Hood & venting question for a Bluestar on an interior wall.
maire_cate
7 years ago
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Hood / Microwave Exhaust Vent, Wall question
Comments (1)"how can I run the ductwork up through the top plates while maintaining the integrity of the wall?? " You probably cannot. You have a couple of options. You can extend the natural 3-1/2x10 vent outlet straight up above the top plate, 45 into the attic. Or, if in fact the wall is 2x6, remove from the center of the width of top plates that corresponds with an adjacent clear, unobstructed stud bay, remove the back of the cabinet and the wall material of the selected stud bay. 3-1/2x10 vent material is available or can be fabricated to meet these configurations....See MoreRange hood venting on interior wall
Comments (4)Hiding the duct between joists is only going to work if the joists run in the right direction AND if the space is not occupied by other ducts, wires or pipes, and if the joist spacing is amenable to the hook-up. Like the other responder said, if you're filling in the above-cabinet gap already, then you have some space to play with to make the ducting work. Soffits don't have to be eyesores: Mine hide the 10" duct for my ventilator, and some stray pipes and wires. Finished: Casey...See MoreBlueStar vs. Wolf Vent Hood
Comments (21)It is worth pointing out, I think, that the pressure differential across the blower, called pressure loss, is essentially the same whether the blower is in the hood, at the end of the duct outside, or in a door blowing into an otherwise sealed house. The pressure loss is the sum of all the losses due to friction and turbulence in the duct, duct cap where present, hood transitions, baffles, make-up air system restrictions, etc. Any slight differences in pressure loss with blower position will be due to local transitions where the blower is mounted versus the blower's air flow uniformity at the blower exit. The resulting flow rate will be that which applies to that pressure loss on the fan curve plot. Front of hood deposited grease is due to insufficient overlap and/or insufficient air velocity at the hood aperture. Hoods are generally poor at drawing air from the vicinity of the burners. Most plume capture depends on the plume's upward velocity, mainly driven by the buoyancy of hot grease and water vapor and air. The plume naturally expands as it rises, hence hood aperture overlap is desirable....See More48" Bluestar Platinum Range Top on Island - Vent-A-Hood question
Comments (7)Not only should the hood sides overlap the range cooktop, (60 inches may do vs. 48 for the range), but similarly the front-to-back aperture distance must be sufficient to overlap the range cooktop. The VaH drawing shows 30 inches, perhaps enough, although it is unclear how much of that might be lip or controls. Assume none. With an entrance aperture of 30 x 60 or 12.5 sq. ft. under the hood, at 90 CFM per sq. ft. the actual flow should be 1100 CFM -- probably adequate even on an island -- so long as there are no significant cross drafts. However, a magic lung isn't magic. The most we can generously assume is that the hood hanging in the air can flow the rated 1100 CFM. What it can do with some length of ducting, a roof cap, and a make-up air system imperfectly attempting to make the interior air pressure to outside air pressure equal is not knowable without analysis. I would go for a higher flow rate, ca. 1700 CFM. With care and expense, maybe 1500 would scrape by, particularly at 30-inches height, where the hood may block the view of taller cooks. A side view stick figure mock-up is recommended. Also, I am unclear how effective the entire entry aperture is, without more detail about how the incoming air meets the blowers and how the blower structure interacts with it. Pro style baffle type hoods are, in their way, somewhat less complex internally if the blower is moved to the roof where it belongs....See Moremaire_cate
7 years agolast modified: 7 years agomaire_cate
7 years agomaire_cate
7 years agomaire_cate
7 years agolast modified: 7 years agomaire_cate
7 years agolast modified: 7 years agomaire_cate
7 years ago
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