Help!!! Anyone know about Best by Broan range hood with IQ blower
Chacha Lamacha
9 years ago
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hvtech42
9 years ago
williamsem
9 years agoRelated Discussions
Best or Broan range hood?
Comments (9)A typical range hood maintains a similar position directly above a cooking surface, most often the stove. Range hoods should be wide enough to cover this surface entirely. The hood consists of a skirt positioned over this surface at a height that is comfortable for the average user. The skirt surrounds grease filters backed by a fan that sucks air into the unit. Fans may feature several speed options. Most fans have at least two speed settings, one designed for operation during cooking, and one that is much quieter to be used during meals. Some advanced models have an automatic fan feature that turns the fan on when temperatures get too high. This feature is a signal to the fan that steam or smoke might be present in the air and the fan should be operating. Range hoods can also feature automatic shut-off timer options. Here is a link that might be useful: range hoods...See MoreRange hoods: Please Help! Broan Elite RMIP Pro-Style? Silencers??
Comments (15)One thing that seems to be shown here, from your experience and also laranbrian's, is that mesh filters are noisier. We have "pro style" metal baffles. Here's the (obviously biased, but I think informative) quote off the Modernaire site: "Modern-Aire Ventilating believes like most major range manufacturers and restaurant supply houses that the most efficient filtration system is the Baffle Filter. Unlike non-filtered range hoods, a Baffle Filter catches up to 97% of all grease and grease particles before they ever enter the interior of the range hood, making clean up a breeze. Unlike mesh filters, the air passing through a Baffle Filter is not restricted, thus allowing a smoother and quieter transition. Perhaps the most important aspect of the Baffle Filter is that the baffles in the filter are positioned to eliminate direct passage of flame through the filter thus making it one of the safest and most efficient filtration systems available today." I think it's a far superior design for the liner. And it looks cooler too :-)...See MoreVent-a-hood versus Broan/Best
Comments (2)Heh! Like toying with hornets' nests do yah? VaH salesmen have a long history of what I view as disinformation and partial truth telling, so let me provide my opinion of these assertions. 1) The grease laden cooking effluent has a spectrum of particle sizes. Neither the VaH sling system or baffles (which is a centrifugal sling system also in practice) or meshes remove all of this vapor stream. The goal for filtering is to remove particle sizes likely to accumulate on the duct walls and have the remainder expelled to the atmosphere. All effective filtering schemes do this. While spectrum data are not provided by VaH, or for that matter by residential hood manufacturers, some typical performances can sometimes be found for commercial hoods or special filtering schemes designed for special cases. 2) I have no knowledge of warranty claims. 3) Feh! The capture area is what is designed into the hood configuration, and can be large or small for either type of design. Note that the entrance aperture under a baffle system (with the baffles above the entrance) is the capture area. Capture volume also is important. But it is capture and containment that is the goal. VaH may have better capture area than several poser hoods we all have seen with flush baffles or meshes occupying only a portion of the hood base area. 4) Double feh!! One essential requirement for baffles and mesh filters is to be a fire stop. What if a fire damages the VaH motor wiring and the motor stops? The squirrel cage will not be able to break up flame passage as well as baffles or meshes in that case, I suspect. Anyway I see this as another red herring. 5) As documented here in many cases, a roof mounted blower is perceived to be quieter than one next to the cooks ear, and its noise can be significantly suppressed by an in-line silencer, if space allows. A large roof blower will have lower blade tip speed than the VaH blower for the same CFM, and likely lower sound-causing blade-tip turbulence as a result. In the 2009 era, clinresga, who had both types in two houses, demonstrated by comparable measurement reported in this forum that his VaH was noisier. However, VaH may have improved their design by this point in time. 6) Complaints about VaH motor and box cleaning effort have been made by owners on this forum. Most baffle and mesh filters can be cleaned in a dishwasher, although pre-soaking in a sink with Simple Green may help soften older grease residue. VaH's claim of higher equivalent performance: What I am willing to charitably assume for VaH when claiming their motor has some higher equivalent