wolf 48” in blower or remote blower hood vent
jrjunk
5 years ago
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remote vs. in-line blowers on kitchen vents
Comments (15)Actually hood ventilation noise consists primarily of two components - blower or blower mechanical noise and airflow noise (ignoring vibration caused from a cheap and poorly constructed hoods). A low quality blower will introduce mechanical noise hence one should always strive to install the best quality blower you can - each of those blower options below have specific areas of use - an inline blower mounted remotely will reduce immediate mechanical noise versus an internal blower in the hood HOWEVER an inline blower brings its own risks in terms of resonance (air waves from blower oscillations and minute vibrations) in a confined area. An external blower mounted close to the hood is about the same as an internal blower in the hood - one typically uses an external blower if you have a difficult duct run - sucking air from the end of the duct run along a convoluted and long duct run is far more efficient than trying to PUSH air from inside the hood via an internal blower along the same duct run. At the end of the day noise has mainly two components - poor quality blower that introduces excessive mechanical noise (there will always be some but this can be mitigated by using a good quality blower) and most importantly the QUALITY of the duct run - a duct run that is too small or multiple 90 elbows or has been crimped(dented badly at installation) OR using the ribbed aluminum stuff versus smooth HVAC galvanized ducting introduces a lot of air flow noise - of course the type and design of the filtration system also introduces airflow noise in the hood. By far the biggest problem we have found in over 20 years of custom range hood sales and installations is ducts that are far to small for the airflow generated by the internal blower - modern blowers (good quality ones) sense duct restrictions and run faster (more revolutions and therefore more mechanical noise) to compensate and delivery the requested volume of airflow - a simple mathematical calculation will illustrate this - a 6 " duct which everyone believes is adequate provides 28.28 sq inches of airflow capacity whereas an 8" duct supports 50.28 sq inches - nearly double the volume of airflow - so of course an 8" duct is far more efficient and is why we recommend an 8" duct over a 6" for 600cfm and 10" duct over 8" for 900cfm and 1200cfm. An added tip - another benefit of external blowers is that because they are far more efficient at moving air over distances and bad duct runs is an 8" duct is sufficient for say a 900cfm or 1200cfm external blower - qualification of course being a high quality external blower system such as ours - cant comment on the others out in the market - as always you get what you pay for......at Custom Range Hoods we are always willing to help and will assist anyone with technical questions - placing an order with us will of course open the door to a mountain of experience and good advice - feel free to email us at allenl@customrangehoods.ca....See MoreWolf Range hood and Broan / Best exterior blower combo
Comments (15)OK better late than never. I finally got the wolf hood fan and broan 335 They are working as designed. For reference, my Wolf range hood was the pro hood..PW482718 I believe. Inside the hood there was just one electrical wire. This wire connects to the house 120V supply. There are also two regular electrical plugs inside the hood. These electrical plugs are where you plug in the blower (remote or internal) You will need your electrician to run a 3 conductor wire from the blower down to the range hood. Here are the differences between the Broan and Wolf remote blowers: The wolf external blower comes with a power cord that plugs into the plugs in the hood. You then splice this cord together with the cord from the remote blower and hide it in the junction box inside the hood. The broan remote blower does not come with this cord. Fortunately it is just a standard 3 prong plug. Just picture a computer power supply plug, and cut the end that connects into the power supply off. Just make sure it is rated for the amperage of the remote blower. Plug one end of this cord into the outlet inside the range hood, and splice the other end to the wires coming down from the remote blower. On the other hand you can purchase the official wolf cord but it is like $65 That's it, everything works as planned, the blower fan speeds are infinite. Lights, heat lamps, etc all work if wired this way. There may be slight differences cosmetically on the exterior of the blower, but without having both I can't say. All I can say is the broan 335 works with 100% with the wolf pro hood, you just need to supply a power cord....See MoreWill a 1200 CFM blower be just as effective in 63" hood vs a 48" hood?
