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Ships within 48 hours · Estimated delivery Aug 19 - Aug 24
Both high and low level limits are user-adjustable to meet local regulations for supplemental CO2 use indoors
Long Filter Life – Designed for extended use across full growing seasons before replacement is needed
Use the spout on the opposite side for a second round of pouring as needed
• Lower life time cost
Also makes an excellent “All Purpose” plant food
16x20x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 8 Pleated Plus Carbon 2 Pack Lighting & Electrical Components Both high and low levelImportant Note: Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air conditioner filter. It's best if you measure your air filter for the EXACT size and compare it to our "Actual Size" and then you can be sure your A C air filter fits! With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer. We also carry 4 7 8 and 5 1 4 inch depth filters,
