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Old 11-29-2010, 03:18 PM   #1
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modify return trunk


I want to finish part of my basement. i want to sheetrock the ceiling. But there is a return trunk (?) in the way. As you can see in the pics, below the return is a 14" by 36" sections that go perpendicular to the floor joists. so i want to remove that , seal it up and sheet rock over it. But, i think i need to make for the air space i am removing. can i just extend the trunk down(hvac3 pic) the joist cavity about 40" to make up the lost space?????

any ideas/tips would be appreciated. i am not an hvac person.
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modify return trunk-hvac1.jpg   modify return trunk-hvac2.jpg   modify return trunk-hvac3.jpg  

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Old 11-29-2010, 05:47 PM   #2
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modify return trunk


Thats a jumper duct. It is helping the air from the one joist space get to the other joist space. So you need it. Would moving it back closer to the beam be possible.

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Old 11-29-2010, 08:15 PM   #3
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modify return trunk


so its called a "jumper duct", never used that term in my 50 years. So, moving it back, would help, but only a little, I could move it back about 10 inches. It "appears" that my HVAC guy used the jumper duct because he couldn't connect to the main return trunk, because there is "solid blocking", located over the microlam beam, the other joist cavity is wide open to the main return. can i replace the solid blocking with some other type of support?


any other options??

thanks
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Old 11-30-2010, 04:30 AM   #4
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modify return trunk


Need to check with your local code department if they allow the solid blocking to be removed and replaced with another form of blocking/support.

"Jumper", and "Transfer" are the 2 most common names that I know of for that duct.
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