Comments (15)Unfortunately, most wall ovens do not have their own vent interfaces. What I did was put a pair of registers in the ceiling over the ovens, with their connecting ducts joined in a Y-adapter, and the output duct connected to a roof blower. The blower was a re-purposed NuTone down-blast roof blower purchased many years earlier to provide a boost to the vent of a Litton "kitchen center." The register boxes take (IIRC) 12 x 14 furnace filters to help keep grease particles from the ducts. Note that not even a commercial "eye-brow" hood will capture the smoke escaping a broiling oven when the door is opened. What these registers do is help pull effluent from the ceiling area and slowly clear the kitchen in concert with the main hood. The only way to successfully deal with opened ovens is a large hood right over them, or a commercial porous ceiling ventilation system, such as illustrated here: http://www.kitchen-ventilation.co.uk/heydal Yes, the MUA now becomes more complex because the control has to be "closed-loop" instead of "open-loop" and thus needs a servo control system to control an even larger MUA blower. My kitchen blowers' combined output is 2500 CFM (zero static pressure rating), and likely pull a total of 1500 CFM when there is sufficient MUA. With both blowers having variable control, the actual CFM can be anything, windows can be open or not, bathroom fans can run or not, etc., so the scheme is to control on differential pressure between my kitchen and the vented attic. Not all parts of this system have been purchased and integrated. My excuse is that my honey-do list is very long and keeps expanding. Items in place: Roof down-blast housing on pedestal for air intake interface with attic Hydronic heat exchanger in attic with its separate control loop to my furnace (functioning) 3-ft square diffuser in hallway facing kitchen Sensing system installed Control system components mounted in basement; Fuji computer purchased but not yet incorporated Key elements yet to be obtained (mostly from Fantech, I expect) Big axial blower sufficient to flow around 1500 CFM through the pressure losses of the ducting, air filter, and heat exchanger. It also has to fit through the attic access stairway. Current-loop control fan motor driver Pleated air filter box Damper Various sheet metal interface sections I should add that my only combustion appliance is a blown oil burner that has its own sealed MUA supply, so delay in completing this kitchen MUA system is an annoyance, but not a hazard. In your case, a carbon monoxide warning sensor is suggested. kas...See MoreRemote Range Hood Blowers: hood brand or generic?
Comments (7)54-inches (4.5 ft) x 2 ft = 9 sq. ft. Desired volumetric flow rate to achieve 90 ft/min across the hood aperture is 90 x 9 = 810 CFM. Blower rating needed to pull 810 CFM with decent MUA will be around 1200 CFM, as you noted. Fantech provides 'fan-curve' data in the form of tables, and also plots. A 1200 CFM unit (at zero static pressure) will show a value near 810 CFM at some pressure drop (about 1.2 inches, w.c., for the FKD10XL). Excluding MUA, most pressure drop will be from the hood baffles, unless one has several tens of feet of duct. It would be useful for you to obtain pressure loss vs. flow rate data from Bluestar. Fantech in-line blowers are, I think, axial blowers (like a turbo jet pressure section) rather than a flat plate with radial fins (like turbo chargers use). Broan blowers, including inline, appear to all be the plate type. There is nothing wrong with these, but they may have a different characteristic fan curve shape than Fantech's blowers. I've never plotted both together. (It is important for residential blowers operated at uncontrolled pressure losses and any speed from low to high that they have monotonic fan curves. Else they might 'hunt' at some setting. That would be annoying.) Plate type blowers are least conspicuous built into a roof cap. Commercial up-blast blowers use induction motors often tied to the fan assembly via a belt and sheaves. These can be tailored to provide the desired CFM at lower fan speeds, thereby reducing noise. They are, however, significantly more conspicuous on the roof. The primary advantage to using a hood manufacturer's specified blower is that it will directly adapt to whatever fan speed controls are built into the hood. Other blowers may require some type of adapter or control replacement. So a Blue Star hood's control nature might have to be determined. My Wolf hood adapts to my Wolf blower, made by Broan/NuTone, and likely would work with any other single wire pair induction motor blower up to some motor power limit. The Fantech FKD10XL data sheet show curves for a 5-step transformer control, and for no control. One would have to check with them for compatibility with whatever the Bluestar hood uses, such as phase control. If you use an in-line blower, you also have to find a suitable roof or wall cap. Fantech many sell these. You should have a damper at the hood and also at the roof cap. You need to plan out the entire hood duct path. Is there room for a silencer? Can the duct path rise over its entire length (desirable)? What elbows are needed? Fantech makes some duct couplings that may prove useful. Hanger strap material will be needed. Sound dampening material may or may not be needed depending on blower assembly vibration, which is mostly, I expect, due to blower fan assembly balance quality. Best to match MUA actual flow rate to hood actual flow rate (ex: 810 CFM). This avoids all (well most) pressure drop in the house, conferring safety with combustion appliances and keeping the wall dust in the walls. If active MUA is needed to do this (depends on combustion appliances and their MUA, if any) then a blower that can provide the required CFM at the MUA path pressure loss (usually any air filters, but could include the heating scheme if hydronic). As usual, the duct diameter in the hood exhaust should support a full speed flow rate of 1000 to 2000 ft/min. The otherwise clean MUA path is not grease deposition constrained, but larger will reduce pressure loss if there is room -- useful particularly with passive MUA. I'll skip MUA control in this message, but it needs to be addressed. Commercial rigs usually run at constant speed (exhaust and MUA), so tuning is easy. Residential variable flow rate, along with perhaps a need to deal with other exhaust fans and fireplaces, imposes more difficult conditions for blower control. You might need a Fantech MUA setup, or their 10V control type blowers run by a controller trying to keep house pressure relative to outside within some bound....See Morejrjunk
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