Brand in the latest 2021 retail awards.

The 2020/21 Finder Customer Satisfaction Awards recognises Australia’s best brands and are voted on by Australians. Within the split system category, consumers rated air conditioners in terms of quietness, performance, features and functions, and value for money. MHI air conditioners achieved the highest rating in every single category, taking out the 2020/21 Retail Award. Go to virtualinnovationpark.com.au ❚

Long night for a good cause

Fujitsu General ANZ’s Managing Director Philip Perham will be participating in his fourth Vinnies CEO Sleepout on June 17, 2021. Spending the night with only a sleeping bag, pillow and some cardboard for comfort and protection, Perham will join hundreds of CEOs and business owners at White Bay Cruise Terminal, on Sydney Harbour, to help raise awareness of homelessness. “Unfortunately, homelessness can affect anyone at any time,” says Perham. “The Australian Bureau of Statistics has found that more than 116,000 Australians are experiencing homelessness at the moment. Of these, 60 per cent are under 35 years of age, 44 per cent are women and sadly, 13 per cent are children 12 years and under. Perham says that Philip Perham participating in the Vinnies CEO Sleepout is an opportunity to raise awareness of the issue and support the St Vincent de Paul Society to achieve its goal of reducing homelessness and poverty. He has set a personal fundraising target of $50,000. Go to www.ceosleepout.org.au ❚

HVAC Hygiene BEST PRACTICE GUIDELINES

HVAC HYGIENE AIRAH BEST PRACTICE GUIDELINES

16

TABLE2.3 MINIMUM HVAC system Classi cation. (See 1.5) ACCEPTABLE SYSTEM HYGIENE HVAC System or Component (See 1.6) AHU STANDARDS Minimum hygiene level (See Table 2.1) Clean Supply system – moisture producing equipment Clean

Clean

General UseSystems

Air intakes and exhausts Supply air system, or Return air system, or Outside air system Pre Filtration – Moderate Post Filtration – Light No Filtration – Light Moderate

Exhaust air system Non-ducted refrigerated a/c Evaporative coolers Light Light

Clean

Special UseSystems

AHU Supply system – moisture producing equipment Air intakes and exhausts Supply air system, or Return air system, or Outside air system Clean

Clean Pre ltration – Light Post Filtration – Clean No Filtration – Clean Moderate

Exhaust air system Non-ducted refrigerated a/c Clean

Clean

Evaporative coolers www.airah.org.au If fungal contamination in or on a system component is suspected, but not readily identi able through visual assessment, then surface samples should be taken for laboratory analysis. Recommended procedures for taking surface samples for fungal contamination assessment are detailed in Appendix D. If a system or component has been con rmed, by visual observation or analytical assessment, to be mould contaminated then the a ected system or system components should be decontaminated. Decontamination or remediation of a mould a ected system should only be undertaken if a thorough assessment of the system has been undertaken and not an assessment based on limited samples. Note: Decontamination of a HVAC system due to mould or microbial contamination is a specialised activity that is outside the scope of this Guideline. State and Territory governments may have speci c requirements for the reporting and control of microbial contamination within HVAC systems. System owners and operators should ensure that they are familiar with the regulatory requirements of the jurisdiction in which they operate. Samples for fungal analysis need to be sent to a mycological laboratory for testing and assessment, and identi cation as a fungal growth site. Details of sample removal, transport, assessment and analysis should be coordinated with the testing laboratory. Fungal species identi cation may be helpful to determine whether there is a shift from the indoor to the outdoor concentration. This is needed in order to perform a proper risk assessment. Clear communication between the building owner and the HVAC cleaner should be established in order to determine an acceptable fungal level following cleaning and remediation of the HVAC system. Once the system has been decontaminated and cleaned the system hygiene level should be veri ed, see Section 3. Note: It should be noted that certain HVAC special use applications such as clean rooms, operating theatres and the like may have speci c requirements for higher levels of HVAC hygiene determined by other governing bodies, manufacturing/processing activities, regulations and the like. THE AUSTRALIAN INSTITUTE OF REFRIGERATION, AIR CONDITIONING AND HEATING

