21_1/4x23_1/4x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Monterey Lawn & Garden Products The pre-drilled holes can be

The pre-drilled holes can be used for the grommets and barbed fittings necessary to outfit the drum with tubing for filling and draining

When used with a temperature controller and tray domes

Material Handling Polyurethane Coated

This reflector is made of Miro® aluminum which provides optimal reflectance to your crop

21_1/4x23_1/4x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Monterey Lawn & Garden Products The pre-drilled holes can beNordic Pure Custom MERV 10 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