16x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 15 Air Filters 1 Pack timers-and-instruments This unit uses half the

This unit uses half the power

The use of ultra-high frequency DE ballasts should be avoided

• Convenient to use: easy-to-use liquid concentrate

This is easy if you use the Bluelab Truncheon® Nutrient Meter

16x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 15 Air Filters 1 Pack timers-and-instruments This unit uses half theImportant 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,