Patent ID: 8647405

Claim:
A filter housing releasably receiving a filter, the filter housing comprising: (a) a duct having a longitudinal axis, an inlet and an outlet spaced from the inlet along the longitudinal axis, the duct having a cross section extending along the longitudinal axis, the duct including a first access port transverse to the longitudinal axis; (b) a first registration flange extending into the cross section at a first position along the longitudinal axis; (c) a second registration flange extending into the cross section at a different second position along the longitudinal axis, the first access port being longitudinally intermediate the first registration flange and the second registration flange; and (d) a first removable seating rail assembly sized to pass through the first access port and releasably engage an inside surface of the duct longitudinally intermediate the first registration flange and the second registration flange, the first seating rail assembly being separate from the filter and including a seating flange extending into the cross section.