21_1/4x23_1/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Garden Hygiene and Safety The 1000W HPS ONLY Hot

The 1000W HPS ONLY Hot Head Magnetic Ballast is great for the grower on a budget

iron phosphate-based bait that lures slugs and snails out of hiding

so it won’t easily come loose from fittings or drains

Made from the finest ingredients

Perfect for a 3' x 3' growing area at 24”

21_1/4x23_1/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Garden Hygiene and Safety The 1000W HPS ONLY HotNordic 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