600 CFM is an enormous amount of air to exhaust from a home.
Originally posted by rstagg
Hi All - this is my first time posting to this particular site, many pardons in advance if I'm repeating a recent question. I just scanned through some recent threads and couldn't find anything applicable.
We're building a 2200 square foot ranch in southern Ohio. It has a 12/3 vaulted ceiling on the main floor, and 9 ft ceilings in the walkout basement (also 2200 square feet).
We're building a large kitchen in this house that includes a 600 CFM Vent-A-Hood range ventilator. It's vented to the outside through an 8" duct. As VAH vents do not use baffles or filters they are not plagued with the static pressure problems of other hoods, so they truly move about 600 CFM.
I'd imagined that in this relatively modest-sized house the HVAC guys would recommend some dedicated make-up air system, with dampers and duct heaters and all that mess. But they just presented a plan that just upsized the size of the furnace fan (not sure to what) and upsizing the AC compressor from 2.5T to 3.5T. It's not a high-efficiency furnace, so there is an duct run that brings fresh air in.
Does this sound reasonable to you? Their tech assured me that a separate make-up system like I described would be overkill - what do you all think? We don't want this house to drop in temperature 10deg everytime we cook during the winter.