4 Installing the BlowerDoor Measurement System
BlowerDoor Standard
January 2022
33
4
Installing the BlowerDoor Measurement System
The BlowerDoor system is installed in an exterior doorway, usually in a French doorway on the lowest
floor being tested. It is installed in this location instead of in the main doorway of the building so that
the leakage of the main door is included in the airtightness test results.
Installation in the external door of a large room is a good option. Air must flow through the fan
unobstructed. A minimum clearance of 1.5 meters must be maintained around the fan (see
Appendix B).
Fig. 4.1
The BlowerDoor system is typically controlled from inside
the building. All BlowerDoor equipment (bags, frames, fans,
computer, paperwork, cable reel, etc.) is placed in the same
room as the testing device.
A power supply of 220-240 V is required (electrical outlet or
power cable from cable reel to worksite power distribution).
To prepare the building, close all external doors and windows, open all internal doors, and apply
temporary seals if necessary.
