Barometric dampers shall be equipped with thermal safety (spill) switches. Barometric dampers are typically used with Category I or II appliances and other non-condensing appliances where the chimney is designed to operate naturally. before the excessive natural draft acts upon the appliance. Typically placed perpendicular to flow in each appliance’s connector, a barometric damper can offload up to 0.3″W.C. The use of a modulating damper can reduce fuel consumption by 10% or more when installed in individual appliance connectors.Ī barometric damper is a device designed to offload natural draft by introducing dilution air into the chimney or gas vent. To control the negative pressure generated by a tall stack or an induced draft fan, stack outlet dampers were installed and controlled to maintain a setpoint typically about 0.1 negative pressure measured at the. The multi-blade damper-actuator may be used with any type of chimney or gas vent, including special gas vents, and may be placed in the common manifold or in individual appliance connectors to comply with the NYC’s Department of Environmental Protection. Boilers made in this era typically had tall stacks to induce a negative pressure (or draft) in the boiler, or induced draft fans. A modulating damper system is specified to manage and maintain a constant draft for single or multiple boilers, water heaters, and other Category I, II, III or IV heating appliances. ![]() modulating dampers, consist of a controller, pressure transducer, high speed actuator and multi-blade damper. Burnham 103661-02 Induced Draft Boiler Control used on Boilers ESCB, PVGA. ![]() There are two types of draft control:įor your specific project, please contact our design team to discuss. Even though modern forced draft boilers are usually airtight, they still often need draft controls to help stabilize burners using flue gas recirculation for NOx control. Draft control is recommended when chimneys or gas vents generate natural draft in excess of the appliance manufacturer’s draft requirements. Draft controls have long been an important component in boiler systems to help control negative pressure.
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