12_3/4x20_3/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack nutrients and supplements 000 hours @ 77ºF UL

000 hours @ 77ºF UL Certification Damp

Grow Natural will allow your plants to reach their full potential

it works as an endocrine disruptor

and allows users to adjust and control the light spectrum according to their individual needs

12_3/4x20_3/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack nutrients and supplements 000 hours @ 77ºF ULNordic 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