Manufactured by Airguard and is considered by WaterFurnace to be a suitable replacement MERV 13 air filter.
The replacement filters used with WaterFurnace units that use a 30 x 32 x 2 pre-filter must use a filter that is a full 30" x 32". If you use a smaller filter such as many of the 29 1/2" x 31 3/4" filters sold by other manufacturers, your filter will not seal properly and you could get unfiltered air leaking around the edge of the filter, this is called bypass.
This package ships with 12 filters.