20x25x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 1 Pack pumps-and-irrigation-supplies Understanding how HID lamps operate

Understanding how HID lamps operate is critical when designing ballasts that will power a grow lamp

Can be used up to the day of harvest (0-day PHI)

Processing Capability: Wet: 250 lbs/hr | Dry: 50 lbs/hr

adjustable hook-and-loop back closure

This carb source is as unique as it is strong

20x25x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 1 Pack pumps-and-irrigation-supplies Understanding how HID lamps operateImportant 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. If you are replacing a 4 3 8 depth 20x25x4 filter