CFS – Pack of 1, Universal Cut to Fit Carbon Pre-Filter Pad Roll for Air Purifiers, Furnace Filters, & Air Conditioner Filters – Fresh & Filtered Air for Indoor – Charcoal Air Filter Sheet – 16"x48"

This was great, just what we wanted for our window air conditioner unit, we wanted to make sure that there was an extra filter one of our pets has asthma. So far this has been great, no smell, can cut the item to fit the size of the unit. This is also easy to clean and I feel like it's a great product, thick material.

Air purifiers have gone up a stupid amount, like so many other things. We were about to just go without having one, but I wanted to make a last ditch effort to find filtration media we could cut to fit our old model. It cut easily with scissors and wasn't difficult to press into place. Triple-layering this makes for very clean smelling air and an easier rinse of each layer as needed. Now we have it running in our nursery 24/7 and we're all breathing easier. We'll be back to buy more! Thanks!

Slightly thicker than i needed but works well.

Works well for filtering toxins / dust in our RV

Works as intended. Deep cleaned my fan, gross nasty dust in it, hopefully this will reduce that amount. Added some tape and cut to size. If Furnaces need filters why not fans that are not so easily cleanable.

Really nice

I bought this to filter our vents for our furnace. But it is to thick for this use. I'm sure it would work great for other types of Ir filters or cleaners. But the furnace has to work to hard to draw air through the cold return and this material is to thick for heat vents in my opinion.

I could find a pre-filter to fit my 20 yr old air filter so bought this. It works as promised and was easy to cut to size.