DIFFUSERS
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diffusers www.gdl.co.uk
GDL AIR SYSTEMS LTD
High Induction Slot Diffusers
f Slot Qty
b c1 c2 d e f
T. 01457 861 538
F. 01457 866 010
1 1xf 31 32 37 35 65 17
2 2xf 63 65 70 67 98 17
u
3 3xf 96 97 102 100 130 17
4 4xf 128 130 135 131 163 17
5 5xf 161 162 167 165 195 17
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Technical Data Linear Slot Diffusers (High Induction) Supply qm (l/s) (1000mm)
f=1>6 (Slot Quantity)
Ps (Pascals)
NR
Note
20
1xf
6
18
1xf
14
29
2xf
4
13
1xf
26
37
2xf
6
21
This diffuser utilises high induction airflow principles which ensure that the supply air velocity rapidly decreases to within 0.25 m/s just 0.5 metre from the diffuser. As such the usual air throw pattern typical of a standard slot diffuser does not apply and therfore is not shown.
3xf
3
11
2xf
10
27
3xf
4
17
4xf
3
10
2xf
14
32
3xf
6
22
4xf
4
16
2xf
20
37
3xf
9
27
4xf
5
20
2xf
26
40
3xf
11
31
4xf
6
24
5xf
4
18
3xf
14
34
4xf
8
27
5xf
5
22
6xf
4
17
3xf
18
37
4xf
10
30
5xf
6
25
6xf
4
20
4xf
16
36
5xf
10
31
6xf
7
27
4xf
23
41
5xf
14
36
6xf
10
32
5xf
20
41
6xf
14
36
5xf
26
44
6xf
18
40
30
40
50
60
70
80
90
100
125
150
175 200
Selection Example: Required Air Volume: Length of Slot Available: Max. Pressure Differential: Max. Noise Level:
350 l/s 5.0 metres 10 pa NR 30
Divide the required air volume of 350 l/s by the maximum length of Slot available. 350 = 70 l/s/m 5 From the technical data table we can select a 3 Slot diffuser which gives 9 pa and NR 27 both within the set requirements. 1 Qty. Y4H3B+8C 5000mm Long
High Induction Slot Diffuser
Fixings High Induction Slot Diffuser Fixings
Installation into G7010+80 plenum box +8 Concealed Rear Brackets
G7010+80 plenum box
50
T. 01457 861 538
F. 01457 866 010
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Linear Slot Diffusers
Slot Quantity
T. 01457 861 538
F. 01457 866 010
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51
Linear Slot Diffusers
52
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Technical Data Linear Slot Diffusers (Y - Model)
T. 01457 861 538
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53
Technical Data Linear Slot Diffusers (Y - Model) Supply
54
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Technical Data Linear Slot Diffusers (Y - Model) Extract
T. 01457 861 538
F. 01457 866 010
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55
Narrowline Slot Diffusers
56
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Two-way Narrowline Slot Diffusers
T. 01457 861 538
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57
Technical Data Narrowline Slot Diffusers (Q- Model)
58
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Adjustable Jet Nozzles
Size A(160) B(200) C(250) D(315) E(400)
A 158 198 248 313 398
B 170 210 260 325 410
C 216 273 318 400 483
D 82 108 136 174 230
E 21 30 39 52 71
F 95 111 143 166 199
Please contact the office for detailed technical specification.
