16x20x4 (3 5/8) Pleated MERV 15 Air Filters 2 Pack Grow Light Reflectors That's because what is currently

That's because what is currently available on the market is all the same

Use 1 tsp (or scoop) per 2 gallons of water

greenhouse planting and hydroponics etc

The unique combinations of ingredients in SugarDaddy are vital for all stages of plant growth and development

16x20x4 (3 5/8) Pleated MERV 15 Air Filters 2 Pack Grow Light Reflectors That's because what is currentlyImportant 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. If you are replacing a 4 3 8 depth 16x20x4 filter