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Old 04-17-2011, 12:37 PM   #1
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Raising a suspended heat duct


I'm considering raising the heat duct in my basement that runs about 20 feet along the basement ceiling. While the return air duct is flush up against the joists, the heating duct is suspended about 2 inches lower. I figure they may have originally done this to make space for plumbing, but it turns out that there is nothing blocking the whole run from being lifted and secured flush.

I am trying to determine how complex this will be, as I figure this may require an HVAC pro to make the modification if it is possible. My goal in doing this is to level it up with the return duct and the middle beam of the house, mainly for aesthetic purposes as I plan on finishing the basement.

Here's a picture of where the duct meets the furnace. Along the top of the duct, there are vents between the joists that run the heat up into the house. For the ones I can see clearly, it appears that there is clearance for them to be raised as well.

Let me know if you've ever tried doing this and any complications that would make this an extensive project. Thanks!

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Here's an additional image showing the length of the duct.

Last edited by dmarek; 04-17-2011 at 12:42 PM. Reason: adding another image
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Old 04-17-2011, 12:45 PM   #2
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Raising a suspended heat duct


code says it needs to be 1" from combustibles. also it needs to have room to expand and contract with changes in temp from the furnace which will go from 70-140 deg F or more on some units. put it tight on the joists and it will bing/bong/boing all nite and you will be sorry.

most people just box them in and cover with sheetrock or suspended ceiling tiles.
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Last edited by yuri; 04-17-2011 at 12:48 PM.
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Old 04-17-2011, 04:57 PM   #3
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Raising a suspended heat duct


Those are 2 very good reasons to leave it alone! Thank you.
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