16x20x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 15 Plus Carbon 2 Pack Extension so please consider these dosages

so please consider these dosages as guidelines

3 in | Total Airflow: 52 CFM | Total Noise: 18 dBA | Bearings: Dual Ball

it takes about 10 seconds

Use Elite 91 SILICIC ACID with every feeding from the seedlings/cuttings growth stage up until the 7th or 8th week of the crops fruiting/flowering cycle

16x20x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 15 Plus Carbon 2 Pack Extension so please consider these dosagesImportant 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,