Installation guide
Table 5---Air Delivery - CFM (with Filter)* (Continued)
FURNACE RETURN-AIR SPEED EXTERNAL STATIC PRESSURE (In. W.C.)
SIZE iNLET 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
135-16/ Bottom or High 2065 2000 1930 1835 1710 1590 1420 1235 1025 835
048135 Side(s) Med - High 1790 1755 1705 1640 1550 1465 1295 1145 945 775
Med - Low 1480 1480 1480 1450 1380 1295 1160 1005 855 670
High 2445 2365 2280 2190 2085 1980 1850 1705 1520 1355
Bottom Only Med - High 2130 2080 2025 1960 1880 1795 1690 1550 1405 1255
Med - Low 1860 1830 1800 1755 1705 1630 1530 1415 1280 1140
Bottom, Sides High .... 2355 2280 2160 2065 1930 1805 1655 1465
135-22/
066135 or 1 Side & Bot- Med-High 2120 2075 1995 1970 1905 1835 1735 1645 1515 1325
tom Med - Low 1860 1830 1800 1755 1725 1630 1530 1415 1280 1140
High .... 2215 2130 2030 1920 1795 1675 1540 1385
1 Side Only Med-High 2070 2015 1970 1935 1855 1765 1655 1550 1445 1265
Med - Low 1860 1830 1800 1755 1725 1630 1530 1415 1280 1140
High 2465 2430 2375 2305 2215 2110 2000 1865 1715 1530
Bottom Only Med - High 2115 2095 2055 2005 1940 1845 1820 1675 1525 1390
Med - Low 1800 1790 1770 1735 1695 1640 1570 1465 1345 1225
155-20/ Both Sides Or 1 High .... 2375 2285 2185 2105 1995 1870 1720 1555
060155 Side & Bottom Med-High 2155 2125 2075 2015 1935 1830 1780 1635 1485 1365
Med - Low 1800 1790 1770 1735 1695 1640 1570 1465 1345 1225
High .... 2260 2180 2070 1975 1865 1740 1595 1440
1Side Only Med - High 2140 2085 2020 1950 1850 1745 1695 1545 1415 1290
Med - Low 1800 1790 1770 1735 1695 1640 1570 1465 1345 1225
A filter is required for each return-air inlet. Airflow performance included 3/4-in. (19 mm) washable filter media such as contained in factory-authorized ac-
cessory filter rack. To determine airflow performance without this filter, assume an additional 0.1 In. W.C. available external static pressure.
-- Indicates unstable operating conditions.
U PFLOW DOWN FLOW HO REZO NTAL
YES
YES
[......
YES
\
120°_
MIN
/\ /\
YES 120°_ YES 120°_ YES
MIN MIN
NO NO NO
Fig. 14 - Duct Flanges
A02020
15