I use 16x20x4 inch MERV 12 filters from Filtrete because they have the best build quality of all the filter brands I have used. I just have an issue with the vague MERV rating for a particular filter. Filtrete uses their own rating system (1550 for example) and then I have to do some research to find the MERV rating.

Excellent air filter. I buy these 20x20x1 sizes and tape them to a regular box fan for a quick, easy, and affordable air filtration unit that I can move around the house wherever/whenever I want. No need for any special high end unit that requires a unique filter that some company stops supporting.

[This review was collected as part of a promotion.] I had an electronic filter system that i removed because stopped functioning and replaced with what is easier to maintain .I don not have to wash the filter using any chemicals and is safer for the environment within the house.

I've been installing this filter in our furnace since it became available. It not only produced a cleaner home interior (our house was built in 1913) but also keeps the motor/fan and its enclosure cleaner thereby saving major and expensive mechanical furnace repairs/replacements!

My HVAC of 30 years brother told me to purchase these filters vs the little 5 pack ones in order to cut down on the allergens and dust in the house. Monthly I would always change the cheap ones too, but let me say that this Filterate filter is really helping our allergies and furniture dust. I plan on always using them now but often the local is sold out of them. But eventually I get one. I like that there is an area for you to write the installation date on the filter and then take the provided sticker and stick it to your calendar for follow-up.

I use these in place of regular HVAC filters. The 4" depth adds surface are which reduces air flow resistance. My home systems for people with breathing problems includes multiple 20 x 20 x 4 inch filters. My 2400 sq ft home has 5 filters. The efficiency of the HVAC system is not degraded yet the air is best for sufferers of breathing problems such as asthma, RADS, or allergies.

I bought the 4" filters for the first time in the fall. It is worth the price difference. My unit is up in the attic so getting up in the attic is a pain. Now I only need to change the filter every 3 months and it really helps with the dust in the air.. The air quality in our home has really improved.

I bought this product because it was the right size to replace my Electronic Air Filter, that had died. I installed it and all seemed well. After about 1 month I noticed the A/C unit was running continuously and the temp in the house was going Up. I noticed that very little air was coming out of the vents. Turns out that the filter material had sort of Swollen-up and cut the width of the 'pleats' by more than half. Basically, it was like having a 30-day filter in your furnace for a year! After de-frosting the unit and mopping up all the water, all is now normal with a different filter. I would like my $30+ back please!

[This review was collected as part of a promotion.] I just replaced my furnace this last month and decided to go with the new upgraded system that included a 4" filter. Due to where I live and having open fields by my home my filter gets dirty very quickly with the wider filter I do not have to change the filter as often as the smaller one.

I've been using pleated 3M filters in my furnaces since I built my home in 1996 . I have gradually upgraded to higher MPR ratings as they have become available and am now using the 2800 healthy living filter in both of my systems . I'm extremely happy with this product and both subjective and objective findings suggest that these are high-efficiency filters . As an allergy sufferer I've noticed greatly diminished symptoms and moreover surface dust on furniture is much reduced . I also have a Dylos particulate counter that confirms much reduced dust levels. I was initially concerned that the 2800 filter would clog more readily and need more frequent replacement then the lower rated filters . This has not been the case however , as airflow remains excellent which attests to the high capacity of these filters .