Filter-Monster Branded Replacement Pre-Filter Pad Pack Compatible with IQAir PF40 Coarse Dust Pre-Filtration Kit, 5-Pack

Great pre filter to extend the life cycle of other expensive IQ Air filters.

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fits perfectly GREAT PRICE FOR PRE FILTER FOR, AIR IQ PRO.

I have expensive air purifiers and found out the charcoal filters and drums cost as much as a new machine. I really that I can cut these and put them in place of the actual items and it does filter the air. I will definitely bought some again on the future.

It was fine looks just like the one that I bought direct from the company!

As another reviewer has said, these are thinner than the one made by IQAir. They also don't seem to have a rough side as do the ones made by IQAir. I did purchase another generic brand before, and they were better.

As I opened the package, I noticed the filter is not made like the others I have used. They are flimsy, even though I know they are supposed to be that way, but the finish on one side is basically the same as the other side. The originals have a different texture thus, a more efficient filter. I also find the offbrands such as this one are always a 1/4 inch off on the sides meaning it doesn’t cover the bottom of the air filter.

This product is much thinner than what I had hoped. It is not equivalent to IQ Air filters, which explains why they are cheaper.