20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 12 Pleated Plus Carbon 2 Pack Water Pumps & Irrigation Supplies 1 - (1L) of Blast

1 - (1L) of Blast Off

Insert support if necessary

which causes the perlite to pop in a manner similar to that of popcorn

If you’re looking for a quality HPS system at a very affordable price

reliability & exceptional consistent results

20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 12 Pleated Plus Carbon 2 Pack Water Pumps & Irrigation Supplies 1 - (1L) of BlastImportant Note: Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air conditioner filter. It's best if you measure your air filter for the EXACT size and compare it to our "Actual Size" and then you can be sure your A C air filter fits! With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer. We also carry 4 7 8 and 5 1 4 inch depth filters,