21_1/4x21_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Nutrients and Supplements Do not use with other

Do not use with other pesticides

a speed controller with a power plug

The basic components have been selected and formulated to provide gradual nutrient release for the first weeks of plant growth and are OMRI-listed and approved

Also effective against powdery mildew (Erysiphales)

The motor houses dual ball bearings that are rated at 67

21_1/4x21_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Nutrients and Supplements Do not use with otherNordic Pure Custom MERV 13 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