Venting attached garage to create negative pressure, good idea?
Climate zone 6B new construction with an attached garage. I have an attached 3 car garage that will serve as a hobby, car tinkering/building workshop in summer and winter.
I have a sealed combustion natural gas heater planned to heat the garage in the winter. The plan is to keep the garage between 35 and 45F all winter and bump it up on the weekends when I am working in it.
I’m conscious of the types of stuff I work on in my garage and toxic fumes and car exhausts leaking into the attached house. I’ll have the garage house partition sealed as well as possible.
I don’t think I want a full blown extraction system in my garage but I think it warrants a slight negative pressure in the garage compared to the house therefore I was thinking of putting one of those Panasonic whisper wall mounted units:
Do you think the whisper 70cfm will serve me well? The garage is 1300 sqft with 11ft ceilings on 2 of the bays and a 13ft ceiling on the workshop and 3rd bay.
Does it make sense to have the fan run 24/365 or set it up as an interval such as 10 minutes run time every 30 minutes?
I there anything I’m overlooking with respect to this plan?
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