Short answer (read my many other hood parameter messages for background): Actual flow 90 CFM per square foot of the entry aperture area of whatever hood you choose, preferably a deep one. Rated blower CFM: 90 x area x 1.5 if the MUA path has no significant pressure loss. Otherwise, more.

At best, high flow rates will extend the hood effective aperture by an inch or so on each side; you won't have the side capture of a 42 inch hood with 36 inches.

MUA will have a pressure loss unless a window or door is open and unscreened (or a lot of doors or windows are open and screened). If your house can normally leak ca. 900 CFM with no pressure loss, you must live in Pago Pago.

If house pressure falls below -0.03 inches of water relative to the outside, you are in danger of back-drafting carbon monoxide from any combustion appliances you might have unless they have full sealed MUA.

There are 4 two windows in the kitchen. If I’m finding it to be a problem I’d open one for the times I’m using it at full power.

I appreciate the MUA information, but I’ve read and tackled this one already. I’d rather this not turn into another MuA discussion.

An external blower won't help but could hurt since you are already on an external wall. That external blower is huge and depending on where you live, may not be able to be serviced in the winter. 900 cfm's should be fine but make sure you look at the sone rating when not just on low setting. Different brands try to trick you with this rating but they are quite loud on medium and high settings.

I looked on Aitoro's website and brands aren't too limiting. I recommend a parametric style hood which will create a virtual capture area and help to guide the smoke since you don't have the upper cabinets flanking the hood. There are a few on the market.

Thank you. I think I'm going to find a hood that vents directly through the back and out the external wall the hood will be mounted too. Also keep the blower internal. Make life easier.

I better look of parametric now...