12_3/4x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack spl_bfg especially during high-humidity periods or

especially during high-humidity periods or after rain events

With its versatility and durability

• Easy to use liquid supplement

less stretching

The major difference between Big Rootz and Emerald Rootz is switching out pumice stone for perlite - this accomplishes a lighter soil

12_3/4x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack spl_bfg especially during high-humidity periods orNordic 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