Our 590cfm 36" range hood is on a downstairs interior wall which can't vent up (the wall is a pony wall on the second floor). When the home was originally constructed, the builder instead put a 180 degree elbow and vented downward between the studs to the crawl space, and from there out to the side of the house. We've never had very good pull through the hood, and now that we want to get a higher-end cooktop it's time to somehow fix this.
I can think of two options, but I'm looking for suggestions/opinions: 1. Continue to vent down-and-out through the crawl space with these changes: - Increase the size of the ducting (I think it's only a 10" oval between the studs, and a 6" round through the crawl space). It's easy to get to the vents since we're redoing part of the kitchen and the wall backs to a pantry, so no big worries pulling out a section of drywall there. - Switch to an inline blower in the crawl space to pull rather than push the air, and (somehow) modify or replace the hood with one that vents directly to the rear to eliminate the 180 degree turn above.
- Scrap the existing ducting, and run a new 10" round duct upward to the ceiling and horizontally to the outside between the ceiling joists (the joists are engineered wood, about 12" high). I think we have a fairly clear path to the front of the house, probably 30 feet through a dining room and a garage. How hard is it to retrofit ductwork without tearing out the ceiling drywall?
Thanks for any advice.
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