20x25x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 1 Pack pumps-and-irrigation-supplies Can be used up to

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

The Ceramic HPS can take up to 20 minutes to get to full power

This carb source is as unique as it is strong

A perfect supplemental lighting solution for both Gardens and Greenhouses

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

20x25x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 1 Pack pumps-and-irrigation-supplies Can be used up toImportant 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