When building your own home, there are many regulations to meet. Airtightness (which I covered in issue 199/July) is one such area. To recap, airtightness is normally measured as air leakage. Air leakage is the uncontrolled movement of air into and out of a building expressed as Xm³/hr/m²@50Pa or as the air change rate, expressed as Xach/hr@50Pa.
Which brings us on to the blower door test — this is the process on site that measures how airtight or not you have managed to make your building.
HOW DOES A BLOWER DOOR TEST WORK?
A blower door test is undertaken by installing a specially calibrated fan in either a window or door of the house. This fan is supported by a fabric surround that seals the whole opening. The fan pushes air into the
