The plan:
Island hood 1000cfm 6inch round duct With 2 x45 angles at 15 ft run.
OTR microwave 450cfm 2-3/4 x 10 duct (equivalent 7inch round) run 6 feet at 2-3/4 x 10 then 1 foot at 6inch round With 2 x 90 degree angles in 2 3/4.
Both connect to a 8x6x6 wye to exit though wall cap. Straight 2 feet.
The reasoning:
6 inch from hood as that is the spec.
2-3/4 x 10 from otr as spec.
2-3/4 x 10 to 6 inch to fit the wye.
8 inch out because 6inch and 2-3/4 x 10 in square inches are roughly equivilent to 8inch.
Wall cap because I prefer it.
Issues:
I know nothing about static pressure And am unsure if 8 inch is neccisary for the final short run.
I live in climate zone 7 and will need to insulate the galvanized Some how.
High velocity on the hood may hold OTR damper closed, this wye is designed to minimize this effect.
Other things:
Back draft dampers. I can not find local suppliers even though these seem incredibly important. Is there a code reason I cant find these in Saskatchewan? Amazon.ca has a few.
The attic is insulated at the roofline.
Makeup air will be addressed seperate from this post please.
Other yhings I missed.
Island hood 1000cfm 6inch round duct With 2 x45 angles at 15 ft run.
OTR microwave 450cfm 2-3/4 x 10 duct (equivalent 7inch round) run 6 feet at 2-3/4 x 10 then 1 foot at 6inch round With 2 x 90 degree angles in 2 3/4.
Both connect to a 8x6x6 wye to exit though wall cap. Straight 2 feet.
The reasoning:
6 inch from hood as that is the spec.
2-3/4 x 10 from otr as spec.
2-3/4 x 10 to 6 inch to fit the wye.
8 inch out because 6inch and 2-3/4 x 10 in square inches are roughly equivilent to 8inch.
Wall cap because I prefer it.
Issues:
I know nothing about static pressure And am unsure if 8 inch is neccisary for the final short run.
I live in climate zone 7 and will need to insulate the galvanized Some how.
High velocity on the hood may hold OTR damper closed, this wye is designed to minimize this effect.
Other things:
Back draft dampers. I can not find local suppliers even though these seem incredibly important. Is there a code reason I cant find these in Saskatchewan? Amazon.ca has a few.
The attic is insulated at the roofline.
Makeup air will be addressed seperate from this post please.
Other yhings I missed.
dual exhaust fans, single exit cap
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