Installation Guide

16
I&O manual
Table 2 - Air Delivery - CFM (Without Filter) * @ & #
* A filter is required for each return -air Inlet. Airflow performance Included 3/4-ln. (19 mm) washable filter media such as contained
In factory-authorized accessory filter rack. To determine airflow performance with this filter, assume an additional 0.1 in. wc available
external static pressure.
@ Manufacturer default speed tap for HIGH FIRE heating.
& Manufacturer default speed tap for LOW FIRE heating.
# Tested at Max. external static pressure 0.5 in W.C.
Table 3 - Recommended Filter Sizes (High Velocity 600 FPM)
FURNACE CASING WIDTH
16X25
(406X635)
16X25
(406X635)
16X25
(406X635)
16X25
(406X635)
20X25
(508X635)
24X25
(610X635)
17-1/2(445)
21(533)
24.5(622)
FILTER SIZE
SIDE RETURN BOTTOM RETURN
FILTER TYPE
High Velocity (600 FPM)
High Velocity (600 FPM)
High Velocity (600 FPM)
NOTES:
1. Air velocity through throwaway type filters may not exceed 300 feet per minute (91.4 m/min). All velocities over this require the use of high
velocity filters.
2. Do not exceed 1800 CFM using a single side return and a 16x25 filter. For CFM greater than 1800, you may use two side returns or one side
and the bottom or one side return with a transition to allow use of a 20x25 filter.
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.
0
H 1460 1410 1340 1290 1230 1160 1090 1010 950 850
@ H-M 1270 1230 1180 1140 1080 1020 960 890 820 760
& M-L
@ H-M
& M-L
@ H-M
& M-L
@ H-M
& M-L
@ H-M
& M-L
@ H-M
& M-L
1090 1060 1030 990 950 900 860 810 750
L 810 780 750 725 700 660 620 580
H 1520 1260 1400 1330 1260 1220 1110 1020 930 840
1310 1260 1210 1150 1100 1030 960 890 810 750
1090 1050 1010 970 920 870 820 760
L 830 800 770 740 710 670 630 590
H 1850 1790 1730 1660 1600 1520 1450 1370 1290 1200
1570 1530 1480 1420 1350 1300 1230 1160 1080 980
1400 1350 1300 1260 1200 1150 1070 1010 930 860
L 1230 1190 1150 1100 1070 1010 950 890 840 770
H 2030 1970 1910 1850 1780 1720 1630 1550 1470 1380
1790 1730 1680 1620 1550 1490 1410 1330 1250 1140
1640 1600 1560 1520 1460 1420 1360 1300 1220 1130
L 1480 1440 1400 1360 1330 1290 1230 1170 1100 1010
H 2190 2110 2060 2000 1940 1870 1800 1730 1650 1570
1850 1815 1800 1750 1715 1660 1600 1530 1470 1390
1660 1640 1610 1580 1540 1500 1450 1400 1330 1260
L 1490 1470 1430 1420 1380 1350 1310 1260 1200 1130
H 2190 2120 2070 2010 1940 1880 1810 1730 1650 1560
1850 1820 1780 1740 1690 1630 1570 1510 1430 1330
1680 1655 1610 1590 1550 1510 1460 1400 1340 1210
L 1500 1460 1430 1400 1360 1320 1280 1220 1160 1090
100D Bottom or Sides
120D Bottom or Sides
80B Bottom or Sides
80C Bottom or Sides
100C Bottom or Sides
EXTERNAL STATIC PRESSURE (IN.WC)
SPEE
D
RETURN-AIR
INLET
FURNACE
SIZE
Bottom or Sides 60B
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