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Ships within 48 hours · Estimated delivery Sep 16 - Sep 21
Active Aqua air stones are an ideal way to add oxygen to your hydroponic growing system
The round duct tailpiece is compatible with 6” inline exhaust fans
No more guessing involved
Specially designed articulating four-bar compound linkage
– 5 wheels around perimeter
16_1/2x21x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack food-&-water-storage Active Aqua air stones areNordic Pure Custom MERV 10 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
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