Vent hood -- placement of backdraft damper
I'm installing a Broan hood with a rooftop blower. The blower has a backdraft damper on its output, but Broan still indicates in the spec/instructions that one should be added inline.
The most convenient place for the damper would be immediately attached to the hood. For one thing, I could verify operation (and change spring if necessary, adjust, lube) by removing the hood baffles for direct access. The only reason I can think of for not putting it there would be if the flappers would result in more air turbulence noise if placed on the hood exit than if placed a bit further up the path.
Any experience with this?