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w American Society of Heating and Ventilating Engineers Guide, 1928 and C. C. Schrader, reported in Transactions, A. S. H. and V. E., Vol. 30,1924 and Vol. 31, 1925 and others may be conveniently adapted to calculation purposes. Tables 14 and 15 as well as Figs. 4, 5, and 6 present values from the recent tests by Houghten and Schrader at the Research Laboratory of the atAmerican Society of Heating and Ventilating Engineers Fig. 4. Results of Tests of Leakage through Various Parts of Window and Frame Pittsburgh. Table 14 and Fig. 4 based on the report Transactions, Vol. 30,-1924, No. 686 while Table 15 and Figs. 5 and 6 are based on data presented in the Transactions, Vol. 30, 1924, p. 313. . Air Changes Taking Place under Average Conditions Exclusive of Air Provided for Ventilation Kind of Room or Building Rooms, 1 side exposed Rooms, 2 sides exposed Rooms, 3 sides exposed Rooms, 4 sides exposed Rooms with no windows or outside doors Entrance Halls Reception Halls \ Living Rooms Dining Rooms Bath Rooms Drug Stores Clothing Stores Churches, Factories, Lofts, etc. Number of Air Changes Taking Place per Hour 1 im 2 2 M to % ' 2 to 3 2 1 to 2 1 to 2 2 2 to 3 1 M to 3 Table 14 gives the leakage through a 13 in. brick wall, between the frame and the brick, the leakage for a plain window not weather-stripped and the leakage for the same window fitted with a good weather-strip for various wind velocities. , Table 15 gives the leakage in cubic feet per hour per foot of crack per mile wind velocity for a plain frame window and also for a frame window fitted with weather-stripping. The leakage is given for various cracks 46 T a b l e 14. A ir L e a k a g e in C u b ic F e e t per H our an d B .t .u . N ecessary to H eat Such L e a k a g e from 0 to 70 D e g . F a h r . for C racks n d ic ated a n dI in . Clearance, W indow U nlocked Chapter I--Calculating the Heat Losses from Buildings 4'OUIO^OO < X' <at Uto s giS gS| Cu <z5 52 Plain trippedl Wood inaow 3.3w2 jus 'ifliomc'lo 'O NOON^d<'000 rHp-fomO'fOoo B.t.u. tO 04 iNints'Oomoo 00 co CN ^ ^ r~ 6 vo rf Leakage Cu. Ft. per Hour iooooooo 0O4T0-If^/a3 *0TtH-'.>N'00f~'0T\VnlO* ihvOOOqOOO 0T\j0>0N'OO>UO7 O-0J4O<CHv4O'C0OO00a 0OOt--O'Ov'OoO < 04 fO *0 oO *-- oooooooo mooomOO'O.O moOOOOOOO N) OoON'O WO O' Leakage Cu. Ft. B.t.i per Hour (N'-'O'O'tOfOOO ^OOhOO rjrom'O* o-' Per Fi C/3 at < jrC*t8tx3..XO. > o. 0*000 0000 V)N0-t >--6C400Q^ I0T) 0*0000000 y-- o ~*o>4 $ 47 sfgg-Jl H ; s fss ei < -< o> C --3 1:1 ; 3 > <n 3.80 8.64 14.9 29.1 44.3 75.6 1 1 1 .0 149.0