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remote vs. in-line blowers on kitchen vents
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Posted by genie73 (My Page) on Tue, Nov 17, 09 at 12:49
| Does anyone know if remote blowers are quieter than in-line blowers on kitchen vents. Is this an automatic thing or will it still depend on the make and design?
Also, are remote blowers more expensive that in-line blowers?
I'm still so confused on which hood to get.
Thanks |
Follow-Up Postings:
RE: remote vs. in-line blowers on kitchen vents
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I'd think an inline blower is low cost.
I got one. I built all the rest around it. |
RE: remote vs. in-line blowers on kitchen vents
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A clarification:
an inline blower IS a remote blower, at least using the standard terminology. An "internal" blower may be what you're referring to: the fan unit is mounted inside the actual hood. Remote blowers are located outside of the actual hood. There are two types of "remote" blowers--i.e., fan units that are NOT mounted in the hood itself. Inline blowers are installed remotely, somewhere in the run of ductwork. They are typically mounted inside, in an attic, for example, as ours is. There is then another run of ductwork from the blower to where the exhaust exits the house, on the roof for example. Here's a popular one: Fantech inline blower An external blower is mounted on the outside of the house, usually the roof, but sometimes on a wall. Here's an example: Abbaka external blower The choice of an inline vs external blower can be complex, and depends on factors including space (is the attic big enough to put an inline blower in?), access (is the roof so steep that it is difficult to mount an external blower?), noise, cfm ratings, etc. The decision to use a remote blower rather than an internal blower is mainly driven by a desire to minimize noise. Internal blowers can certainly match external blowers for performance, but they cannot match an optimized remote blower setup from the standpoing of noise. |
RE: remote vs. in-line blowers on kitchen vents
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| Remote(External) vs. in-line. Both of these are located outside of the hood. IMO the in-line blower is quieter. Also, an option in the installation allows for the in-line blower to be mounted using links, therefore; there is no vibration noise. However, keep in mine, moving air makes noise, whether using a remote, in-line, or internal blower so make sure the duct size is in accordance with specs. Also, minimize turns in the duct. Another key point is the larger the blower, the quieter the operation when on low. Low is the setting used most often. |
RE: remote vs. in-line blowers on kitchen vents
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| I had the same questions. Vents, blowers, etc were all confusing. I think you're duct work and space will determine the type of blower. Originally I was going with an prestige in-line 1200 CFM blower ($800). I needed to minimize the viusal impact to the outside of my historic house. The vent could be seen from the street so that's why I planned on an internal blower. Now I totally rearranged my kitchen and will buy a 1200 CFM prestige external blower ($1000) instead. This will be mounted on a side wall in the back of my house. If I was going to do an in-line blower in the latest kitchen drawing than I had to make a "door" in the ceiling to get at the blower if I needed to in the future. The in-line blowers are big 41"L x 21"W x 14" H. If you're worried about noise you can have a fantech silencer in front of the blower - but they're big too. I don't have room for it. |
RE: remote vs. in-line blowers on kitchen vents
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| It all depends on the specifics of what models you are thinking about . One style is not clear cut cheaper or quieter. System design will play a big part in it too. If you are serious abotu it being quiet , better enlist help of an experienced designer and check out some installs. |
RE: remote vs. in-line blowers on kitchen vents
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| Oh boy. Thanks to all of you for your input but I'm still confused. Here the specs: We are getting a 36" Wolf with 6 burners, so I'm thinking 18" high, 42" width, under cabinet/wall mount with at least 900 cfm. The range is on an external wall that can vent straight out (no turns in the duct) and not to the roof (2nd floor above). It is NOT important for that exterior wall to look pretty as it faces the back of the garage. I suppose I'm confused on whether to get a hood that has internal blowers or one whose blowers mount on the outside of the house and what the difference would be. Sorry if I mixed up my terminology. I don't know which one to get for under $2000 Cdn that will not sound like an airplane taking off in the house. help?! |
RE: remote vs. in-line blowers on kitchen vents
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| genie, since you are also in Canada, do check your local building codes to see if make-up air is required. In my jurisdiction, any fan larger than 250cfm requires make-up air, and 600+cfm definitely requires heated make-up air. My 600 cfm system incurred $7K in installation costs that I was not expecting. It made my other fairly high end appliance price tags look insignificant. |
RE: remote vs. in-line blowers on kitchen vents
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| Genie typically an external blower, as clinresga quite correctly defined being distinct from an internal blower is typically more money than an internal blower system. There are two components to noise - firstly there will be the airflow noise which is dependant on many factors the least of which is the filter system - good quality baffles will make less noise than a mesh filter, and then of course there is the ducting - restricted ducting will significantly increase the noise because good quality blowers work harder to maintain the airflow called for by the controls. So internal or external blower wont matter much with airflow noise. The second main component of noise is mechanical noise from the blower itself or vibration from an unbalanced motor - here again a high quality blower will have less mechanical or vibration noise noise. Generally most of your ventilation takes place at around 30% or so of blower capacity - you just dont need to crank it up all the time - when you have lots of smoke from say a griddle or steam then you can increase the cfm needed to get the smoke or steam out. So which is better - internal or external - external is a little quieter generally even with high quality blowers but you should weigh up the increased cost of an external blower against the occassional marginal increased noise as a result of mechanical noise when you crank the blower up. The last post by cooksnews is an important one to consider - if you are under permit in certain cities of Canada you should consult the controlling body about make up air - if they require it then with a 36' Wolf 6 burner you MUST have the cfm power because it WILL create a lot of heat and potentially smoke and therefore you will have to do that make up air. |
Here is a link that might be useful: Canadian Supplier for Modern Aire
RE: remote vs. in-line blowers on kitchen vents
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| genie73, do you have the latest in air handling and heating systems? A Heat Recovery Ventilator (HRV) or an ERV. What heats your house? What moves air if anything? What year was your house built? Is it leaky or airtight? For about six months of the year you keep windows closed, so plan where air should come from. Even artisan fireplaces have a tube going outside to get fresh air to have oxygen to burn. Once you go higher than 300 CFM, your biggest problem is figuring out what replaces the air that is supposed to be blown outdoors. Without any new air coming in, on 'high' the blower will work extra hard, straining and making noise, without even managing to get the air in the duct to move much more than "X" (pick arbitrary midrange number here). |
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