Max cfm: 42/71m³h @ 0.1 sec contact time Prefilter: Optional Mounting: Bayonet Flange: Optional, 4"/5" Dimensions: (with pre-filter) ·Outside Diameter: 140mm/5.5" ·Height: 453mm/18" ·Carbon Weight: 2.1kg/4.63lbs Pressure drop at max cfm: 40pa/ .20wg