I live in Oklahoma zone 3A, I want to install a kitchen vent hood with 450- 500 cfm with an in-line duct fan in a 8″ or 10″ duct. I will have a 45,000 btu cooktop with electric oven, how hot does the exhaust air exiting in the hood get? Can anyone recommend one.  I research kitchen in-line fans and the type fans that pop up are rated for 140 degrees.  There are no other gas appliances in the house.

Mua   It seems this topic is years behind the times and very few good answers. My plans are to put in two location 16 x 25 x 4 merv 13 filters in a  return air ceiling grille ducted thru attic and out the roof.  Grilles  will be 20′ -30′ in a direct line of site  from hood in a  hall and pantry.  Kitchen is in large great room.  My thinking on two locations and distance will allow air to be tempered and less uncomfortable to occupants.   Attic duct one large (10″) branched to both filter boxes or separate ducted out roof for each?  Dampers do they need to be motorized and tied to fan or could they be spring activated and open from pressure.   I originally wanted to put mua in toe kicks, but was worried about cold or hot humid air blowing on cook and not working well with hoods air flow. Also how to access damper and filter box, thoughts.

I’m also installing a Panasonic Intelli-Balance 100
Thank you, Steve