Ventilation – Having forced recirculation – Including automatic control means
Patent
1997-07-11
1998-12-08
Joyce, Harold
Ventilation
Having forced recirculation
Including automatic control means
55274, 454232, 454233, 454236, F24F 316
Patent
active
058461280
ABSTRACT:
An air exchange and cleaning system for building enclosures, particularly indoor firing ranges, which removes particulate matter, such as lead and other heavy metals, and gun powder residues and gases from the enclosure atmosphere. An air handler unit includes a particulate matter separator and five stages of filtration which filter both powder and gases from the air. Ducts connect the air handler unit to the enclosed area of the building. The system includes a control system which starts the air handler unit, checks the status of the filters and other operating systems of the air handler unit and ensures that a required minimum negative pressure within the enclosure is achieved before signals are sent to permit operations within the enclosure. In the example of an indoor firing range, the air handler unit and duct system purges the range of possibly contaminated air, checks for satisfactory system operation and ensures a predetermined negative pressure is reached before turning on lighting to the range. When used for a firing range, the air inlet duct system is arranged to create an air wall within the interior of the range and at a position immediately downrange from the shooters' positions. A shooter can project his pistol bearing arm through the air wall while standing on the uprange side. Lead particles, unburned powder and gases are drawn away from the shooters' positions and routed through exhaust ducting to the air handler unit.
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Day Wm. Bruce
Joyce Harold
WMA Ranger, Inc.
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