I I am an auto re-fill every 2 weeks to remove the drug smoking from my neighbor's townhouse which burns my sinuses and gave me walking pneumonia. Works as I had hoped! Thank you Filterbuy
Theres no way to really know if the filters are MERV13 or not. No markings on the filter, just a slip of paper in the 4 pack. I expected the filters to be more rigid. Some of the cardboard framing was crushed, affecting the filters rigidity. Regarding performance, the jury is still out.
My furnace was listed as one that would use this size, and it was slightly too wide. The service man doing the six month check suggested the Honeywell brand would fit better. I used the smaller size previously and, while it would fit in, it rattled a lot. The rating would change if the 5 inch had fit.