We used a "Zephyr Breeze II" with our Bosch induction cooktop. Powerful, quiet enough, 3 speeds, and nice lighting. Ours is 36" wide.

CFM: 42 x 24 inches is 1000 sq. inches or 7 sq. ft. At a desirable 90 ft/min through the hood entry aperture, flow rate should be in the region of 630 CFM. Due to baffle and MUA restrictions, a blower rated at 900 to 1000 CFM may be needed to achieve the desired flow rate.

MUA: Additional MUA will be required; at a minimum an 8-inch duct with damper and air filter, perhaps also heating. This depends on your household combustion appliance back-draft susceptibility. Your HVAC contractor may be able to advise on whether the existing MUA can be upgraded. Normally, residential furnaces are not intended to deal with a 630-CFM cold air draft, so even in this case an in-line heating scheme may be desirable.

Noise: With such a short hood system duct, blower blade tip turbulence noise will not be moderately attenuated by duct length and can't be suppressed by a silencer. If an external chase were installed that could fit an "8-inch" silencer (12 inches diameter) in the duct's route to the roof area, quieting is possible. An external oversized blower operated at less than full power might be quiet enough. If you use an in-hood blower, forget about it.

Search this forum for hood and MUA topics and you should find many examples, as well as useful links.

kaseki, thanks for the information.

Can you help me figure out if I need that much collection area, given our use case (per my OP)? I'm not opposed to dealing with MUA modifications, but obviously if I don't need them, I'd rather not put in the time and money. If additional MUA is needed, is it crazy to look at a separate MUA system independent of HVAC near the cooktop? Basically a direct inbound duct with a powered damper and an interior nice looking vent? Perhaps on the large amount of wall space above the cabinets/hood (ceiling is 12 - 16' slanted)?

In terms of ducting and noise, I think I could probably get a wall-mounted exterior remote blower by our HOA, but seriously doubt I could get away with an external chase of what would have to be 10-15' up to the roof area. Would it be worth doing a standard top vent, running ducting inside (hiding it with an extendable cover or woodwork) up a few feet with an 8" silencer, before elbowing outside to a (vertical wall) remote blower? Or would that still leave the remote blower too close straight-line wise? Absent that being feasible or worth it, I was looking at the Victory Twister, which appears to have a solid 42" hood with a back vent option, which would remove the 90deg elbow and result in a max 12" straight duct out. I'm assuming in this scenario, an external blower would make no sense? Any other issues you see with such a straight and short duct scenario?

On a totally unrelated note, it seems most of the higher-end hoods have the light and fan controls on the underside/bottom which seems really inconvenient and likely to get filthy quicky. Also, having to bend down and crane up to try to adjust them, especially while something is cooking, seems unsafe. Am I missing something?

All things considered, what specific brands you would recommend?

I want to focus on sound level/quality only for a moment so my brain doesn't explode. If we did a hood with either baffle-based filtering (eg Wolf, Imperial, etc) or none (eg Vent a Hood), with a standard top vent going immediately up to a FanTech LD8 silencer, then immediately to a 90deg elbow out to a remote blower (eg Vent a Hood RM1000 1000cfm), would that be noticeably quieter at any given airflow level than the same hood with an internal blower of the same capacity? An internal or exterior chase are not an option.

So,

1) Vent a Hood -> LD 8 silencer (~24" of vertical rise) -> 90 elbow thru exterior wall -> remote 1000 CFM blower

vs

2) Vent a Hood with internal 1000 CFM blower -> 90 elbow thru exterior wall

Would option 1 be noticeably quieter than option 2?

Because I haven't owned a VaH Magic Lung® I can't comment with certainty, but I can assert that I expect the baffled hood with external blower and intermediate silencer to be quieter. The VaH has the blower(s) right at the cook's ear, so they aren't going to be quiet at full power. Here are some relevant threads ­­­— credit @clinresga :

https://www.houzz.com/discussions/2324336/vent-hoods-and-noise-the-real-scoop-on-vah

https://www.houzz.com/discussions/6417748/hood-depth-question#n=10

@opaone may have commented on this also, but I didn't save the link, so a search of his body of work here may help.