MUA - Make up air for range hood
Boring details - 48" range, 23k btu burners + grill, custom 48" hood, Fantech FKD 12XL.
I'm considering building a passive MUA system-
(3x) 3.25" x 14" rectangular riser ducting tied to 14" round duct leading to outside fresh air. 14" duct will have passive louvers, screen, and electric damper.
The rectangular risers will be installed in the wall behind the range, venting into the void directly underneath the range. The damper will be opened when the hood fan is turned on.
I understand the fresh air won't be heated/cooled by a heat exchanger, but it seems pointless to me to treat the MUA since it will immediately be exhausted through your hood. Unless your MUA input source is substantially far away from your hood (undesirable) - what does it matter?
The passive system is very economical, quiet, and the air flow dynamically adjusts according to the demand - so there's no complication with syncing the variable speed exhaust and MUA fan speeds as with an "active" MUA system. Thoughts? TIA..