I want to make overhead exhaust hood to be used over the diningroom table when using electric table grill. It doesn’t smoke but I would like less smell after the meal. The table sits right under a double hung window. I found 2 kinds. 180 cfm verticle discharge fan (the one that is usually found in older kitchens above the range wall) and 6″ 250 cfm in-line duct booster fan. I think the discharge fan will be noisy, so it will be set outside with flexible duct connection. The duct booster fan, I heard, is fairly quiet, so maybe I can connect the booster fan directly to the hood framing. The hood will be simple plywood box that will hang over the window sash, and the other end supported from the ceiling. Fantech fans are too expensive for me. I know what discharge fan will do for me, but I don’t know how booster fan will work. The booster fan is rated 250 cfm, but what does that mean? Is it 250 cfm within the confines of the sealed duct, or would it give me necessary suction, drawing the air in the box toward it? Does the fan blade size matter? By the way, the hood will be made moveable, only to be used when grill is used. Thank you all in advance for any advice.
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