Makeup air in all electric home?
I have read a lot of blogs and questions that, quite reasonably, recommend makeup air for kitchen exhaust fans in tight homes. The use of these fans can cause backdrafting in combustion appliances. But what if the home does not have any combustion appliances? We typically design very tight homes, around 1 ACH(50) with no combustion appliances. We use heat pump water heaters, Mitsubishi mini splits, and electric condensing dryers. We also use Induction ranges and cooktops. No fireplace. We tell our clients that if they want a fireplace, they can have one…outside. I am still somewhat concerned about all of the nasty stuff created by the process of cooking. I know that a lot of people use recirculating hoods and combine that with an extra bit of HRV exhaust in the kitchen area, and that is exactly what we have been doing. But I wonder if we could install a reasonable kitchen hood without makeup air in a home that has no potential for backdraft? I am still hesitant about putting a hole that big in our envelope with nothing but a thin damper between the outside and the inside, but I also want safe healthy air for our clients to breathe. Thoughts?
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