HVAC HYGIENE

HVAC HYGIENE BEST PRACTICE 17 AIRAH BEST PRACTICE GUIDELINES In particular the presence and source of moisture supporting any mould growth in the system should be identi ed and prevented. Mould in buildings more generally is covered in the World riA roodnI rof senilediuG )OHW( noitasinagrO htlaeH Quality, Dampness and Mould. 2.5.4. Asbestos If HVAC system contamination by asbestos dust or bres is suspected then samples should be taken and analysed. If the presence of asbestos contamination is con rmed the entire system should be decontaminated by competent persons. Note: Decontamination of a HVAC system due to asbestos contamination is a specialised activity that is outside the scope of this Guideline. If potentially friable asbestos containing materials are found within a HVAC system, the system should be shut down, the asbestos containing material should be removed by licensed asbestos removalists and alternative insulation noitalusni eht sedulcni sihT .ecalp si ni dellatsni stcu tdorp board surrounding duct mounted electric heaters if it is veri ed to contain asbestos. Note: All asbestos removal work should be carried out in accordance with NOHSC:2002 – National Code of Practice for the Safe Removal of Asbestos and all other applicable state and local government regulations and requirements. Once all asbestos materials and contamination has been removed the entire HVAC system should be cleaned and the system hygiene level should be veri ed. The components should be labelled as asbestos-free and the hazardous materials/asbestos register updated. 2.5.5. Deterioration or non-porous surfaces When the surface of non-porous components are deteriorated and contributing particulates or odours to the air stream, or otherwise adversely a ect the quality of the air moving through the system, restoration should be performed and inspection/cleaning of all downstream components carried out as required. 2.5.6. Deteriorationofporous surfaces and linings When internal HVAC insulation or lining materials are found to be deteriorated and traces of the insulation or lining product found within the system components, the deteriorated surfaces should be restored and the a ected components of the system should be cleaned and the entire system inspected for contaminants and cleaned as required. 2.5.7. Water damage All HVAC system surfaces and components subjected to water damage should be evaluated to determine salvage ability and likely success of any restoration activity. In particular any internal insulation should be investigated for evidence of water logging or fungal growth. Any system components or ducts deemed salvageable should be thoroughly cleaned and free from microbial growth. Any water a ected or water logged insulation products should be replaced. Any water damage due to condensation within the system also needs to be assessed and the cause of the condensation identi ed and mitigated. Any water leaks (pipes, building structure) need to be identi ed and repaired prior to undertaking any HVAC cleaning or restoration work. 2.5.8.Fire and smoke damage All HVAC system components subjected to heat or smoke should be evaluated to determine their integrity and likely success of any restoration activity. In particular all re and smoke dampers and all electric duct mounted heaters should be assessed for tness for purpose in accordance with the survey and maintenance protocols of AS 1851. Any components or surfaces deemed unable to withstand proper mechanical cleaning and restoration are beyond salvage and should be replaced. All porous surfaces subjected to re or smoke damage should be evaluated for friability and odour retention following the cleaning decalper eb dluohs elbairf sa dessessa saera ynA .ssecorp or resurfaced. Any materials likely to impart odours to the supply air stream should be replaced. Any component surface exhibiting damage due to heat exposure should be restored to an acceptable condition or replaced. Consideration should be given to any residual smoke residue that may remain on the internal surfaces of the system. Certain types of smoke residue can be highly corrosive and lead to eventual deterioration of the a ected component surface. Some smoke residues can also be ekoms ro taeh ,ekoms yb detce asecafrus latem ynA .cixot residue should be evaluated by competent persons to determine if restoration will be achievable or e ective. Any components a ected by water from re suppression activities should be assessed in accordance with 2.5.7. 2.5.9. Building or renovation contamination Any HVAC system subject to this contaminant category should be evaluated to determine the hygiene level of the system. Any system or components found to have accumulated general dust and particulate debris greater than the levels speci ed in Table 2.3 should be cleaned. Depending on the type of contamination encountered, 12 AIRAH BEST PRACTICE GUIDELINES www.airah.org.au 13 HVAC HYGIENE AIRAH BEST PRACTICE GUIDELINES www.airah.org.au 1.8.4. Unusualcontaminationevent HVAC systems and components should be inspected after any unusual contamination event such as a re or ood or any renovation/building activities. Unusual contamination events are assessed in accordance with 2.5 of this Guideline.1.9.HVACrestoration Where HVAC systems or components cannot be adequately cleaned they should be repaired or replaced. 