I love the idea of cleaner air, but my furnace company told me I needed to change the setting on my furnace when I use a higher quality filter such as this one. This was unexpected news.

I've tried a lot of different filter makers. The Allergen Defense 1200 made a HUGE difference in just 6 hours after I installed it. My headache went away and the nasal drip stopped! I'm a true believer in my improved health!

Space between rails in Lennox furnace for their 5” filter is only 4 7/16”. The filtrete 5” filter is 4 11/16” thick. Going to try filtrete 4” filter that is 4.31” thick.

We have been using these for years, living in Florida and believe that these filters keep down the amount of pollen from outside and dander from our 2 dogs inside.

I have asthma and allergies. I have used Filtrete for many years. There is a noticeable difference in air quality while in use. Just wish they were a little less expensive.

[This review was collected as part of a promotion.] Best filter I've ever bought! This filter is worth the extra $. I notice less dust/particles in the house and when I change it, I can see it is picking up more than other filters.

I've used various filters and found this model to be very effective. Amazed at what it actually catches from the normal air. Noticeably helps during the allergy seasons (severe hayfever).

[This review was collected as part of a promotion.] Does a great job. does a great job

I need a 18x20x1 1900 filter but Filtrete doesn't make one, settled for a 1500 but not satisfied. Found an Aerostar filter and an evaluating it, but would prefer Filterate for good quality control and honest rating assessment.

This filter removes all of the smells we've gone nose blind to over time. The other day I cooked some fresh fish and ran out for an errand. When I came back I could not tell what we had for dinner. Can't say the same at my neighbor's house!