NORTHWEST ENTERPRISES Vent Filters Media Roll, 25ft x 12in x 1/8in Cut to Fit Vent Filters for Home and Business. Electrostatic Air Filter Media Roll for HVAC, AC & Heating, RV's, Mobile Homes & More.

I bought this to create an in-window evaporative cooler, so we don't have to run our A/C unit, which takes ~6 kW, whereas our two box fans take about 80 watts total on medium speed.I went to Home Depot and got some LeGrand CordMate cord channels, and some small metal rods 4' long (slightly smaller in diameter than an extension cord's diameter). I cut the filter media into 38" long sections, then lined up the top of the filter media with the cord channel, then pressed the metal rod into the slot of the cord channel, trapping the filter media in the cord channel. I overlapped the sections of filter media by about 3" to get 38" width. The window screen is 36"x36", so the filter media covers the entire window screen. I used scissors and an X-ACTO knife to cut the cord channel and filter media to 38" width.Then I screwed in two small open eyebolts outside the window, and hung the metal rod on the eyebolts.Then I pounded in some 5' stakes and zip-tied misters to them, two for each stake, one near the top of the filter media, one near the center. I used 3 stakes, so 6 misters total per window. Two windows, so 12 misters total.You can order the misters on Amazon, but the brass mister heads that come with the misting systems are junk... they don't spray well and they clog quickly with mineral deposits. I got some stainless steel mister heads that screw in to replace the brass mister heads. They work well with standard water pressure, the mist is really tiny droplets (so small that none of it hits the ground except at night when relative humidity is high, and in fact, on a hot day you can see the mist coming off the mister head and convecting upward (humid air is more buoyant than dry air)), they haven't clogged yet, they only put out ~0.25 GPH each, and cleaning them is as simple as unscrewing them, dumping them into a bowl of vinegar for an hour, then rinsing them off. Maybe brushing them with an old toothbrush if they're really coated with mineral deposits, but that's it. I haven't had to do that, as the water goes through a 400 GPD reverse osmosis unit to remove most of the mineral content. The RO waste water goes to water the yard (which we have to do anyway, so we're essentially getting the cooling for next to nothing).I positioned the stakes so one was on each side of the window, and one right in the center.I positioned the misters such that the ones on each side of the filter media sprayed parallel to it, across the filter media, to create a fog outside the window that the fan sucks in. The ones on the stake in the center of the filter media I aimed directly at the filter media.So it's 102 F outside right now, and inside is comfortable. We've hit 110 F before and we still haven't run our A/C unit yet (except for once to test it after I cleaned it and straightened the fins).I was informed that this sort of system wouldn't work in Texas because it's "high humidity'... except relative humidity (RH) decreases as temperature increases, so as the temperature climbs, the evaporative cooler works better to cool the air. In the morning, our RH is ~75-85%, but as temperature climbs, it drops to ~20-40%.So the two box fans, running on medium speed, take only 420 watts more power running all day, as the A/C unit would take running at 25% duty cycle for an hour. This month, we've only used ~12 kW per day for the entire house. It would be approximately triple that just for running the A/C 24/7 at 25% average duty cycle.And the total amount of water we're using is ~72 GPD. Water is cheap, electricity is expensive.

At first I thought this was not going to work, product is very thin but I didn't want to return it so I place it on all my vents. Easy to cut and to install the roll is big you will not run out any time soon. I did notice that that dust has minimized around the house, also the large HVAC vent filter does not need to be change as much. Hope this helps and yes I would purchase it again.

Perfect thickness for our return vent on our RV. Cut to size.

Worked perfect for our rv filter replacement where you need really thin filters.

Excellent optional filtration for our mini-split A/C system that's in a dusty area without jepordizing the system performance.

My go to was out of stock so I went with this. The thickness is inconsistent throughout the roll. There are places where it looks like there was too much material and it was bunched up and melted into the sheet making that part unusable. I will use what I can but I won't buy this again.

Great solution to dust issue in my shop.

Though pricey its worth the cost. Have been installed for a week and we already see a huge improvement with indoor air quality. Looking for others ways to improve our system using Northwest