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Old 10-16-2012, 12:42 PM   #1
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Up dating duct work


Hi: I am currently replacing my old furnance with a new high efficency furnance. When I opened up the wall to expose the old duct work I noticed that their are 2 4" pipes supplying 1 special made boot in the living area. The house is sitting on a concrete slab so there is not much room. My question is can I have the 2 4" pipes go into a 8" oblong or round to elimate the extra space on the plenium. I am not handy with duct work, and the experts I call in can not figure out my problem either. Old house with bad ducts all around. Any help would be greatly appreciated. Thank you

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Old 10-17-2012, 12:39 PM   #2
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Up dating duct work


Hi Mr Ed. You mention that the ducts in your house are of poor quality. If they haven't been repaired in a while, it's likely that they're leaking or restricting airflow, thus wasting energy and raising your utility bills. This could cancel out the benefits of your new high-efficiency furnace. It might be a good idea to replace your ducts completely rather than seal them inside of another pipe.

Here are some resources about ductwork and HVAC efficiency:
The Engineering Toolbox: Sizing Ducts
Energy Star Duct Sealing
SBA Tips for Energy Efficiency (for small businesses, but the advice is still applicable)
furnacecompare.com: HVAC Ductwork

Have an expert inspect the ductwork for you. There is a good checklist on how to find a good HVAC contractor on pages 18-19 of this document: A Guide to Energy-Efficient Heating and Cooling.

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Old 10-17-2012, 07:35 PM   #3
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Up dating duct work


Posting a pic of your plenum and those pipes may help us help you.
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