Patent ID: 7294181
Filing Date: 2007-11-13
Classification: B60H

Abstract:
1. A self-contained, portable positive pressurization/filtering device comprising: an enclosed housing having an air inlet and an air outlet; a high efficiency particulate air (HEPA) filter within the housing adapted to capture substantially all particles in dirty air; an intake conduit coupled to said air inlet adapted to accept dirty air from an exterior environment and direct the dirty air to the air inlet of the housing; an exhaust port communicating with the air outlet adapted to exhaust substantially particulate-free clean air into an interior enclosed environment; a fan within said housing adapted to draw in the dirty air from the exterior environment, through the intake conduit and then through the HEPA filter, and exhaust the substantially particulate-free clean air to the interior enclosed environment at a rate sufficient to create a positive pressurization level with respect to an air pressure level of the dirty air in the exterior environment; and a pressure gauge for monitoring atmospheric pressure in the exterior environment and for monitoring air pressure in the enclosed environment, and where said pressure gauge operates the fan at a rate to maintain a positive air pressure in the enclosed environment relative to atmospheric pressure.