A COMPLETE SOLUTION

Building codes and energy conservation standards continue to evolve, and today many are requiring proof of high-quality air sealing for buildings, with measurements being done through blower door testing.

BY JOHN SIEGENTHALER

Typically, the building envelope is depressurized using a flexible panel with a variable speed fan that’s temporarily in - stalled in the opening of an exterior door. By measuring the speed of this fan and correlating it to the slight (but measurable) difference in air pressure between the inside and outside of the building, it’s possible to determine the air changes per hour air leakage rate.

A leaky house could test out at 15 to