Patent ID: 7390340
Filing Date: 2008-06-24
Classification: B01D

Abstract:
1. A filtration apparatus for use in combination with a soil vent stack to be cleaned which comprises: at least one housing having an inner chamber; an inlet and an outlet; HEPA filter in said at least one chamber; an outlet portion for said apparatus for discharge of a gas or vapor from said filter means and chamber associated with said at least one housing; an inlet portion of said apparatus associated with an inlet of said at least one housing for receiving said gas or vapor to be passed through said chamber and filter means; first valve means associated with the inlet portion of said at least one housing to selectively close off the inlet to said at least one housing and to control the flow of said gas or vapor; second valve means associated with the outlet portion of said at least one housing to selectively close off the outlet of said at least one housing and to control the flow of said gas or vapor.