The 19in by 19in filter was actually 20 7/8 by 20 7/8. A sticker on the frame said 19 by 19, but the fine print on the end cap says actual size is 20 7/8 by 20 7/8. So totally useless to me unless I cut it down to fit. A second filter I bought was the correct size that is was advertised as.
I have been using the filters for about three weeks and so far, I am giving them five stars. The dust seems to be much better. I prolonged the replacement of my filters because I did not have any. My measurements are very hard to find in a regular store.
I ordered a custom filter and it was accurate to about 1/16" on all dimensions! That's great! I ordered a MERV 8 but I think I will go with the next grade up next time. I just have to make sure my heater can handle it.
I bought a 4 pack of 10x10 filters, this is the second time and this batch of filters has alot more cardboard over the filter, it seems it make effect airflow there is so much more cardboard over the filter.