Cutting hole in ceiling for extraction. Also where to get air in from?

Orblight said:
Thanks I'll try go a little smaller than the duct and see if I can still pull the duct through.
Still need to check for wires. I think there's abut of air exchange up there it's just a tile roof and I felt a small breeze when I stuck my head up there.
Your right there's a good chance it will breath enough by itself guess I'll find out once there a extraction in the room.

Good idea with the window if it doesn't breath enough, if not just a floor board.
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If it gets cold where you live do not dump hot moist air into the attic, at least run the duct to the soffit then vent out, that attic will be dripping an moldy in weeks if outdoor temps get to freezeing or below
 
drumrol said:
You don't need a filter unless you are concerned about the smell. I just blow unfiltered air outside, no neighbors:-)
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My closest neighbor (1/4 mile up rd) just happens to be a K9 cop. He doesn’t visit or anything but….better safe than sorry. Especially since it’s illegal here. So carbon filter it is
 
Doggonewild said:
i vote for sending it under the house intake and extraction of heat its worked for me years keeps my pipes warm too
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The grow room will be under the house as well. You think I could extract air out of tent to one end of crawl space and pull fresh air in from another end while using a dehumidifier? There would be a distance of 35-40 ft between the air “dump” section and the intake. I’m having trouble figuring out how to exchange air without any vents in crawl space. And I need to keep ducts concealed if possible.
 
that heats gotta go outside or u need a shit load of cooling(AC) an a big ass dehumidifier currently where i live its almost cheaper to just buy the weed if you gonna have to pay for all that electricity but even outdoor weed gets me high as f after half a J i might be bias i work too much to have a high tolerance
 
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