Originally Posted by deprecated
Unfortunately I have a very long run of duct (30 feet) with two 90 degree elbows. The two elbows are within the first 5 feet of duct (from the fan). Flex-duct might be a better option since it would allow less drastic angles.
I'm going to mount the fan to the hood or very close to it. The way the duct runs I will be able to add an inline booster fan if needed just before the last 15' of duct.
Ordered the fan yesterday and will pick up duct in next day or two.
garbageman, I'm pleased with how the hood came out but I did neglect to put any sort of sealant or adhesive between the FRP and edge of plywood endcap where I screwed it down. Not a big deal but that's the only thing I might do different if I were to do over.
I wouldn't do flex duct. Whatever duct you use will result in some condensation. If you angle a rigid duct it will all roll downhill and you can plan for it to escape. A flexible duct will trap water in all of the corrugation and well that could get funky overtime.
Just make sure you have a powerful enough fan to handle the ductwork and you should be fine. At least that is how I would address it.