Quick question

If you care at all about costs/efficiency don't oversize much if exhausting outdoors. It will cost you greatly on your heating/cooling bill. You will want to run at minimum speed required for keeping your temp and RH.
 
Always attach the filter to the input of the fan. That way you only have to worry about one joint being air-tight, the flange connecting the filter and fan. If you do it differently you run the real risk of venting the grow room smell out your ehaust.
 
Always attach the filter to the input of the fan. That way you only have to worry about one joint being air-tight, the flange connecting the filter and fan. If you do it differently you run the real risk of venting the grow room smell out your ehaust.

That's a bloody good point
 
my 2 cents - loose the cool tube, go bare bulb, fan blowing on bulb, suction out the tent to filter, cool air intake in front of tent. I like to keep anything that doesn't like heat and humidity outside of my tent. MD
 
For efficiency, its better to pull air, and never had a fan go out from exhausting lights.
i had a shop owner tell me something once about fans. said, "think of it as a chain. you pull the chain, it follows, no problem. you push the chain, things are a bit different." i have a fan for my filter, and a diff. one for my hood.
 
I run at 79 18hrs strong right now cause I'm growing up homemade ladders. I pull air from the top of my bulb out the tent through the fan out a 6' run to the filter where it exhausts cooled air over the top of my veg area.
 
my 2 cents - loose the cool tube, go bare bulb, fan blowing on bulb, suction out the tent to filter, cool air intake in front of tent. I like to keep anything that doesn't like heat and humidity outside of my tent. MD
I don't like this idea I had trouble keeping a 400w bulb cool with a wing setup bare bulb
Second I live in australia and the climate is hot there in no cool air to bring in unless I make it aircon
Electricity in aus is about 22 cents a kW
 
my buddy had a hot bedroom in his upstairs. we had the fan pulling air from the room to the outside. it stayed pretty hot up there. we turned the fan so the cool air blew in and it made a huge differance. this leads me to believe blowing air threw the hood rather than pulling it threw is the way to go.
 
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