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Old 03-01-2013, 09:35 AM   #16
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Single return box goes to two rooms, no privacy


not an expert here... but it looks like a 16 inch flex will allow 975 cfm at .1 static pressure and it looks like an 8 inch flex will allow about 175 cfm at .1 static pressure. so by adding the 8 inch flex return to to the bedroom, you should be decreasing the static pressure in your system.
but since you are taking out a return grill on the 16 inch return, you might end up with some pretty fast air flow at the grill, which might make some noise. i dont know where your filter is,, but if its in the grill, you might be jumping up the fpm on the 16 inch return filter. if the filter is at the air handler, you should be fine.

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Old 03-01-2013, 09:55 AM   #17
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Single return box goes to two rooms, no privacy


thanks again. yes, the filters will be in both grills. So if the noise is not an issue (in hallway) is this okay for my system to reduce the static pressure as described?
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Old 03-01-2013, 03:57 PM   #18
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Single return box goes to two rooms, no privacy


How many supplies in bedroom, and what size are they,.
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Old 03-01-2013, 05:00 PM   #19
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Single return box goes to two rooms, no privacy


two and they are the standard small floor ones.. ~11x4 .. there is also one in the bathroom attached. Thanks.
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Old 03-01-2013, 06:32 PM   #20
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Single return box goes to two rooms, no privacy


Why not install a thin solid divider (such as thin plywood) vertically directly over the middle of the round duct below?

Cut a hole in the existing rectangular duct, directly above the existing round duct, to add more ductwork to extend the return ducting to other locations as desired.
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Last edited by AllanJ; 03-01-2013 at 06:42 PM.
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Old 03-01-2013, 06:37 PM   #21
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Single return box goes to two rooms, no privacy


You need to return as much air as you supply.
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Old 03-02-2013, 09:00 AM   #22
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Single return box goes to two rooms, no privacy


Thanks Alan. I am moving the whole thing forward further under the stairs to enlarge the closet.

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