7
SC-TSL (07-23) REV-0
Clearances
Clearance to combustibles is defined as the minimum distance—from the heater to a surface or object—that is
necessary to ensure that a surface temperature of 90°F (50°C) above the surrounding ambient temperature is not
exceeded. For safety and convenience, ensure that clearances are as follows:
Type
Unit Size
100 125 150, 175 200, 225 250, 300 350 400
Net Weight (Pounds (kg))
Unit 158 (72) 178 (81) 203 (92) 283 (128) 321 (146) 350 (159) 410 (186)
Shipping 184 (83) 204 (93) 244 (111) 314 (142) 354 (161) 384 (174) 447 (203)
Weights
Unit Surface Minimum Clearance (Inches (mm))
Top 6 (152)
Control side 6 (152) + width of unit
Side opposite controls 6 (152)
Bottom, to combustibles 6 (152)
Bottom, to noncombustibles 0 (0)
Duct Furnace Airflow
The duct furnace must be installed on the positive pressure side of the field-supplied blower. 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. To determine temperature rise, the inlet and outlet air temperatures should be measured at points not
affected by heat radiating from the heat exchanger. Refer to the following table section for the approved temperature
rise range with the required CFM and the internal pressure drop for each size of unit. Refer to the installation manual
for suggested blower connections that include turning vanes used in elbows or turns in the air inlet to ensure proper
air distribution. If it is determined that the blower CFM is greater than that which is allowed or desirable, refer to the
installation manual for instructions on determining the correct size of bypass duct required.
Temp-
erature
Rise
Unit Size
100 125 150 175 200 225 250 300 350 400
CFM/Pressure Drop (IN WC)
80% Thermal Efficient
50°F
1480/0.50 1850/0.50 2220/0.36 2590/0.52 2960/0.41 3330/0.53 3700/0.42 4440/0.58 5185/0.67 5925/0.67
55°F 1345/0.34 1680/0.41 2020/0.30 2355/0.43 2690/0.34 3030/0.44 3365/0.35 4040/0.48 4710/0.55 5385/0.55
60°F 1235/0.29 1540/0.34 1850/0.26 2160/0.36 2465/0.28 2775/0.37 3085/0.30 3700/0.40 4320/0.46 4935/0.46
70°F 1055/0.21 1320/0.25 1585/0.19 1850/0.26 2115/0.21 2380/0.27 2645/0.22 3175/0.30 3700/0.34 4230/0.34
80°F 925/0.16 1155/0.19 1385/0.14 1620/0.20 1850/0.17 2080/0.21 2315/0.20 2775/0.23 3240/0.26 3700/0.26
85°F 870/0.14 1085/0.18 1305/0.13 1525/0.18 1740/0.15 1960/0.19 2175/0.20 2610/0.22 3050/0.23 3485/0.23
90°F 820/0.12 1025/0.16 1235/0.12 1440/0.16 1645/0.13 1850/0.17 2055/0.18 2465/0.20 2880/0.21 3290/0.21
With Finger Baffles Removed
20°F 3700/1.08 4630/1.12 5555/0.85 6480/1.11 7405/1.02 8330/1.24 9255/0.90 11,110/1.24 12,960/1.24 14,815/1.24
30°F 2465/0.48 3085/0.50 3700/0.38 4320/0.50 4935/0.45 5555/0.55 6170/0.40 7405/0.55 8640/0.55 9875/0.55
40°F 1850/0.27 2315/0.28 2775/0.21 3240/0.28 3700/0.25 4165/0.31 4630/0.22 5555/0.31 6480/0.31 7405/0.31
50°F 1480/0.17 1850/0.18 2220/0.14 2590/0.18 2960/0.16 3330/0.20 3700/0.14 4440/0.20 5185/0.20 5925/0.20
60°F 1230/0.13 1540/0.13 1850/0.11 2160/0.14 2465/0.12 2775/0.15 3085/0.11 3700/0.15 4320/0.15 4935/0.15
70°F 1055/0.10 1320/0.11 1585/0.10 1850/0.13 2115/0.10 2380/0.11 2645/0.09 3170/0.11 3700/0.11 4230/0.11
75°F 985/0.09 1230/0.10 1480/0.09 1725/0.11 1975/0.09 2220/0.10 2465/0.08 2960/0.10 3455/0.10 3950/0.10
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