CMF for current furnace?


Old 11-18-01, 05:44 AM
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Question CMF for current furnace?

I'm trying to determine the current CMF for my existing furnace to determine proper duct sizes for my basement project. I'm using the HVAC-Calc program ( which requires the CMF for my furnace. My home is about 4 years old and the builder installed a Trane Furnace model number TUE100A948. The "Service Facts" document provided with the furnace states this furnace is rated at 100,000 BTUH (input) & 79,000 (output).

This document also included 2 CMF charts which I'm not sure how to read.

The first one states the "CMF vs. External Static Pressure (in W.C)"

The second one states "CMF vs. Temperature Rise"

Can someone please tell me how to read these charts to determine the CMF for my furnace?
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Old 11-27-01, 10:17 PM
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The furnace that you have has a 4 ton blower(1600 cfm)

It is safe to use a .5 static pressure for your calculations.

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