to start off, this is an idea i was lucky enough to see on OG before the big bang, i tried it and it works for me. i cant remember the original poster or who the props should go to but i would like to personally thank them for this idea. this is my rendition of the mod.
ok this is how to mod a stanley blower fan for cool tube and heat extraction. first i disassembled the fan case. i then removed the rivets from the 6" starter collar, squeezed it together untill it fit snugly around the outside of the fan grille appx 5". push the starter collar tabs through the grille and bend them over so its attached now. reassemble the fan case and i use 4" cool tube duct so i riveted a reducer 5"-4" onto the starter collar(can use duct tape) now its all secure. this model fan pulls air from separate sides so the one side that has the duct can pull heat from the cool tubes, the open side can be used to remove heat and stale air from the room. a 6" flex duct is taped to the output of the fan and runs to my DYI carbon filter in the attic. the mod side pulls air through about 10' of 4" ducting and two DIY cooltubes with two 400w HPS bulbs and sockets. im currently only using one light but they are setup so later in flower i only have to plug the other one in.
this keeps a negative pressure enviroment in a 5x5x8 closet with no problems. as far as noise, you can hear a fan blowing if its in the same room even if you couldnt see it. i hung mine from the roof with bungie cords and i cant hear it from another room unless i put my ear to the wall but it still only sounds like a fan, not some marijuana making machine. lol
ok this is how to mod a stanley blower fan for cool tube and heat extraction. first i disassembled the fan case. i then removed the rivets from the 6" starter collar, squeezed it together untill it fit snugly around the outside of the fan grille appx 5". push the starter collar tabs through the grille and bend them over so its attached now. reassemble the fan case and i use 4" cool tube duct so i riveted a reducer 5"-4" onto the starter collar(can use duct tape) now its all secure. this model fan pulls air from separate sides so the one side that has the duct can pull heat from the cool tubes, the open side can be used to remove heat and stale air from the room. a 6" flex duct is taped to the output of the fan and runs to my DYI carbon filter in the attic. the mod side pulls air through about 10' of 4" ducting and two DIY cooltubes with two 400w HPS bulbs and sockets. im currently only using one light but they are setup so later in flower i only have to plug the other one in.
this keeps a negative pressure enviroment in a 5x5x8 closet with no problems. as far as noise, you can hear a fan blowing if its in the same room even if you couldnt see it. i hung mine from the roof with bungie cords and i cant hear it from another room unless i put my ear to the wall but it still only sounds like a fan, not some marijuana making machine. lol