1.10. Bestpracticehygienemanagement1.10.1. PrinciplesBest practice HVAC hygiene management can be achieved through the implementation of a few relatively simple management practices. • Filter maintenance – Filters are the primary defence against dust and particulates. System lters should be regularly inspected and maintained, at least in accordance with the requirements of AS/NZS 3666.2 and AIRAH DA19 on HVAC&R maintenance. The initial system assessment should include a review of the lter speci cations to determine if lter application is optimal for the HVAC system, including the lter type, lter rating, system air ow and pressure, the likely contaminant pro le and the general quality of installation and maintenance. Comprehensive information on the selection and application of air lters is provided in AIRAH DA15. • Management of moisture – moisture management is critical for minimising the potential for fungal contamination and any spills, leaks or wetting of HVAC systems or components should be dried out and inspected as soon as is practicable. • Inspection and assessment – All HVAC systems should be periodically inspected and assessed in accordance with the recommendations of this Guideline. • Clean, restore and verify hygiene level – once systems or components have been identi ed as contaminated, cleaning and restoration work should be undertaken immediately including verifying the cleanliness of the restored system. • Good housekeeping – HVAC hygiene also requires a common sense approach to limiting contaminant generating activities within a building and promptly responding to any unusual contamination event. Even everyday tasks such as cleaning (vacuuming, disinfecting), food preparation and document printing and copying may be inadvertently introducing unacceptable contaminants into the HVAC system. 1.10.2. Records c Best practice HVAC hygiene management requires good building and system documentation including up to date operation and maintenance manuals, accurate as installed system drawings showing access points and original system commissioning data.The building owner should maintain records of any conducted HVAC Hygiene Inspection Reports along with records of any cleaning or remedial works and any hcus fo tluser a sa tuo deirrac noita irev enigyh metsy e s inspections. Maintaining these records builds up a hygiene pro le of a building or system over time that assists in HVAC hygiene management. ytilauq ria roodni ot gnitale stroper yna ,noitidda n r I assessments or any energy management reports should also be retained with these records.1.11.HVACstandardsandregulations The primary design standards for HVAC systems are AS 1668.2 which deals with ventilation requirements (minimum outdoor air, location of intakes and discharges, exhaust rates) and AS/NZS 3666.1 which deals with microbial control. AS/NZS 1668.1 details requirements for re and smoke control associated with mechanical ventilation systems. The primary standard for HVAC systems operation and maintenance is AS/NZS 3666.2. Its primary focus is the control of microbiological contaminants such as Legionella sp. in building water and air handling systems but it also focuses on general HVAC hygiene. The standard covering the maintenance of the re and smoke control features of HVAC systems is AS 1851. AS/NZS 1668.1, AS1668.2 and AS/NZS 3666 part 1 and part 2 are called up in the Building Code of Australia as primary referenced standards and are mandatory in all states and territories of Australia. Apart from building legislation there may be individual state speci c occupational health and safety legislation and regulations relating to HVAC hygiene that should be complied with as they are relevant to both operation and maintenance.The selection and application of general lters are covered by AS 1324 and minimum application requirements for the ltration of ventilation systems are speci ed in AS 1668.2. HEPA lters are classi ed in AS 4260. It is not intended that the recommendations of this Guideline con ict with the requirements of any of these mandatory standards or with the requirements of any Commonwealth, State or Territory regulation. 2.1. Hygienelevelsde nedThe descriptions listed in Table 2.1 , provide the HVAC system hygiene inspector with four hygiene levels to determine if cleaning is required when assessed against the minimum acceptable hygiene standards as listed in Table 2.3. 2.2. AccessforinspectionAccess is required in order to inspect the internal surfaces of all components and a representative portion of the internal surfaces of the HVAC systems as de ned in 1.6.12. AS/NZS 3666 parts 1 and 2 both require adequate provision of access for maintenance. Inspections and Systeminspectionandassessment 2 TABLE2.1 DEFINITIONOFHYGIENELEVELS Hygiene Level Description1. Clean No visible dust, debris or other contamination. 2. Light elttil htiw ecafrus tnenopmoc eht revo tnetsisnoc tsudlareneg en fo reyal elbisivylthgils yln O to no variations in density. Component surface remains visible beneath the ne layer of dust. 3. Moderate Visible levels of general dust with varying density and limited areas of accumulated ne debris. Component surface is still visible in some areas beneath the ne dust but in isolated sections may not be. 4. Heavy High levels of visible dust, debris, bres or any other contamination that cover the component. Component surface is barely if not at all visible beneath the contamination. Reference images for the four de ned hygiene levels are provided in Appendix F . HVAC Hygiene GUIDELINES

www.airah.org.au

AIRAH’s HVAC Hygiene Best Practice Guidelines are available to purchase in hard copy.

Establishes the criteria for evaluating the internal cleanliness of HVAC system components Clearly determines when cleaning is required, according to the building use Describes the components of HVAC systems to be evaluated Describes the types of contamination likely to be encountered and includes for post re and ood damage assessments Speci es minimum inspection frequencies for various HVAC systems and components for scheduled maintenance programs