My last post “exhaust fan” somehow got lost with another post of the same title. I hope I can just rewrite this post. I want to make removeable venting hood when we use table top electric grill. The table sits right under double hung window and I can perch the hood over the open sash and support the other end from the ceiling. I see two possible types of fans to use. One, regular wall mounted fan (180 cfm) that I can sit outside and connect to the hood with a duct. I want to set it up this way because this kind of fan is noisy. Two, 6″ in line duct booster fan. Although this is rated 250 cfm, I wondered if this cfm rating meant something else for the sealed ducts. I heard this kind of fan is quiet so I can install it right over the hood. The hood will be paint plywood and will be removed when not being used. Can I use duct booster fan and expect to get the draw I need? Thank you in advance for advice.
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Replies
Keep in mind that range hoods always have removable, cleanable, grease-catching screens, for good reason. Otherwise it won't be long before your fan assembly is a sticky, nasty, inefficient mess.
There are two ways to move air out of the house: you can de-pressurize the space, which is what your current idea would do. Or, you could pressurize the house, and open the lower part of the double-hung window so that air would sweep across the table area and out the window.
For a cheap and easy way to experiment with this, temporarily install one of those big, cheap ($25) window fans in a room that is open to the dining area, but not where the noise will bother you, and, with all other doors and windows closed, see if it does what you want. These fans can move a lot of air, like 500+cfm.
barbequeing indoors is never a good idea,
building a range hood from flamable material is a worse idea,
don't even think about your ins. co covering you..
do it right or do it outside!
Inline fans can be quiet, but with something intended to be a kitchen exhaust it will require metal ducting which transmits a great deal of noise even with a remote fan. Make sure the remote fan is rated for kitchen use.
Personally I think you would be happier with a ceiling mounted round grill over the area pulling at least 400-500 cfm. Add a few rare earth magnets on the edge of the round grill and have a straight piece of metal duct with a flange on one end to grab the magnets and long enough to sit a few feet above your grill--less if you like. Easy on and easy off.
The majority of your odors will be drawn out with this setup if you are pulling enough cfm and the fan would still work if extra ventilation is needed in the kitchen.
Booster fans are notoriously noisy so that would be a poor choice unless you don't mind the noise.