VIVOSUN4 Inch Air Carbon Filter Smellines Control with Australia Virgin Charcoal for Inline Duct Fan, Grow Tent, Pre-filter Included, Reversible Flange 4" x 12"

This is a game changer. Looks amazing and the build quality is top notch. the air flow is great even with the sleeve on it. this isn’t the cheapest filter on the market but you pay for what you get, and this speaks for itself. I use this to get rid of the smell of my plants and it completely eliminates the odor. however i actually bought a second one to use for my soldering station to filter out the lead smell and possibly particulates from the air above my work station and it seems to be doing the job perfectly. this not the cheapest, but certainly the best 4 inch filter on the market.

I bought this for my indoor garden. Runs quietly, filters the smell, easy to clean. The cover can be washed,. Excellent service.

works very well

With an inline fan and a little overkill we use one in the living room during west coast fire season to scrub and refilter the air. I wish I could recycle this somehow.

This really works and well too.

We got this and within less than one week the filter was covered in dirt and whatever else was in the air. We have taken it off a few times and it's super easy to wash and put back on. Very easy to put together and put onto the wall.

So for starters, I am using this with a six inch inline fan connected with a reducer fitting to make a DIY air purifier, I have no idea how this performs with the 4 inch fan as I assume that's what most people pair this with.My purifier is an extraordinarily basic design, but it is the activated charcoal in it that really makes it special. It has been able to filter just about any bad smell/VOC I've come across and has cleared my 300 sq/ft garage of spray paint fumes in less than 10 minutes (granted the small door was open but I was still impressed). Also I painted the closet in my bedroom and neither my girlfriend or I could smell a thing sitting barely 10 feet away when we had it between us.So this filter really works as far as I can tell, sadly I do not have any air quality monitoring devices on hand to make a confirmation. I'm not entirely sure how to check if the charcoal needs replacing so I can't say too much about longevity just yet, however I have been using my home-made air purifier almost daily for a good 4-5 months now and it seems to still be doing a pretty good job. With how much I use spray paint, epoxy, and solvents I'm fairly impressed it's helped protect me from all the breathing buddies for this long.

On my second one. No issues.I like being able to invert the ends for a little more longevity.For my non-standard use, I run a duct from my above-the-oven microwave, through the top cabinet, onto the top of the cabinet where it sits. Magnitude more charcoal filtering going on. CFM rating is much higher than the microwave, so I do not believe their is too much back pressure on the fans. Filtering of cooking odors is significantly better in my condo! I have not been able to devise anything close to this good for filtering cooking smells in my condo. Surprised there is no commercial kit/product catering to microwave owners in my situation.