Patent ID: 8523970

Claim:
An air filter, the air filter having a shell, the shell comprising a perforated, tubular wall, a first end wall at one end of the tubular wall closing the one end, a second end wall at the other end of the tubular wall having an opening; a tubular Hepa filter removably mounted within the shell adjacent the perforated wall; a blower unit outside the shell having first and second ends, a through duct passing through the unit past the first and second ends of the unit, the duct having an inlet opening at one end and an outlet opening at its other end, a fan in the duct, and a motor for rotating the fan; connecting means for mounting the first end of the blower unit on the second end wall of the shell with the duct passing through the opening in the second end wall to have the inlet opening inside the filter whereby rotation of the fan moves air from outside the air filter through the air filter between the perforated wall and the duct, the air passing through the filter to the duct.