Under cabinet hood options for 20" upper? 36" Bluestar range and
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2 years ago
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Which Vent-a-Hood under cabinet model for above 30' Bluestar
Comments (11)http://www.ventahood.com/images/docs/fxr9%20under%20cabinet%20range%20hood%20specifications.pdf Both fori and heimert make a good point. Most people talking about VAH over Bluestars are interested in major smoke ejecting. The undercabinet ones are of a tamer depth 19-21 from my quick look. I chimed in because I am about to buy a 30x27 inch deep hood (probably out of consumer-gotta-have-it paranoia) for a small bluestar--everyboody seems to say go for the coverage if one can afford the space for the extra canopy which actually does make functional sense especially if you are in an apt. space as I am. (I'm definitely not adding anything new here, but trying to save you having to pick through all the venting threads)...See MoreHood & Venting for Bluestar Rangetop...Zephyr or Bluestar?
Comments (32)There are a few sources of noise in a hood ventilation system (and potentially also in a powered make-up air system). The dominant noise when a silencer isn't or can't be used is fan blade tip turbulence noise. Second will be either baffle turbulence noise (more like a hiss), or its counterpart if mesh filtering is used, or duct turbulence noise. Baffle noise domination assumes that the duct is damped on the outside and the air velocity in the duct is not too high. Otherwise duct turbulence noise may dominate baffle noise, and the duct may also rattle passing on blower unbalance vibration noises. External blower noise is usually lower with a long duct than with a short duct, but one should not expect a really big reduction in noise just because the blower is outside instead of in the hood (for equal volumetric flow rate). (The exception would be a commercial external blower, configured deliberately so that the fan is oversized and the belt drive sheaf ratio is set for a slower tip speed.) For residential operation, where room for a silencer is available, an external roof blower and inline silencer is the quieter approach, leaving baffle hiss below normal speaking levels at full power. That is my configuration. Part of the duct turbulence noise will also be removed -- that from the duct between the silencer and the external blower. Fantech silencers are larger than the ducts, e.g., 14 inches in diameter for a 10-inch duct. http://www.fantech.net/products/fans--accessories/accessories-ventilation/silencers/ld/ld-10-silencer/ They have the general appearance of a motorcycle muffler scaled to a dragline excavator engine. The silencers are also somewhat longish, so if the duct was going to go up into an attic and straight to the roof at the roof edge, it would be necessary to use an angle duct after entering the attic to extend the duct length in the attic to accommodate the silencer, thence use another angle to bring the duct to the roof. Avoid horizontal ducting if possible. Try to make the ducting accessible if possible....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 MoreRange Hood (Zephr Typhoon Under Cabinet) - Ducting & Noise
Comments (17)When moisture and grease particulate laden air flows through a duct, there is turbulence and these two components will be brought in contact with the duct wall. Slow moving air will allow condensation; fast moving air will allow impingement collection. In general, both likely happen at different ratios depending on temperature and fan setting. I wouldn't change a duct diameter just for this reason. What you have for a hood is unconventional. Commercial hoods and "pro" residential hoods use baffles that cause two 180-degree turns in the air flow. The larger grease particulates are deliberately impinged on the baffle surfaces, and given some baffle angle will drain toward a collection point. Even without angle, the grease is trapped where it can't easily drip down onto the cooktop. I don't know the details of this fan scheme, so I won't comment on what it might be doing with grease. When you initially wrote that you were having the hood installed, I didn't bother with commenting on its design -- sorry. Whether grease dripping from the fan grid was intended or not I cannot say, but it likely is consistent with the physics of the hood design. Again let me pontificate for this forum that the farther a residential hood deviates from long-time optimized commercial hood design, some portion of performance and efficiency will be lost. Running the fans for a minute before generating any greasy effluent might help with condensation, but I think the fan blades here are causing grease collection around the grill as well as wherever it is supposed to collect....See Morekaseki
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