I've been using this type filter almost 3 months, and I've got to tell you that it's a great improvement over reusable filters that I was using. You can see all of the particles it collected...yes, it is DIRTY! I couldn't really see the dirt on the washable ones. I've noticed that there is less dust collecting in the house' big plus! Haven't noticed reduction of airflow nor higher energy bills. I'll continue using this filter...a little expensive to me- but we'll worth it!

[This review was collected as part of a promotion.] Bought the 1900 mpr filters and installed them. After a half hour of operation, I found breathing difficult and noticed a strange odor. Are these filters treated with some chemical? Not happy, considering the price of the filter.

I have used Filtrete filters for years! The 4" filter fits inside the frame of a disconnected electronic filter system that was always problematic. Filtrete filters perform better than the electronic system ever did and provide a superior return on my investment.

Purchased this after some work on air conditioner. I will continue to purchase these filters as opposed to the cheap ones. Improvements in odor, dust.

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!

Put the model 16x25x4 in Bryant furnace, after one run the cardboard retaining material was sucked in and had to destroy it to get it out. As a 3M stockholder I am not happy\.

Been using these for 6 years. They do the job but the 6 pack price has increase 60% in that time. If that rate of increase continues think I'll start looking for an alternative.

[Employee of 3m-filtrete] I am fairly diligent in changing the air filter in pur home. The amount of dust that is filtered out of the air is amazing. Thanks for this great product.

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!

We have been using the Allergen Defense filter for over a year and I have noticed a dramatic reduction is the particals of dust in our house. That means less time I have to devote to dusting the floors and furniture.