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Mimics spring time light
• Daylight readable blue LEDs
Separate intake and exhaust ports for superior efficiency
Essential oils are harmful to sea life and may cause long term adverse effects to the aquatic environment
20x20x4 (3 5/8) Pleated MERV 13 Air Filters 1 Pack Emitters Mimics spring time lightImportant 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 20x20x4 filter