Our team uses the ‘big building fan’ or ‘modified blower door’ (please see our ‘How it works’ FAQs above) to measure building envelope leakages. When they undertake a pre-seal air tightness test, the building’s initial leakage value will be recorded.
The blower door is calibrated to meet ASTM Standard E779, E1554, CGSB-149.10- M86, EN 13829, ATTMA Technical Standard 1, NFPA 2001, RESNET, and USACE.