12_3/4x21x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack veg-and-bloom Increases oxygen and nutrient availability

Increases oxygen and nutrient availability in growing media

Efficacy 93 lm / W

and quiet mixed flow impeller

Only a few organic oils are effective for spider mite control and most spider mite sprays try to employ these natural oils to no meaningful effect

12_3/4x21x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack veg-and-bloom Increases oxygen and nutrient availabilityNordic Pure Custom MERV 8 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