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CHAPTER 19
1951 Guide
% Forced Warm Air Systems
Tamj3 7 Determination op Free Area and Pbefflura Loss of AA register for 22 Deg Deflection op Air*- b- * * *
Reaister Free Area in Square Inches {Upper value in each group) PwLre Loss in Inches of Water {Lower value tn each group)_________ _
Residential Use
Reo. I
Sub OB Eqtjiv- J
ALENT 1
Pres-
SUBB Loss
Distance From Rbgobteb to Opposite Waix.________
Cnt
31-34 85-39 40-49
60-69 70-79
700-739
A
243 186 | 127 0.02 0.031 0.06
740-779
271 208 i 141 . W 0.02 0.03 0.05 10.10
780-819
157 105 0.05 0.09
narAMcB From RaoigrEB op Opposttb Wall 19-21(22-24 25-27 28-30 Sl-^(35-39(40-49 50-59
820-859 860-899
254 173 115 0.02 0.04 0.08
278 190 126 0.02 0.04 Q.08
190-209 210-229 230-249
270-299 300-339
0.02
38 29 0.05 0.08
19 0.16
60 45 35 28 0.03 0.04 0.06 0.10
71 64 0.02 0.04
34 28 22 0.08 0.11 0.17
84 0.02
63 0.03
49 0.05
40 0.07
32 0.10
25 0.16
100 0.02
48 38 80 0.04 0.06 0.09 0.13
73 0.04
37 0.11
900-939 940-479 980-1019 1020-1059 1060-1099 1100-1139
304 207 0.02 0.04
226 0.08
163 0.06
390 265 177 127 0.02 0.03 0.06 0.11
285 190 137 0.03 0.06 0.10
307 204 147 0.03 0.05 0.09
340-379 280-419 420-459 450-499 600-539 540-679 680-619 620-659
--;----------- -
123 95 78 61 47 88 0.02 0.03 0.04 0.06 0.09 0.18
117 0.03
75 58 89 0.05 0.08 0.15
1140-1179 1180-1219
142 113 91 70 47 0.02 0.03 0.04 .0.06 0.13
1220-1259
135 108
56
0.03 0.04 0.06 0.11
1260-1299
159 0.02
97 66 0.06 0.10
1300-1339
185 147 113 77 0.02 0.03 0.04 0.08
1340-1379
212 0.02
169 0.03
192 0.02
130 0.04
147 0.03
51
o:is
.100
0.07 0.15
1380-1419 1420-1459
217 0.02
113 > 75 0.06 0.13
AB
1460-1500
0.02
353 0.02
376 251 0.02 0.04
401 267 192 136 0.02 0.04 0.07 0.13
426 284 204 144 0.03 0.04 0.07 0.13
301 217 154 109 0.04 0.06 0.13 0.22
479 319 230
116
0.02 0.04 0.06 0.12 0.21
508 0.02
244 172 122 0.06 0.11 0.20
538 358 258 182 129.. 0.02 0.03 0.06 0.10 0.19
^ A' B'
, x.___...
K-aed on distance from register to opposite wall is unsatisfactory onaccount of sire or presuro
If register selectedbaaed on^
to obtain a more suitable register. If require-
placeX one and divide CFM capacity between the two registers.
TM FLATUS ADJUSTABLE BAR TYPE and do NOT include stackhead.
vSJ^n^Se riht^f Une^nd A* should not be used in applications such as church*, auditoriums, and oon-
eCr*d*Values on right of Une B and B' should not be used in applications such as residential work, motion Picture the*-
ten, court rooms and ochoola.
CFM X 1*4
For floor and baseboard registerswhere a velocity of approximately 300 FPM is used, the free area = m
nuu
...