Effect of frame caulking and storm windows on infiltration around and through window

Describes apparatus and test procedure of tests made to show the effect of caulking the crack between the brick wall and window frame and the effect of applying storm sash to the window on air leakage rates. Concludes that the crack between the brick wall and window frame is a very important factor in calculating the infiltration into a room, but that this source of leakage can be practically eliminated by caulking the crack. Finds that the application of storm sash does not materially decrease the infiltration of a tight fitting window, but does give a large saving if the crack and clearance of the window is large.Application of a wool strip between the frame and storm sash reduced the infiltration appreciably.