Badly made, the end of the filter allows the air to pass through one side and I did not filter correctly! I will start looking for another filter provider that offers me better quality!
I am no longer a customer of your firm.You don't allow me to buy filters, I have to subscribe and then you ignore my cancellation emails and ship anyway.You are done.
Filter is not actually 20x20x4, it doesn't fit snugly in furnace filter area so a lot of dirt does not get trapped. Disappointing as this is a hard size to find.