21_1/2x23_5/16x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack Lighting Replacement Tumbler Barrel Bubble Magic

Replacement Tumbler Barrel Bubble Magic 1500 gram - 145 micron

Decrease during flowering to keep nitrogen levels accurate

• Simply apply Mosquito Dunks to any standing water

The purchase of a full sized greenhouse is undoubtedly a very large financial investment

21_1/2x23_5/16x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack Lighting Replacement Tumbler Barrel Bubble MagicNordic 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