Evaporative Water Coolers - Installing roof ducting for swamp cooler

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syperk
07-06-07, 09:15 PM
I'm installing a swamp cooler on my roof and have got to the point where I need to make a hole in the roof in order to bring the air in. I'm using a side draft cooler, so I'll be getting a right angle duct fabricated to connect the cooler outlet to the ceiling diffuser.

The cooler outlet opening is 19 3/4" x 19 3/4" square, so presumably in an ideal world, this would also be the cross section of the duct work. However, the duct has to come down through my flat roof, which is framed with 2x10 joists at 16" o.c.. So either I'm going to have to reduce the width of the ducting on one side to about 14 1/2" in order to squeeze it between the joists, or I'm going to have to cut one joist and frame a 20"x20" opening. I don't mind doing that - though I think it means taking off more ceiling sheetrock than will be covered by the diffuser (so I can support the cut joist with joist hangers), necessitating some patching - but I wanted to check that this is standard practice before I do so...

Any thoughts?

Cheers,

Simon

mla2ofus
07-07-07, 03:52 PM
Why not just mount it in a window since it's a sidedraft???
Mike