Basics Of Air Infiltration
Air infiltration is often simply abbreviated AI by contractors and industry experts. It's an important term, along with U-factor, SHGC and VT, in determining how energy efficient a window is. The term refers to the amount of air that is able to pass through window unit and will fall somewhere between .30 and 0. Anything over .20 is horrible, anything under .12 is decent and anything under .06 is quite good.