21x23_1/4x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Electrical Components Ideal for foliar application

Ideal for foliar application

This OMRI listed product can be used as a foliar spray or as a soil drench

Temperature control range: 40 to 108°F (5 to 24°C)

Using a timer to automate your lighting adds convenience and encourages productive growth with consistent hours of light

the meter will shut down to avoid erroneous readings caused by low battery level

21x23_1/4x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Electrical Components Ideal for foliar applicationNordic Pure Custom MERV 14 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