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Rota-Jet Diffusers
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Technical Data Rota-Jets
62
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Technical Data Rota-Jets
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Technical Data Rota-Jets 64
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Technical Data Rota-Jets
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Circular Face Air-Jets
66
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Air-Jets
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Air-Jets
68
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Technical Data Air-Jets
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69
Technical Data Air-Jets
70
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Multi-Cone Ceiling Diffusers
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Multi-Cone Tile Replacer Diffusers
72
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Multi-Cone Ceiling Diffusers
T. 01457 861 538
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Multi-Cone Ceiling Diffusers - Set Into Lay In Ceiling Panel
Max Neck Size = C x D - 200
74
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Multi-Cone Ceiling Diffusers Core Options
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Technical Data Multi-Cone Diffusers
76
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Technical Data Multi-Cone Diffusers
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Technical Data Multi-Cone Diffusers
78
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Technical Data Multi-Cone Diffusers
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Technical Data Multi-Cone Diffusers (Extract)
80
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Perforated Diffusers
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Technical Data Perforated Diffusers
82
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Technical Data Perforated Diffusers
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Curved Vane Diffusers
84
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Angled Vane Diffusers
T. 01457 861 538
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Curved Vane Diffuser Core Options
Angled Vane Diffuser Core Options
86
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Technical Data Curved / Angled Vane Diffusers S240V Curved Vane Diffusers S940V Angled Vane Diffusers - Multiply Throw x 0.8 and -2NC
T. 01457 861 538
F. 01457 866 010
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Circular Multi-Cone Diffusers
88
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Technical Data Circular Multi-Cone Diffusers
T. 01457 861 538
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89
Technical Data Circular Multi-Cone Diffusers
90
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Fixed Circular Diffusers
T. 01457 861 538
F. 01457 866 010
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91
Technical Data Fixed Pattern Circular Diffusers 92000 / 92100
92
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Air Valves
T. 01457 861 538
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Air Valves Extract
94
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Air Valves Supply
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Polypropylene Air Valves
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Laminar Flow Diffusers
96
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Laminar Flow Diffusers
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Technical Data Laminar Flow Diffusers
98
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Fixed Blade Swirl Diffusers
T. 01457 861 538
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Fixed Blade Swirl Diffusers
100
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Swirl Diffusers
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Swirl Diffusers
102
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Swirl Diffusers
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Swirl Diffusers
104
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Swirl Diffusers
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Perforated Face Swirl Diffusers
106
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High Capacity Swirl Diffusers
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High Capacity Swirl Diffusers
* Note 88H20 and 88B20 H= D + 175 88P20 H= D + 150 1
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Floor Swirl Diffuser Description
Designed for supply air applications, the floor swirl diffuser is suitable for installing into floors with a pressurised void, or can be ducted using an additional plenum box. The diffuser includes an integral baffle, which can be adjusted to provide horizontal or vertical discharge patterns, along with a combined damper and dust basket.
Construction
The face plate and mounting ring are manufactured from cast aluminium, while the dust basket and baffle are formed from sheet mild steel. The diffuser is supplied complete with fixing cleats to suit a floor thickness up to 45mm.
Finish
The face plate is plain cast aluminium as standard, or can be polyester powder coated as required. The rear dirt collection basket and baffle arrangement are powder coated matt black as standard.
Size and Weight
The diffuser is available in size 200mm dia only and weighs 1.4kg.
Size
ØA
ØB
ØC
E
200
236
190
160
19
ØD
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Floor Swirl Diffuser - DN200 + Selection Data
DN200 + SELECTION DATA
q (l/s)
14
16
20
25
30
40
Lt Horizontal (M)
0.5
0.6
0.7
0.9
1.1
1.4
Lt Vertical (M)
0.62
0.72
0.9
1.1
1.3
1.8
Ps (Pa)
13
16
26
40
60
105
NC Horizontal Throw
<15
15
22
26
32
45
NC Vertical Throw
<15
<15
15
20
25
33
Pressure drop figures given above are with the combined dust basket damper set to the fully open position and with the diffuser set to a horizontal throw pattern. Apply a correction factor of Ps X 0.9 for vertical throw settings. Damper adjustment will influence the pressure drop and noise figures. Apply the following correction factors: Damper position
50% Open 25% Open
Ps X 1.4 + 2 NC Ps X 2.0 + 8 NC
Throw values given are at 0.5 M/s Vt and are valid for horizontal throws with a Td-10oC to 20oC. Vertical throws will reduce when used for cooling, in this case apply the following factors.
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Td 0o
Lt X 1
-4o
-6o
-8o
-10o
Lt x 0.7
Lt x 0.6
Lt x 0.5
Lt x 0.45
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Displacement Diffusers Description
GDL’s range of high quality displacement diffusers are designed to introduce cool clean air into the occupied zone at low level. By introducing air at low level and at low velocity, the air ‘pools’ at floor level rather than mixing with the room air. As the room air is warmer than the incoming air it is displaced to high level where it can be extracted, thus creating a layer of cool clean fresh air at occupancy level.
Construction
Manufactured from perforated mild steel sheet with mild steel capping and plinth. The units are polyester powder coated to RAL9010 white as standard, other colours are available on request. Stainless steel construction is available as an option, these will usually be manufactured in grade 304 Stainless and finished to a dull polish. All units can be reinforced for use in areas where a more robust diffuser is required. Duct covers can be provided when required.
Size
A large selection of shapes and sizes are available, including square, round, half round and bow front, as well as column surrounds. We can also manufacture bespoke units to suit your application. Please contact our sales office to discuss your size and shape requirements.
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