Filter King 20x23x1 Air Filter | 12-PACK | MERV 13 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 19.5 x 22.5 x .75"

I actually ordered a 12 pack of filters and was sent the wrong ones. When I called, I was told they would send out the correct ones and throw in an additional 4, which they did. I would give them an A+ for customer service, but a C for shipping the wrong product the first time. And, another C for sending me a survey about the 4 air filters I purchased, when I actually purchased 12. The 4 they are referring to are the ones they sent free due to their error on my original order.

Oddball size not carried by any of the locals, including 2 major chains. Fit perfectly and will save me a ton of duct tape that I used to make others work.