[This review was collected as part of a promotion.] I've been using these filters for several yrs and they are great. I originally bought them because my son has asthma.

So far so good. I can't really tell a difference after a week. We recently moved into the house and I am not sure how old the other filter was. I've never bought such a large filter either. No complaints about it.

Just had a high effiency furnace installed last year and have a new 4" filter system. It does a great job and I have wonderful air quality in my home.

Even if you don't run or have a whole house fan unit buying the 12x12 is a great way to a cheap air filter. Just tape a 12x12 Filtrete onto the back of a box fan and you're good to go!

This air filter does a better job of trapping all the junk in the air of our house. It located in a very clean walk-in closet and we're at what it catches. Its especially effective during the spring pine tree pollen season

My family has allergies to include to dust mites, etc. Using this filter has had a noticable difference in their health/feeling around the house. Thrilled that I got them and they keep the air nice and clean!

I tried the Allergen Reduction Filtrete filters and they really seem to help with my husband's ragweed and mold allergies. I am pleased with the product, although they are pricy, they are worth it for his well being

I love things that just work. You know; Do exactly what they're supposed to do. These filters do that. In the country, one cat, and clean fresh air. Not to mention clean and efficient work load for the central heat and AC unit. Thanks Filtrete

I've been using the Filtrete allergen filters for over 8 years in my forced air furnace/AC unit. I can breathe better and the house has reduced dust. It makes for easier cleaning!

Remember these filters are for Standard size Returns. However there are HVAC companies that deliberately use Grille size Returns to make a customer buy their filters. GRILLE SIZE Returns are slightly smaller than the Standard counterparts.