Ceiling Return Addition Question - HVAC - DIY Chatroom Home Improvement Forum

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Old 07-28-2014, 04:21 PM   #1
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Ceiling return addition question

Last year I added an 8 inch flex duct ceiling mounted return in my sons den. Want to add another in the formal living area in the room next to this den.

As I stated this was a simple 8" flex back to the return for the den. Can I add another ceiling return in the adjacent living room and use a 8x8x8 wye to connect them all together?

If I dont upsize the main line back to the return air plenum, will I loose much return?


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Old 07-28-2014, 08:29 PM   #2
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You;ll reduce the amount of return the first one has.

Best to increase the line back to the furnace/A/C to 10".


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