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If there are already beneficial insects in your growing area but pest populations are low
With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer
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minimal pH drift is assured
the stability of your grow environment
20x24x1 Furnace Air Filters MERV 8 Pleated Plus Carbon 24 Pack commercial-greenhouse-fixtures If there are already beneficialNordic Pure 20x24x1 MERV 8 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer. This results in less flow restriction and 33% more surface area for cleaner smelling air. It will help eliminate unwanted odors as well as trap most airborne dust and particulate matter for fresh, clean air. Odorous gases and vapors (VOC) are attracted to and held by the activated carbon material
