CMF for current furnace?

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  #1  
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 (www.hvaccomputer.com) 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)"

http://home.earthlink.net/~balcells/cmf1.jpg

The second one states "CMF vs. Temperature Rise"

http://home.earthlink.net/~balcells/cmf2.jpg

Can someone please tell me how to read these charts to determine the CMF for my furnace?
 
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  #2  
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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