Piggy-backing Cold Air Returns?

Old 04-29-03, 05:55 AM
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Piggy-backing Cold Air Returns?

Is it ok to tie into an existing cold air return branch to put in new cold air returns for my basement finish?

There are two spots where existing cold air returns branches go right under interior walls and it'd be extremely easy to tie into them. Much easier than starting a new branch from the main cold air return intake.

I don't see a problem with it, as technically the branches are already branches off the main trunk, but I just wanted to verify it with all you experts out there.

Old 04-29-03, 05:40 PM
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the airflow will take the path of least resistance for the most part
Old 04-29-03, 08:22 PM
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no problem adding the extra return......just be sure the filter in your sytstem is in a place where all the return air passes. you may want to consider adding a damper to balance the return air. this will somewhat change the path of least resistance and allow more return air from your new return.. the damper should go in the old return duct before the spot that the new duct run is added. either way you want to be sure you do not decrease the amount of air being drawn back to your unit.

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