Alkhaddar R M, Dewsbury J, Orlowski R
Bibliographic info:
Air Infiltration Review, Vol 11, No 2, March 1990, pp 7-9, 2 figs, 3 tabs.

AC pressurisation is a method for measuring the airtightness of buildings. This technique, which is also called the infrasonic method, employs a reciprocating piston or bellows to impose a sinusoidal small change in volume inside the building