4 Installing the BlowerDoor Measurement System
BlowerDoor Standard
January 2022
39
4.3
Installing the BlowerDoor fan, flow rings, and speed controller
Fig. 4.12
For a negative pressure test, fit the fan into the elastic collar in the
panel so that the flow rings are facing into the room. The rubber
pad on the bottom of the fan is set on the lower frame brace. The
elastic collar should fit snugly around the fan.
Fig. 4.13
The Velcro strap on the cross bar directly above the opening in the
panel holds the fan in place. Pull the strap through the handle on
the fan and secure it.
Fig. 4.14
Begin the test with flow rings A, B and C installed.