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Old 02-01-2012, 04:44 PM   #1
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Dyna-trail furnace

I'm going to replace my suburban furnace. I'ts a model NT-30 M. It has four duct holes in the cabnet. The new Nt-16s and NT-20 s does not. The dimensions of the Old furnace and the new one are exactly the same. Height 9 1/2 width 9 3/8 depth 22 1/2. I'm wondering if anyone could tell me if the new furnace will fit into the old cabinet.
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Old 02-01-2012, 05:40 PM   #2
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It would probably fit, but very often the gas connections and the electrical connections are in a different place. Also the cooling slots for the ignitor board may not be present, or in a different location. Once you have the guts of the furnace out, generally there are only two screws that hold the cabinet in place so it is not a big additional effort to change it too. Also, the new one will have the proper labels and serial numbers, gas input etc on it, where as if you simply put the new guts in the old cabinet, most of the information on the old cabinet will be wrong for the next repair man who works on it.

The new cabinet has only two outlet holes as it has a lower heat output. If that is the reason for wanting to keep the old cabinet, I would either cut additional outlet holes in the new cabinet, or make a Y fitting to split the output from one to two ducts.
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Old 02-01-2012, 07:53 PM   #3
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dyna-trail furnace

Thanks for the information. I would like to keep the four holes if possible because of the space issues around the furnace. I would probably have to change wiring and gas line anyway. I will look into it some more and see if I can find one to have a look at it first before I order one.
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