Well-made, top-quality, perfect fit, excellent filtering. Fantastic price. Purchased a years worth.

> Well constructed. I've had no problems using these for probably 10 years or more.> In my opinion, the MPR 1500 filters are a good compromise, filtering out household dust, pollen, fungus spores, pet hair (i.e., most allergens), and are moderately effective in filtering out bacteria and viruses.> If your main concern is pet hair, then a lower MPR rated filter might be a better choice --- reducing your cost and reducing the frequency you need to change the filters. (Some reviewers claim that they have to change the filters weekly). If you have NO problem with allergens (or perhaps live in desert states), then a moderately lower MPR rated filter might be more cost effective for you.> Higher MPR rated filters (i.e., >1500 MPR) are more costly, and probably provide little improvement in air quality, unless you have someone in your household with a contagious infection; or an individual with a highly compromised immune system --- or other special situations. Higher MPR rated filters may reduce airflow though your AC condenser unit (especially as they clog up more quickly), which may translate into slower cooling, and higher energy consumption.DISADVANTAGES OF LOW MPR RATED FILTERS> Moderately high MPR rated filters (such as 1500 MPR) filters catch most of the material which would otherwise mat-up on the water film of your condenser, reducing its efficiency, which may translate into slower cooling, higher energy consumption, or shorter life of the condenser unit. In hot humid South Florida summers, this is a serious concern -- the dust, etc. that can gets through cheap AC filters mats up on moist condensers, ultimately clogging the condensers, reducing the efficiency of cooling, and therefore increasing your electrical power costs. It cost several hundred dollars to have your condenser cleaned by an AC technician --- which you'd probably need to do yearly (at least in South Florida) if you used the cheapest AC filters (say, less than 300 MPR).> Have you seen all the ads for cleaning your airducts, mostly to remove fungal spores? At probably $500 for a typical home? Better that the spores don't get to your ducts in the first place (i.e., if you use moderately-high MPR rated filters). Cleaning might work if you have sheet metal ducting--- But I (and many other people) have ducting built of insulating sheets, which are porous inside --- and I don't believe that significant cleaning (certainly not removing fungal colonies) is even possible. So, I chose what I judge to be the highest practical MPR rate filters (i.e., MPR 1500).BOTTOM LINEI believe that moderately MPR rated filters (e.g., MPR 1500), changed moderately frequently, pay for themselves in short-time electric bills and long term maintenance costs.SCHEDULE> A three month schedule works well for me. After 3 months, the filters are retaining alot of material, but are not clogged. In some seasons, I might be able to stretch to 4 months, but I stay on the 3 month schedule.> I suspect that reasonably frequent changing of the filters pays for itself in lower electrical bills (because the AC doesn't have to work as hard with clean filters). But what is "reasonable" can vary greatly from household to household, or region to region. I suggest guestimating your schedule, and when you change your filters, inspect them, and adjust your schedule accordingly.

Muy buena calidad de producto, solo que avece llegan un poco maltratado de la orilla, pero no afecta

Calidad

It's working great to reduce the amount of dust in our house. The product says it can last up to 3 months, but it seems like we need to change it every month or 1.5 months -- which isn't a big deal for us.

Llego en excelente estado

Seems to be high quality but hard to tell really.

I've always used this type of filter for my ac unit. I'm also the kind of person that forgets to pick one up when I'm shopping which means my ac filter doesn't get changed as it should.I found the price to be at least $3-$5 less than what I pay at either Home Depot or Target plus with free prime shipping you can't lose!!