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I'm looking for as quiet a range hood as I can find. We need 500+ CFM and are looking for a wall mounted stainless "funnel".
I'd love to hear recommendations, or links to some real reviews/informational sites.
Keep in mind that a large component of a hood's noise is the ductwork. The duct that goes from the hood to the outside of the house needs to be 8" or 10" diameter. If your duct is too small for your hood's cfms, you will have a noisy hood even if the hood is billed to be the quietest hood in the universe.
In addition, people have unrealistic expectations of hood noise. It is a motor, hung near head height. It is going to be noisy. Think about your bathroom exhaust fan. Those are typically 85-100 cfms. How noisy is it? Your kitchen hood will be about 5x those cfms.
For the quietest hood, you would need to install a "remote blower". That is where the motor is mounted on the home's roof, rather than directly at head height. It is expensive.
Except for bearing noise in the blower fan motor, most hood system noise is due to air turbulence. Turbulence sources include the fast-moving fan blade tips, the baffles, ducts, and hood internal transitions. The dominant noise is usually the blade--tip turbulence, so it helps to move the fan to the exterior of the house, so long as the duct is fairly long. Further improvement, and perhaps the most important in this simple configuration, is adding a silencer to the duct path between hood and blower.
No manufacturer is likely to build baffle shapes that are low noise unless a simple effective shape is discovered that also performs its function of centrifugal collection of grease particulates. In other words, no NACA air foil shapes will be provided.
It is possible with an external or in-line blower to choose a more powerful model and run it slower. This may preclude the need for a silencer.
A well configured but still residential grade system can reduce noise to baffle hiss at a conversational level, given that the air flow velocity over the area of the hood entry aperture meets containment requirements.
Vent-A-Hood vs Kobe range hood
Under cabinet hood or range hood ??
remove Over the range Microwave and but nice range hood
range hood 30" ducted allure series under cabinet range hood
Think about your bathroom exhaust fan. Those are typically 85-100 cfms. How noisy is it?
Not a good example... Our Panasonic bathroom fans are so quiet I often have a hard time telling whether they are running.
On the other hand, there is absolutely no doubt whether the kitchen vent hood is running. We did the best we could with keeping noise levels low. But the particular constraints of our building precluded things such as a remote blower or a silencer. So, we just have to live with the noise.
My favorite hoods are by Vent-a-Hood. I have used them on many projects. Here is the link to the specs regarding their efficiency and noise level. https://www.ventahood.com/index.php/about/innovation/magic-lung
Except Vent-A-Hoods are a PITA to clean. Make sure if you are considering that brand that you go someplace where they are on display, and ask to see how they are taken apart for cleaning. It’s not like just pulling out your hood’s baffle filters and sticking them in the dishwasher.
We have a Vent A Hood, and don’t find it a pain to clean. And, it’s much, much quieter than a baffle hood. It does a great job. Also, the way Vent A Hoods are constructed, you can go with fewer CFMs than other hoods, which affects how much make up air you’ll need.
M...we also have Panasonic bathroom fans, and find them extremely quiet, and powerful.
Back to the Vent A Hood...ours is vented externally, which helps greatly with the noise factor.
darbuka wrote, in part: "Also, the way Vent A Hoods are constructed, you can go with fewer CFMs than other hoods, which affects how much make up air you’ll need."
I would argue that this statement is misleading, at best. For adequate containment within the capture volume, the air flow velocity has to be sufficient to entrain the uprising cooking plumes and assure no spillage out of the hood. Although actual measurements of plume behavior with VaH hoods seems to be lacking in the kitchen ventilation data base, I see no reason why the achieved air flow volumetric rate and hence air velocity can be lower for the VaH hoods. I can imagine plume reflection effects in the VaH hood structure that might call for more velocity due to not having the baffle barrier to help trap the effluent once entrained.
This implies that the achieved make-up air volumetric flow rate has to be the same for either system configuration, because the only mitigating factor -- the same for either case -- is house air leakage. And this will be small if the house air pressure is kept near that outside to assure safety.
Where VaH shines (so to speak) flow-wise, is that it operates without baffles, and hence the blower sees less of a pressure drop due to baffles. When MUA is sufficient, and the duct length is short and adequate in diameter, the zero static pressure flow rating of the VaH blower can be lower than that of a conventional blower with baffles. This difference, I believe, is where the "equivalent" flow rate value that VaH touts comes from. However, given restrictive MUA, or worse than minimal duct losses, the squirrel-cage VaH blower loses performance faster than typical conventional blowers, so VaH hoods should be treated as having the performance their fan curve data specifies and not some comparative number when evaluating a specific configuration of hood, ducts, and MUA system.
And a comment about what the OP needs: Strive for an actual flow rate of 90 CFM per square foot of hood entry aperture. This requires that the ordinate point on the fan curve corresponding to where the area times 90 value is located on the abscissa, be greater than or equal to the total pressure loss of moving air from outside to the kitchen, through the hood, and back outside. It can be easy with filtered passive MUA for the pressure loss to exceed that of baffles; in such cases VaH loses its advantage.
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