Patent ID: 6514138
Filing Date: 2003-02-04
Classification: F24F

Abstract:
An apparatus for ventilating inside space of a structure comprising:a demand ventilation module for use with a heating, ventilation, and air conditioning (HVAC) system comprising: a housing adaptable to be coupled to a return portion of the HVAC system, the housing defining an inner chamber and comprising an air outlet and at least one outside air inlet; an integrated damper located in the inner chamber for regulating outside air infiltration into the HVAC system and into the inside space by way of an air pressure differential between return air and the outside air in direct proportion to actual real-time air condition demand; at least one restrictor plate in conjunction with the air outlet protruding into the inner chamber, the at least one air restrictor plate defining an air-restricting opening along a first stage of a damper stroke range, the air-restricting opening controlling outside air flow and requiring the damper to move further to allow the same volume of air to enter the HVAC system than would otherwise be necessary, thereby resulting in more accurate control of the damper under low air velocity conditions; and a damper seal along an outside perimeter of the damper that seals against the inner chamber and the at least one restrictor plate, thereby improving controllability of air flow through the first stage and a second stage of the damper stroke range.