The only advice I can give that isn't already in numerous postings is to download a copy of the Greenheck Kitchen Ventilation Systems Application and Design Guide, read it, and then look for $1500. residential systems that most closely emulate the commercial approaches. Note that make-up air may be required, and this will cost some additional amount depending on too many factors to address in this message.
http://www.greenheck.com/media/pdf/otherinfo/KVSApplDesign_catalog.pdf

kas

I will take a look thanks!

I'll reiterate my experience that I've posted in other threads: in a nutshell, if it's at all physically possible and if you're going to spend $2,500, consider a hood liner, roof mounted blower, and inline silencer. We bought a 42" Zephyr Monsoon II insert for our remodel but found it to be impossibly loud. I downloaded a decibel meter to my phone and, with the fan on low (450 cfm) and the phone sitting on the stove 35 inches below the hood, the decibel app read 80-82 db. That's uncomfortably loud for us, and you couldn't hear the Sonos speaker 12 feet away set at a pleasant level--or people talking, for that matter. In short, the 1200 cfm Zephyr sucks a lot of air, but also your sanity.

Faced with the prospect of saying "thank god" every time we turned it off for the next 15 years, we finally decided to switch it out for a Wolf liner with a variable speed knob rather than buttons, silencer, and 1400 cfm Abbaka roof-mounted blower. The difference is amazing. The Abbaka on high (1400 cfm, ~72 db) is quieter than the Zephyr on low (450 cfm, ~82 db). And unlike the Zephyr, the Abbaka hums along quietly when dialed down low, so we're much more inclined to use it consistently rather than sparingly (and with annoyance).

One moral of this story is that if you want effective, quiet ventilation, (e.g., Walt's Wolf-Fantech-Abbaka components) it will cost more than you may like, even if exterior aesthetics are not a consideration, being given over to the liner cabinetry in Walt's case. I have a quiet result from Wolf-Fantech-Wolf (Broan) components, but they weren't inexpensive either.

A common thread for quite a few years now on this forum is that kitchen design with serious cooking in mind and appliances to match must consider the ventilation consequences and allocate funds accordingly. Alternatively, if one's gastronomic lifestyle is ramen, then little to no ventilation is required, and 1950's grade ventilation will be adequate.

kas

Thanks for the feedback, thinking we would be slightly crazy not to do it right first time and now looking at external blower on the roof as the best option.

Ben