20x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 10 Air Filters 2 Pack HPS Chemboys Nutrient Line Alpha (3-0-1)

Chemboys Nutrient Line Alpha (3-0-1) Formula is part A of a 2 part A/B nutritional program that helps to start your grow off right by keeping your plants strong and healthy through the grow season

Proactive monitoring indicators to show the PDU’s power

Nordic Pure 20x20x1 MERV 12 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer

4 x Matrix Pad | 9" x 10

It achieves a 38mm charcoal bed thickness and wider mesh openings thanks to a higher microporosity and surface area rating

20x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 10 Air Filters 2 Pack HPS Chemboys Nutrient Line Alpha (3-0-1)Important 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,