20x25x5 (4 3/8) Lennox X6673_X6675 Replacement  MERV 12 Pleated Plus Carbon 1 Pack nutrients-and-supplements This increase in availability of

This increase in availability of electrons promotes efficient absorption and uptake of nutrients

Real-time data

The HI7634-00 is a two-pole amperometric EC/TDS probe for panel mounted mini controllers that measure in the low range (μS/cm and ppm)

improve root systems

- Adjustable separate set points for day and night

20x25x5 (4 3/8) Lennox X6673_X6675 Replacement  MERV 12 Pleated Plus Carbon 1 Pack nutrients-and-supplements This increase in availability ofImportant 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,