20x25x5 (4 3/8) Lennox X6673_X6675 Replacement  MERV 8 Pleated Plus Carbon 1 Pack Emitters PPF - 1176 μmol/s

PPF - 1176 μmol/s

Anyway you use it

the other for Calibration

This is because there is a small amount of nitrogen in Buddha Bloom

Item # Description ANSI Initial Lumens CCT Bulb Shape CS/QTY PX-LU220/MH Plantmax – 220 Watt High Pressure Sodium Conversion Lamp M58 25

20x25x5 (4 3/8) Lennox X6673_X6675 Replacement  MERV 8 Pleated Plus Carbon 1 Pack Emitters PPF - 1176 μmol/sImportant 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,