17.25x26x1 MERV 13 Pleated Air Filter

FilterBuy is a great resource for an educated selection of just the right size and filtering capabilities. Our MERV 13 filter fit exactly into the input slot of our Lennox Signature furnace/A/C system. With all the wildfire smoke lately, we at last have noticeable relief during those days with dangerous AQI ratings. This filter, with its 3 month life, saves $$ and, more importantly, time formerly spent on my knees each month vacuuming out the plastic mesh filter that came with the system.

Finally! A high-quality filter that fits snugly. The cheaper ones just weren't doing the job and Filterbuy's filters are reasonably priced.
I'm a loyal Filterbuy girl from now on!

Perfect site to find those hard to find filter sizes. Quality is great, website easy to navigate, and shipping is quick. Go for it, you’ll be pleased you did.

My furnace uses 17.25x26x1 which is a hard to find size. I'm not sure why all manufacturers call their filters 1" thick when they are actually 3/4" thick. I ordered the Merv 13 series and the filters fit perfectly. I am quite impressed on how well built they are. The filters arrived promptly and packaged well. If you factor the Free Shipping into the overall cost, the individual price is acceptable.

Filter was not 1" thick, but 3/4" thick.