Installing grow tent vents

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I saw an ad a while back for after-market vents that you can add to your grow tent. I want to add a 4" round vent to my MarsHydro 4'x2' tent. Does anybody know where these are sold or what they are called? Thanks.
 
I want to add a 4" round vent to my MarsHydro 4'x2' tent.
Do you mean cutting a new hole in the tent fabric? Or, using an existing 8" or 6" round vent and stepping it down to 4 inches?

If you want to step down then all kinds of options available at or through any decent grow shop.
 
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