Air Duct Screen and Carbon Filter for 4 Inch Ducts; Atomic Innovations

If you live far away from any city ,like I do,chances are you have a septic,and your septic has a vent {or else it wont work}. Well we don't want that ,but every so often that vent will remind you what it's attached to, PHEW in no uncertain terms PHEW !!! Most vent pipes are 4in, which is great because this item is just the right size for the job.. If your vent is straight out the ground with a PVC rain cap you're in luck ,2 90 degree elbows to make a "gooseneck " is even better,and one 4in coupling to join the elbows together. These fittings you can get on Amazon along with a bag of. fish tank granulated charcoal and a charcoal pad type filter. Bear with me we're almost there. Disconnect the last elbow,{or buy2 if needed} insert the 4 in duct filter into the bottom leg of the down pointing elbow ,and secure with 2 screws 1 per side, use an elbows to press down on the charcoal pad, and cut out out a 4in circle. Now its assembly time , pour the loose charcoal into the down pointing elbow, ,press the pad circle on top of the loose charcoal and reassemble the gooseneck ,add 2 more screws to the joint where the elbows are joined and you're assembly is complete . The triple dose of charcoal will tame even the most ferocious, exotic "fragrances" Lastly you can replace the mat circle and the granulated fill when your tank is pumped or recharge it by applying heat with a hair dryer. NOW you're done. PS it took longer to write this, than it took to do it.

These are perfect. I p[laced it in the duct work of my grow tent. Helps keep my home smelling fresh. Very easy to install and made out of good materials. This filter gets an A for all around usefulness. I will be buying more, a lot more.

Well made and works to filter intake air. A bit pricey but it works.Probably wouldnt buy again at the price point.One positive is the rivets can be drilled out to replace the filter material.Just need three screws.

Fits on ducts like a charm. Does what need it for. Does what it’s supposed to do. Happy I found what I was looking for.

Not a standard size for what I was looking for made it work

I have this connected to a 4” x 20’ long hvac hose with an extractor vent to purify the air when I smoke my cigars. It does the job for me. The only trouble I had was installing it to a 4” air duct. It fits very tight. I wish it was around 3.95” so it can slide right in without having to force it inside the vent.

This thing is indestructible! (given the nature of its purpose of course) very durable, and works like a charm! I highly recommend this product for anyone wanting to clean up the air intake/output of their project. 10/10 I will be buying again!

It doesnt let thevent breath and i have it attached to the blower directly and its smothering the air i need sumn to filter but still let the cold fresh air in wtf im not happy with this product at all i would like to return for something else please or refunded