Ventahood. Faber. Kobe. Don’t forget the make up air system thst your setup will require.

Thanks Celadon. Is there a specific model that fits 8inch duct. If you have any personal experience with a specific model that will be helpful.

They will all fit an 8” duct. There’s a couple of hundred models and combinations to sift through. The capture area needs to be wider and deeper than the cooking zone, with at least 1200 CFM, and add in the MUA. Narrowing it down for your style and logistics requirements is up to your Kitchen Designer and you to sift through. Too many unknowns on this side of the Internet screen.

And get something with baffles instead of screens or filters. Baffles are great, they collect the grease very well and you can pop them out and stick them in the dishwasher! Mine came with the range... we got a great deal on a floor model, it’s quite loud but I don’t care, it’s effective. I do a lot of high heat cooking with strong smells as well.

Cart before horse often leads to misdirection.

The overall requirement here is capture and containment. Capture is getting all of the rising and expanding cooking plumes into a hood aperture; containment is getting the plume content through the baffle filter without any reflecting out due to insufficient hood air flow failing to entrain the plumes.

Capture requires that the hood entry aperture overlap the cooking surfaces by enough to deal with the plume expansion, typically about 10 degrees from vertical for the major part of the plumes. Wall hoods need not deal with the expansion toward the back. Overlap means that the hood is wider than the cooking surface and deeper than the cooking surface.

Containment means sufficient air velocity at the hood entry area, which relates to sufficient volumetric air flow rate, measured in the USA as cubic feet per minute. I recommend achieving around 90 ft/min velocity, or 90 CFM per square foot of hood entry aperture area. For example, a hood aperture of 3 ft x 2 ft or 6 sq. ft. would require a flow rate of 540 CFM.

Depending on pressure losses in the air loop from kitchen to outside and back into the kitchen, the blower needed to achieve this flow rate will have to be rated for higher CFM at zero static pressure. A rough estimate assuming some reasonable make-up air (MUA) pressure loss is to use a factor of 1.5 greater CFM. For our example, the rated CFM should be about 810 CFM.

The duct size should be sized for an internal velocity of 1000 to 2000 ft/min at the achieved flow rate -- 540 CFM in our example. Whether an 8-inch duct is sufficient will depend on your hood size which depends on your cooktop and pan sizes.

In general, given good MUA, the highest pressure loss will be the baffles doing their job of removing the grease particles from the larger end of of the grease particle spectrum, and the flow rate in the duct will move the rest of the particles to the outside. In residential hoods, the baffles collect grease and move it to the lower ends where tray like features can hold some. In commercial hoods, grease cups are used due to the higher rate of grease collection.

Good MUA means lower pressure loss than the baffles. A few tenths of an inch of water column should be OK. Review MUA related threads here because there are many factors involved in introducing MUA into a house and thence into a kitchen, and, in some cases, heating it.

For others benefit. Design the ventilation systems before building the house if possible.

Appreciate all the details, it will be very helpful if you put like 2 or 3 top models of your choice to narrow it down. I am stunned with the technical explanation you provided and absolutely makes sense. There are a ton out there and i am lacking time searching. COVID has created a shortage in the market as well, so many challenges to pick one single range hood.

JuneKnow - Absolutely new to home construction and my builder is pressing to make selection faster. Its a new home construction and not a remodeling project. Apologies for not giving additional details.

I am leaning to buy this cook top

https://www.kitchenaid.com/major-appliances/cooktops/gas-cooktops/gas-5-burner-cooktops/p.36-5-burner-gas-cooktop.kcgs556ess.html

MUA - Make up air - Yes the contractor did say he will compensate but he can support at the max 700 cfm of range hood.