blocking light through your fans

im building a nice little box but need some ideas and or info about how to block light through your fans? im using a small 80mm fan im assuming just mylar but is there anything else i dont want to constrict air flow any input would b nice thanks..

not an expert but i heard ducting that has black on the inside in sorta a little bit of a curve shoud do the trick like maybe a foot or two. shouldn't cut down to much on air flow

Nah I can't hook ducting up to it nor do I want to to b honest I'm looking for something flat I just didn't want to buy entire roll of mylar for a 2 inch hole ya know?

Kart0oN said:

Nah I can't hook ducting up to it nor do I want to to b honest I'm looking for something flat I just didn't want to buy entire roll of mylar for a 2 inch hole ya know?

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Black speaker cloth works wonders, really helps kill the light and still allows for air flow.

^ ditto. might dubble it up

i was shown this and never looked back

https://www.icmag.com/ic/showthread.php?t=135524

or the replacement carbon filter pads.

some good ideas thanks guys i think i might go with the speaker cloth due to the fact the whole is only 3inches big and round so that would probably be my best bet much appreciated.

I like this idea, but where would one go in north america for speaker cloth?

HippySmoke said:

I like this idea, but where would one go in north america for speaker cloth?

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thrift stores, buy old speakers with black fabric, bust 'em up be merry

if you want something made for the purpose, do a search for back draft shutters : http://au.alibaba.com/product/368687812-Back-Draft-Shutter-Match-For-Duct-Fans.html might cost a bit more if you're ordering less than 3000 mind !

Mogwai5 said:

if you want something made for the purpose, do a search for back draft shutters : http://au.alibaba.com/product/368687812-Back-Draft-Shutter-Match-For-Duct-Fans.html might cost a bit more if you're ordering less than 3000 mind !

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that reminds me, darkroom vents will work, and they come in round shapes. something to keep in mind.

had the same problem
made a 'duct' from aluminum foil, you can easily build any shape
works like the proverbial charm