It's hard to know how good a filter is just by looking at it. These look pretty basic and pretty much like the filters I had been getting from my local furnace guy. Those were only supposed to last a month, and you are saying these can last 3 months. I wondering if I should have purchased one of your higher end filters. I do have a basement workshop. the filters are used in geothermal system with a water furnace. Any recommendations would be useful.
It is very hard to find a 14x14x1 air filter that actually fits my 13x13x3/4 ceiling vent. Thank you, thank you, thank you!!! I will always buy from you.