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AMERICAN SOCIETYOF BEATING & IYENTI1ATIN6 ENGINEERS GUIDEJ923 ; AMERICAN SOCIETYOF BEATING & YENTIEATIN6 ENGINEERSGDIDE.19230 Instead of using a certain number of air changes as a basis for esti mating infiltration losses many engineers use the lineal feet of window and outside of door cracks. Where the glass and door area is small in F ig . 1. T o tal 4*jf ilt r a t io n L e a k a g e for V ar io u s W indo w s T ested F ig . 2. n f il t r a t io n L e a k a g e T hrough t h e Pe r im e t e r of t h e Sash O n lyI times (2) number of air changes per hour times (3) the difference in tem perature between the inside and outside times (4) 0.02 heat units. Example.--What is the heat loss through infiltration from a living room containing 2,000 cu. ft. of space to be heated to 70 deg. in zero weather and figuring two air changes per hour? ~ 2000 X 2 X 70 X 0.02 = 5,600 heat units. 4 V/ir W Aff (7/V//H JO AJ./3CT73A OJUO/OM proportion to the cubical contents, the loss should be checked with the air change method, so that a minimum equivalent to one air change is allowed. This is necessary in order that sufficient heat will be available 5