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duct size / boot / grill question

Posted by andrelaplume2 (My Page) on
Thu, Jul 12, 12 at 22:59

Ok, its a basement. We had our ac replaced a few years back and had them run a few ducts. We do not expect it to make a huge differnece...we knew that going in...the one duct is right above a seating area though and in the winter is seams to make some difference.

So I put up my grid for my suspended ceiling and got all my cans where I wnated them and got everything wired up. I was just about to start putting tiles in when I realized I forgot about the duct! Of course its between two joists but a grid pretty much runs parrelell to the joists almost splitting it. Bottom line, I have a 6" round steel duct with about 2' of plastic flex coming off it sandwhiched in an area about 8" wide. I have no idea what to do about a boot grill and how to attach it.

The one thing mentioned was a 6" circle diffuser attached to the flex duct, resting on the ceiling tile with the grill attached the ceiling tile. Simple enough BUT...Is this size grill big enough? I see 6 x 10 boots, 6 x 12 boots etc etc...those are all bigger than a 6" round diffuser/grill. Is this just cosmetic or does it make a difference what size the boot / grill is?

Follow-Up Postings:

RE: duct size / boot / grill question

narrowed it down to two options...

1) have the 6" duct drop down over backside of 2 x 2 ceiling tile into 6" round diffuser. Diffuser thru tile. Th e6" grill thru front of tile into diffuser. So I end up with a 6" round grill.

2) By a boot that id 10 X 6 but with the 6" opening for the duct facing the short (6") side. This will fit my space. I'd have to fashion 2 hangers out of 2 x 2s and attach the boot to the 2x2s suspended on the grid system. The 2 x 2s would also offer something to screw th 10 x 6 grill into.

Atshestics aside...what is the difference in air flow / comfort between a 6" round and 10 x 6 grill?

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