21x23_1/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack commercial-greenhouse-fixtures Add an Xtrasun ballast to

Add an Xtrasun ballast to your indoor garden and reap the rewards without breaking your budget

Dimensions: 26" x 21" x 10

we recommend that you replace your Pure Carbon Pleated air conditioning filter every 30-90 days

Twister T2 Tumbler Pull Pin

Do not combine in undiluted form

21x23_1/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack commercial-greenhouse-fixtures Add an Xtrasun ballast toNordic Pure Custom MERV 12 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