Large Pro Activated Carbon Filter. 4 inch flange and pre-filter included. Recommended for 4 inch fans (150 cfm max).
Manufactured with only the finest high porosity activated carbon, the PROfilters 45s effectively remove 99.5% of volatile organic compounds.
The factory installed high capacity pre-filter eliminates bigger particles such as dust to prevent premature usage of the carbon. Rated for a continuous worry-free operation, light weight and its compact dimensions, make the PROfilters 45s ideal for residential filtration.