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Grow room design question: exhaust fan placement

BoCoGrow

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The 10 ' x 10' grow room I'm having built in my garage is almost done (finally!). With regards to exhausting air out of the room, the insulated ducting will start at the ceiling of the grow room, route up through the top of the garage and into the attic, and will exit either through the roof or the top of the siding. My question -- as stated in the title of this post -- is where along the path is the ideal location to put the exhaust fan?

I'll be running a 440 CFM 6" adjustable high output fan with a Phat Muffler. My contractor, who does have some experience building grow rooms, is advocating for placing the fan in the attic, so that would be roughly in the middle of the distance from grow room to exit. Does that sound right to you? I'm not suggesting it isn't, I just have no prior experience with this level of setup. What do you think?

Thanks!
 

WeedHopper

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He is totally correct. Thats exactly what i did in Florida. Plus the Exhaust fan noise will be in the attic,,not the grow room. I put mine on bungie cords hanging from rafters which made it much quieter too.
 

RosterTheCog

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He is totally correct. Thats exactly what i did in Florida. Plus the Exhaust fan noise will be in the attic,,not the grow room. I put mine on bungie cords hanging from rafters which made it much quieter too.
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But hung from rafters as @WeedHopper said Much less noise I made the mistake of screwing it to the wood once , sounded like an LZ
 

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