18x27x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack pest control By tightly and smoothly controlling

By tightly and smoothly controlling environmental conditions

THE GRAND DADDY PAD absorbs the humidity in your indoor garden

Leveling Feet

A bonus feature is for picking up bottles or litter

BioWorks Mycotrol ESO offers the same superior quality as its counterpart

18x27x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack pest control By tightly and smoothly controllingNordic 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