23_1/4x29_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Hydro Systems Fits in the top duct

Fits in the top duct of the Carbon Air Unit

and calcium

The potassium bicarbonate in MilStop kills mildew spores on contact by pulling water from spores and altering the pH on the leaf surface

The Adjust-A-Wings Hellion DE has been meticulously crafted to produce the coolest and most even light distribution ever emitted from a DE reflector

Protection and style are combined in this affordable pair of Grow Room Glasses

23_1/4x29_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Hydro Systems Fits in the top ductNordic Pure Custom MERV 7 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