performance is that their motor would move more air if it weren't in a hood, whereas most blowers are spec'd in free air. While true, one can't know what another blower will do without knowing its fan curve and all of the pressure losses in the system, many of which are applicable to, BUT NOT COUNTED, by VaH claims. Worse in this regard, their recently published tabular fan curve data shows worse performance with increasing system pressure loss than equivalent flow rate Broan fans that I have looked at. Hence, a VaH hood system with some make-up air pressure loss and duct loss and sheet metal transition loss may move less air per unit time than a remote blower rated at their equivalent flow rate with the same losses, plus baffle loss. This is likely a limitation of squirrel cage fan designs. I suggest for conventional fan blowers with baffle hoods that the rated (zero static pressure) air flow rate be 135 CFM per square foot of hood capture aperture. This should yield about 90 CFM/sq.ft. actual flow. Other rules of thumb can be applied. This is mine. The only air that moves out through the hood to the outside is that matched by the same flow rate of incoming external air made up via deliberate MUA paths or by house leakage. If this is a particularly leaky big house, and there are no combustion appliances connected to your kitchen air, then leakage may work. But I wouldn't bet on it. You likely need a dedicated MUA system. Other than having more leakage potential, the size of the house is irrelevant. This whole subject is complex, but you may learn a lot by searching this forum for various hood, blower, and MUA threads. If you want to be your own HVAC engineer, then some research is necessary. We can address in future messages the hood size, flow rate, and MUA issues. kas...See MoreThermador Range Hood Install with a Best In-Line Blower
Comments (7)Blowers built for the USA market will, with whatever electronics they might need, be designed for ac operation. Blowers that are induction motors, with or without capacitor start, use the ac directly. CFM for these can be controlled by simple circuits that chop up the ac waveform, in a sense. To my knowledge, no one uses universal motors for this function that could run directly on dc because they are noisy and big EMI generators. However, it is possible to build multi-phase motors that run on synthesized ac waveforms. For historical reasons, these are sometimes called brushless dc torque motors because they emulate the functionality of such motors, but use magnets and switching instead of a wired armature and brushes. Their electronics convert the house power from ac to dc, which is then switched at some frequency (variable) to provide ac to the motor stator coils. The rotor magnets are "locked" to the rotating waveform as the coils are energized and de-energized. So what is really needed is knowing what control is used with what motor, and whether this control can be inserted into the hood where its existing control is, or whether the existing hood control can deal with the blower motor directly. In my Wolf hood, the control is a simple diac/triac circuit that can run almost any induction motor up to some current capability. Since I have a 1500 CFM blower on my roof, obtained from Wolf but constructed by Broan/NuTone, I imagine any lesser blower of that type would run fine. If your Thermador hood has a similar setup, then I'm sure Fantech, for example, can provide an in-line motor of appropriate size and CFM. N.B. It is my opinion that the reason why my Wolf hood variable CFM does not go down to very low air flow rate is that the baffles have to have some minimum air velocity to remove grease by centrifugal extraction. My hot wire anemometer does not go down that far to measure it, but I suspect the minimum flow rate is not less than 20% of max.* In any case, my hood system is fairly quiet on max, and nearly silent on min. The reason is using a remote blower and in-line silencer (from Fantech). Bottom line: I cannot answer what Thermador does, circuit wise, but can guess that they are compatible with more than their own blowers. So the question to be asked of Broan, or Fantech, or Abakka is: Are you compatible with Thermador? If your hood includes a schematic, maybe attached inside its electronics box, then we might have more insight if you can scan it. __________________ *Edit: Reviewing the Hood FAQ, I see that I was able to measure the low speed volumetric flow. The measured value is consistent with the point of this paragraph, if not my guess....See More
a2gemini
9 years agoSherylJ
9 years agoa2gemini
9 years agoChacha Lamacha
9 years agolydiacaitlin
9 years agoChacha Lamacha
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yeh_yeh
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9 years agoRiese Hairfield
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