21_1/4x23_1/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Grow System/ Trays/ Reservoirs Hydrofarm's new Phantom CMh System

Hydrofarm's new Phantom CMh System combines our Phantom CMh reflector with the multi-voltage Phantom ceramic halide-specific digital ballast and the Philips double-jacketed Master Color 942 CDM Elite MW 315W T12 ceramic metal halide lamp

durability

Features and Benefits: Deep guard design for unmatched performance

Rootshield Plus is also available in a wettable powder formulation

21_1/4x23_1/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Grow System/ Trays/ Reservoirs Hydrofarm's new Phantom CMh SystemNordic Pure Custom MERV 12 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition