FAN HELP PLZZZZZ

i just bought one of those 4 1/2" computer fans i have mounted it on my box but i also bought a 25 foot metalic flexi hose {like everyone else is using} and it is 4" in diameter how do i connect the hosing to the fan(what kind of materials do i use?) so i can complete my exhaust system. ALSO i have that at the top of my box once i make the exhaust system there will be no light showing from that hole......but i have a hole at the bottom to suck in air(no fan just negative pressure method) Is there any kind of screening or ....damn ANYTHING that i can use to block this light without affecting air flow. Any help is so appreciated.thanks

duct tape is a wonderful product for lightproofing and connecting tubing. also for the intake vent just put a length of tubing on it with 2 90degree bends. light cant travel around corners. as long as it isn't reflective inside the tubing. if it is paint it black 1st. it's called a light trap, if you don't understand just think of the trap under your sink, same idea. also a 4 1/2 inch comp. fan is not powerfull enough to cool much more than 1 or 2 42 wat cfl's. i originally tried a 4inch fan to exhaust my 350watt cfl cab and the temps were like 115 or higher! i had to switch to a much more powerful fan. just make sure you run it for a day or 2 and watch the temps before you put any plants in there. when i upgraded the fans i switched the 4 1/2 inch fan to intake also.

should i paint it flat black???what kind of fan for exhaust do you recommend i have some money but not a lot so haha. but yeah i watered earlier and it was hot in there and there were small black flying insects do u know what these could be

Hey guys,

Another neat idea I read about for making a light trap with a flexible hose:
Attach your intake/exhaust side to the cabinet/room/box... then, make a 180degree smooth bend in the duct... simple.

(did I write it right?)

thats typed right but maybe yall can help me i put the box in the attic and the door is unlevel now so light excapes from the door the4 1/2" fan hole which the fan is on and the 6"x6" hole fort intake at the bottom but yesterday i bought a 25' flexi hose so maybe you guys can help me out because right now im way too drunk and high to know what to do and im getting pests in there now so its even harder..thank guys

i went to HD a lil while ago and was looking on the flexi hose aisle and found a 6" in-duct fan that blows 250 cfm is that good or too high for such a small space also would it be to loud because i have to grow stealth.if i get that all i have to do is return my 4" flexi hose and get the 6" instead. THANKS

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Originally Posted by HungryMcNasty

i went to HD a lil while ago and was looking on the flexi hose aisle and found a 6" in-duct fan that blows 250 cfm is that good or too high for such a small space also would it be to loud because i have to grow stealth.if i get that all i have to do is return my 4" flexi hose and get the 6" instead. THANKS

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that would be great. 250cfm's should get the air outta there long before it has a chance to heat up

hell yeah then....thanks a lot justaseed and turtle yall help me out a lot and we all know how these kind of things can be frustrating