(4 pack) Imperial 4-inch x 12-inch Register Filter, 12-pack

If you have an air system with register vents these aren't just something that you might want but something in my opinion that is needed. I put these on my registers and when I went to replace them I couldn't believe the amount of dust that they trapped and kept from getting into my air. These do not work for fine particles but that's what the filter is for at the air handler. But these keep some of the dust out that might be in your system. That being said i have my ducts cleaned regularly so they were already clean to begin with, it was surprising to see what they captured. Who would a knew. They don't seem to hinder air flow at all. As long as I have a duct system in my home I will be using these from here on out!!! Anything that I can keep out of my air is a win to me. I should also mention they are pretty easy to install. I carried around a tv tray with me to all the vents and a pair of scissors and small trash can. That way I had a surface I could easily work on. I cut each one to fit on the spot. It wasn't too difficult to get them to slide in. I have a mismatch of registers and some were easier than others. Definitely worth it, I highly recommend!!!!