THESE are NOT sized as you hope
I wish I could give them ZERO stars! THESE are NOT sized as you hope. I bought 4 16 x 20 x 4 and they are not that size, but rather smaller! They do not fit my filter space and keep falling down. What good is a MERV 13 lifter if dust can float around it? They would not take them back unless I paid postage- for the size of the box it was prohibitive. NEVER AGAIN and I intend to spread the word!!!