Barometric Zone Damper - Eliminates the Need for Bypass Damper Installation

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The BZD damper works like any standard zone damper with one exception - it has a built-in static pressure relief mechanism that eliminates the need for a bypass damper. Tests indicate that most systems can handle up to double the rated cfm through the register before noise becomes a problem. Unlike a standard zone damper, the BZD has been designed with both a fixed and a hinged blade and is controlled by an actuator. The lower half of the blade then functions as a barometric pressure relief. The Barometric Zone Damper will allow the barometric half of the closed zone dampers to open if the static pressure reaches it preset setting and bleed a small amount of air into the zones that are not calling, keeping the system static pressure at an acceptable level. Tests also indicate that bleeding a small amount of conditioned air to the zone(s) that are not calling has little impact on the temperature in the zone(s) because in most cases they are above or below setpoint, so the zone(s) can absorb the additional conditioned air. The BZD damper is factory-set and should not need any adjustment. Each thermostatically-controlled zone will require it's own BZD zone damper.