Form I-X, P/N 150491 R7, Page 12
Model X - Pressure Drop Table for 80% Thermal Efcient Duct Furnace
Size 75 100 125 150 175 200 225 250 300 350 400
Temp
Rise
CFM P.D. CFM P.D. CFM P.D. CFM P.D. CFM P.D. CFM P.D. CFM P.D. CFM P.D. CFM P.D. CFM P.D. CFM P.D.
50°F 1105 0.2 1475 0.4 1840 0.5 2210 0.4 2580 0.5 2945 0.4 3315 0.5 3685 0.4 4420 0.6 5160 0.7 5895 0.7
60°F 920 0.2 1225 0.3 1535 0.3 1840 0.3 2150 0.4 2455 0.3 2765 0.4 3070 0.3 3685 0.4 4300 0.4 4915 0.5
70°F 790 0.1 1050 0.2 1315 0.3 1580 0.2 1840 0.3 2105 0.2 2370 0.3 2630 0.2 3160 0.3 3685 0.3 4210 0.3
80°F 690 0.1 920 0.2 1150 0.2 1380 0.2 1610 0.2 1840 0.2 2070 0.2 2300 0.2 2765 0.3 3225 0.3 3685 0.3
90°F 610 0.0 815 0.1 1020 0.2 1225 0.1 1430 0.2 1635 0.1 1840 0.2 2045 0.2 2455 0.2 2865 0.2 3275 0.2
The duct furnace must be installed on the positive pressure side of the eld supplied
blower. The air throughput must be within the CFM range stated on the heater rating
plate. The air distribution must be even over the entire heat exchanger. Turning vanes
should be used in elbows or turns in the air inlet to ensure proper air distribution (See
Paragraph 6.3.2).
If it is determined that the blower CFM is greater than allowed or desirable, see Para-
graph 6.3.3 for instructions on determining the correct size of bypass duct required or
see the APPENDIX, page 28, for instructions on converting the furnace for a higher
CFM application.
6.3.2 Duct Furnace
Blower Connections
6.0 Mechanical
(cont'd)
6.3 Duct Furnace Airow (cont'd)
FIGURE 11A - Straight
Through Air Blower
Connection
FIGURE 11B - With Elbows
Up or Down
FIGURE 11C - With Elbows
Right or Left
6.3.1 Pressure Drop and Temperature Rise by Size (cont'd)
Proper arrangements of blower and duct furnace with respect to angle of approach of
the duct connection and the arrangement of the discharge opening of the blower are
shown in FIGURES 11 A, B, and C. Blowers should be bottom horizontal discharge
when coupled to the duct furnace. If a top horizontal discharge blower is connected to
the duct furnace, be sure that sufcient length of duct is provided to permit even ow
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