Sealed Modulating Damper Systems – an Ingenious Design from ENERVEX

The Sealed Modulating Damper System (SMDS) from ENERVEX maintains a required pressure (negative or positive) for a common chimney or at individual appliance connector(s). It is essential for today’s condensing boilers since they produce a wide range of draft pressure with turn-down ranging from 5:1 to 20:1. ENERVEX’s SMDS product includes an ingenious design detail that makes it the ideal solution. The issue of condensate build-up in the tubing is inherent in applications designed to work under positive pressure. Other damper systems require the installation of a separate drain, but ENERVEX’s design eliminates the possibility of condensate build-up in the tubing between the pressure sensing stack probe and the pressure transducer. The unique damper design also prevents condensate from pooling above the damper and the possibility of a slug of condensate flushing into the appliance at start-up.

  • The system consists of an ADF Damper with high-pressure and high-temperature sealed bearings. The damper blade is positively sealed with an extremely durable, temperature, pressure and condensate resistant graphite gasket. It protects the boiler connectors from flue gas recirculation when used in a common vent system.
  • The damper is controlled by an EBC24 Draft Controller that interlocks with the heating appliance(s) and controls the pressure using a bi-directional XTP3 Pressure Transducer. The controller can be installed on the damper itself or remotely on a wall or in a boiler control, as it is prepared for DIN rail mounting.
  • The EBC24 Draft Controller is fully programmable on-site – or remotely via Wi-Fi – and has integrated Modbus protocol
  • The system is UL-listed and meets all requirements of NFPA54 (ANSI Z223.1), National Fuel Gas Code, IFGC, International Fuel Gas Code and IMC, the International Mechanical Code and most other relevant codes.

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