In the weeds: Vent hood, make-up air, and venting outside - help!
building2017
6 years ago
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building2017
6 years agoRelated Discussions
Help to clarify hood/venting? Picture of vent components?
Comments (2)Amanda, check with the Tradewind liners. You will see all the components detailed on their website and the purpose of each component. They are great about answering questions also. I bought all of my components from them . They have excellent products and great prices. I have a 54" hood liner, inline silencer, 1400 cfm external remote blower on my back roof. The equipment is very quiet and very efficient. Much is made on this forum about Brand names but my vent system is much more for much less than anything you will see written up here. Hope this helps you with your decision. You can e-mail me through GW, Here is a link to the company. Here is a link that might be useful: Tradewind Hood liners...See MoreOTR Micro: Vent Outside better than Convertible (vented outside?)
Comments (8)Not sure what part of country u r in or what type of construction or housing. In SoCal where I have lived, airing out a house is nearly daily even on chilly days up in the mtns. In the northeast, essential to have some outside air circulation in summer because of humidity and heat , essential in winter because of stuffiness and dry air. So in both cases we have managed with recirculating internal vents. THERE IS NO QU that externally vented are faster and more effective. ALL are noisy. In condos and apts we have lived in, there are restrictions on external venting... Can't vent within "x" feet of someone window, for ex., so do be aware of local code, Lastly, the effort and cost are a consideration depending upon where the vent will penetrate to the outdoors. There are split units btw, where the actual motor and blower are mounted exterior or remotely from the actual hood and fan... This is to reduce interior noise. Most don't come this way and the split is more costly to buy and to install... AND if it is a high volume (CFM?) I can tell you that the split is not that much more quiet. Good luck. You never know who and when you might be swept off into the rain bowed horizon...See MoreMake up air vent location for range hood?
Comments (16)In order to begin to understand it, you would need to buy ANSI Z21.1 for about $650. There is some very technical engineering, even though it doesn't look like it, in the ventilation between walls of the oven and cooktop sides that ensures that the cabinets up against the range will not get hotter than 194°F. If you block the airflow by lowering the range (some people try modifying the feet for thin countertops that make them less than 36" tall), or putting ducts in for MUA, the outside wall of the range will get hotter. If you force that much extra air through the range, (push or pull) you change the way the gas burns, and create CO problems. Even if you can adjust the air shutters to compensate, you would then have to turn on the entire system just to make a pot of tea, in order to get enough air to get a clean burn. With holes in the floor or back wall, the natural draft intended/engineered to cool the outer walls of the range can be disrupted or diverted, leaving the heat to build up around the range - nothing to do with heat in other areas of the home. What can't tolerate more heat than the wood cabinets around the range? Another separate reason for no holes is the possibility of a gas leak. How much gas do you think that duct will hold, just waiting for someone to create a spark? The testing standards do not say no holes "unless someone thinks of some unusual excuse"....See MoreWhat type of vent hood when you can't vent outside?
Comments (7)My original issue with VaH (a decade ago) was their specious CFM claims that did not provide any "fan curve" information that would allow one to calculate actual CFM given some duct losses and MUA losses. More recently, I have seen some appropriate data published for their ducted units. However, checking just now, I see that they provide "n/a" for CFM for a representative ARS model. This is unconscionable. The ARS, being a closed system, has a volumetric airflow rate unaffected by exterior effects. They need supply only one easily measured number. How would one know if the flow rate is suitable for a particular cooktop / cooking style without knowing the specific (CFM/sq. ft.) flow rate of the hood? Given time and budget and no access to a residence exterior, I would probably research commercial solutions to this problem and adapt a filter to a conventional hood and blower. Sheet metal shops can easily build the needed "duct/filter" structure. On the plus side, recirculating systems do not need heated MUA and thus are more energy efficient. They avoid having a lot of house, basement, or attic space taken up with a powerful MUA system. On the negative side, for a given hood entry aperture flow rate, they will be noisier than an external blower with intermediate silencer....See Morebuilding2017
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