We've been using Filtrete Ultra Allergen Healthy Living filters for the past three and a half years. They keep our house literally dust free and fresh. We have two cats as well and appreciate the advantage of having good filters in our furnace that we change every three months.

Outside, air quality was 300-1100 (off-the-scale and very hazardous) with smoke hanging in the air like dense fog. Inside, the indoor air quality monitor says the air is very clean (AQI 23). This is with running the furnace fan continuously and changing filters every 3-4 weeks. The only downside is the smart filter feature doesn't actually know when the filters are dirty, only how much air volume has gone through them.

We used Filtrete furnace filters for years. A few months ago I made the mistake of being talked into trying a different brand because they were cheaper. What a mistake! The other brand jammed and bent when trying to insert it in the furnace and it simply didn't trap the dust like a Filtrete. Needless to say, we will only purchase Filterete brand filters in the future!

After changing my regular pleated air filters with these, I essentially was able to come off of allergy medicine daily. I used to get allergy shots. Now I very rarely get an allergy flare up. I highly recommend allergy sufferers get this filter. I hesitated beforehand too but thought what do I have to lose.

Bought 1 4" airfilter that ended up being 5". Thought it was a fluke and took it back to the store. Went to another store and the only brand availabel was 3m again. Bought a 4" filter and once again measuring in at over 4.5" and does not fit. Last time I buy from 3m. Btw our furnace can fit 2, 2" filters perfectly but not 1, 4".

My family and I moved into our 2800 square foot house in Minnesota almost two years ago. The filter that was in the furnace was not a 3M Filtrete filter and it was disgusting. I bought this product because it was the only filter of this size offered at the store where I bought it. I thought it would be a good deal considering it said that it would last up to 12 months. I'm no dummy, I know that when something says that it'll last up to any amount of time, that time should be cut in half under "normal" Minnesota conditions. Cutting to the chase, this product doesn't even last 3 months, and that's in the fall when the furnace fan never runs! We even had our ducts cleaned before installing our last filter. The product definitely works because of all the "stuff" trapped in it, but for a product to have a label on it stating that it will last up to 12 months, it should at least last 6 month in Minnesota conditions. I would recommend this product to anyone, however I would have to warn them about the replacement period being so frequent.

[This review was collected as part of a promotion.] I have used this 4" filter since replacing our furnace (used 1" Filtrete filters before this). Love how it cleans the air, especially since we have 2 Balinese cats. The only "con" about this filter is how hard it is to remove from the furnace. I finally figured out a way to attach a string to the front of the filter so that it's an easy pull-out when it needs to be changed. Perhaps Filtrete could come up with something like this, or 2 finger holes for easy removal.

The way our air system is set up, we have a 1200 filter installed just under our unit, but we also have another filter mounted in the door. The air is sucked in through the door filter first and then up through the one in the unit. We LOVE this set up and we LOVE using Filtrete filters. With my husband's asthma and allergies I don't know what we would do without them! Thank you Filtrete!

[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.

Bought this yesterday, installed today, it is about a 1/2 inch bigger than the filter it is replacing. Had to force it in the inlet opening, have always had to change my filters every 2 months, I hope this will last longer. and this is just a 2 year old house, and we had the furnace vents cleaned out earlier this year. I am impressed with the fact that the filter uses cotton versus paper as it filtration media.