That hood is about 2 ft by 4 ft. I don't ever get condensate dripping from the hood, but I have had condensate leaking out of the ducting and fan in the winter.
The need for make up air is a combination of how tight your house is and how strong the exhaust fan is. As an interesting data point, where I live a make up system is required by code if your range hood fan is more than 290CFM. So in the basement of our current house (built to 2010 code) there's a massive 12" duct that comes from outside, that opens/closes with an electronic baffle whenever we run our range hood. The air is heated with a 3000W heater if the air's too cold (it was -31F today so it definitely gets cold here).
I have a separate make-up vent in my brewery so that when I brew I can close the brewery door and no suck heated (or cooled) air out of the rest of the house.
Kal
No. I don't think that would make much sense (at least for me) given how rarely the system is producing a large amount of heat.Have you thought about installing a HRU in your brew room to recover the heat from the exhaust in the Winter time?
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