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I have an existing ductless range hood that I want to replace with a new, ducted hood. Fortunately the attic above my kitchen stove is cavernous and easy to run 6" ducting through to vent through an exterior wall (probably less effery with waterproofing than going straight up through the roof).

While I have the skills to do this myself, I'd rather pay a contractor to do it than spend a week picking fiberglass out of my skin and coughing my lungs up from my allergies to the dust in that attic. I learned that lesson the last time I ran something up there. A week of misery isn't worth it to save a little cash I can easily afford.

Would I just go through my usual HVAC contractor, or is there some oddball specialized contractor that I'm not thinking of?

I have an existing ductless range hood that I want to replace with a new, ducted hood. Fortunately the attic above my kitchen stove is cavernous and easy to run 6" ducting through to vent through an exterior wall (probably less effery with waterproofing than going straight up through the roof). While I have the skills to do this myself, I'd rather pay a contractor to do it than spend a week picking fiberglass out of my skin and coughing my lungs up from my allergies to the dust in that attic. I learned that lesson the last time I ran something up there. A week of misery isn't worth it to save a little cash I can easily afford. Would I just go through my usual HVAC contractor, or is there some oddball specialized contractor that I'm not thinking of?

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[–] • 0 pt

That's a bit more CFM than an average domestic hood.

Check the manufacturers literature or post the make and model number here. It should give you duct size, max length, and maximum equivalent length ( total length plus equivalent length for elbows and termination)

8" might be better for noise and performance, especially if you're going to crank it to max at times.

Definitely not 4". That'd be ridiculous.

If you have any gas fireplaces, atmospheric vented gas water heater, wood stoves, or others you'll need to look at makeup air.