16x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filters 2 Pack X Nutrients Grow Spray 1 Gal Allow flowers to dry until

Allow flowers to dry until outer leaves easily flake off when gently rubbed

Stability Indicator - An hourglass indicator is displayed on the LCD until a stable reading is obtained

Injection capabilities of 1:100 to 1:20

1000 pack of small reusable

Recommended for use with: Phresh & Black Ops Carbon Filters

16x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filters 2 Pack X Nutrients Grow Spray 1 Gal Allow flowers to dry untilImportant 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