Systemicons Schornsteinzubehör
Jeremias® Exhaust Systems
    2. Commercial Exhaust Systems
    3. Exhaust system accessories
    4. Flue gas dampers

    flue gas dampers

    HELPS SAVE ENERGY AND PREVENTS THE INFLOW OF EXHAUST GASES

    Flue gas flaps are installed in the connecting line between the boiler and chimney and close the flue gas path to the chimney when it is no longer needed.

    This prevents the heat generator and the installation room from cooling down and contributes significantly to energy savings. In addition, for example in cascade systems, they also prevent a possible flow of exhaust gases from other fireplaces connected to the chimney into the installation room and provide a certain level of sound insulation in multi-occupied chimneys.

    We offer you both manually lockable flue gas flaps and flue gas flaps with electric servomotors that are automatically controlled by the burner.

    A special case are implosion flaps (Joukowski flaps) or explosion flaps (pressure relief flaps), which compensate for unwanted pressure fluctuations in the exhaust pipe.

    Barometric exhaust dampers

    Type M
    Oil or Coal - Residential

    The M control lends itself ideally to conditions requiring a great deal of stability and accuracy. Designed for settings from .01” to .1”, the Field M Control is recommended for oil or coal-fired residential heating applications. The Type M features an infinitely variable screw adjustment, permitting an extremely fine instrument setting. The M employs side wings to control air direction with gate curvatures designed to compensate for differences in horizontal and vertical settings.

    TemperatureMax. 392°F
    Pressure0,85" WC
    ClassificationsANSI Z21.66-205, CSA6.14-2015, Class-C330503; Class-C330583

    Type MG-1
    Gas

    A double-acting control for gas-fired furnaces and boilers is widely used for conversion burner installations, gas draft-induced appliance operation with mechanical draft inducers, or sidewall power venters. lt is also recommended for use on gas atmospheric appliances where a draft hood cannot be installed, and can improve combustion stability and draft on many gas atmospheric installations with venting problems.

    The MG-1 provides precise, accurate control of drafts at levels higher than permitted by a standard draft diverter, which is a frequent requirement with gas. Because it is double-acting, it opens out to relieve positive vent system pressures as low as .01". Draft adjustments using weights are simple and accurate from .01” to .1”.

    Type MG-2

    Solid, Oil or Gas Commercial/Industrial

    This is a series of compact, rugged, heavy-duty controls for use on large residential, commercial, and industrial applications. The Field Type M+MG2 Draft Control provides precise draft regulations for solid fuels, oil, gas, or oil/gas appliances requiring only the simplest, on-the­ job adjustments depending on which fuel is to be utilized. In a gas installation, the double-acting Type M+MG2 is specified instead of a draft hood to give the appliance the assistance of the chimney. In a duel fuel oil/gas or a gas-fired only application, use the M+MG2 as a double-acting draft control with the optional Field Thermal Switch accessory.

    Use the M+MG2 as a single-acting draft control for oil or solid fuel applications. For any installation with 10" or larger diameter smoke pipe, specify our standard M+MG2 Draft Control, the unit that can be adapted to any fuel. The moving part (gate) rests on a long, thin, stainless steel knife edge which, in turn, is supported by self­aligning and self-cleaning bearings. When the heavy gauge gate moves, only the knife edge rests on the bearing for minimum friction and maximum sensitivity to draft changes.

    Temperature class

    752° F    

    Pressure class

    H1 20" WC

    Condensate durability

    W dry/wet operation mode

    Motorized Exhaust Dampers

    A motor-controlled flue gas damper is suitable for installation in the exhaust systems for all standard appliances which are fired with oil or natural gas. During standstill periods of the appliance, the damper (flap) automatically closes the exhaust path preventing loss of heat. When the temperature controller needs heat, the electric motor automatically opens the shut-off flap before the burner starts and the program of the burner control unit is enabled.

    MED-GA

    • Overload protected motor
    • Automatic stop
    • Pressure applications with wet exhaust conditions (Category IV Appliances)

    MED-HP

    • Heavy duty design
    • For gas and oil heating appliances in wet or dry operation mod
    • For gas fireplaces and solid fuels

    Implosion Relief Valves

    Especially, in large-scale plants, a Joukowski shock can occur in the exhaust gas line due to strong pressure fluctuations, triggered for example by a deflagration followed by a pressure reduction, an abrupt switching off of the burner as a result of a power failure/defect or a too fast closing of the air supply flaps of the burner.

    In such cases, the hot exhaust stream is suddenly interrupted, which generates enormously high vacuum in the exhaust gas pipe leading to its deformation at times also irreparable damage. The use of a Joukowski valve prevents this effect/shock.

    In the case of a large pressure change in the exhaust gas line, the normally closed cover plate of the Joukowski flap opens immediately automatically via a spring mechanism, thus allowing air to flow in for pressure compensation. As soon as normal pressure conditions prevail, the flap closes again and the system can resume normal operation. 

    Implosion Relief Valves

    IPR:

    Relief of negative pressure operation in order to assure no flue gases can escape during standard operation.
    For use in engine exhaust, heating appliances, and other fuel fired equipment.

    During normal operation the spring keeps the cover plate closed, if the combustion air damper is closed at the burner due to a blackout, the chimney cannot draw in air through the boiler. The "missing" air now returns through the implosion damper. This prevents the so-called Joukowsky shock by immediately opening the cover plate. Example, if the flue gases are cut off from the chimney during a sudden appliance shutdown, the negative pressure in the chimney may contract (warp) the connecting breeching.

    Connection: Flange or factory welded onto a fitting. May be installed vertically or horizontally.

    Pressure Relief Valves

    When combustion engines or special gas engines are operating, it is possible that the incompletely combusted fuel mixture gets into the exhaust gas line.

    Possible causes: Not tight closing exhaust valves, an incorrect air / fuel ratio, insufficient fuel supply, an incorrect ignition timing or a too rich fuel mixture.

    If the unburned fuel mixture ignites because of  the glowing hot catalyst, then this would lead to an explosion in the exhaust system. Therefore, the installation of a pressure relief valve (explosion damper) is recommended, especially for large systems. The PRV allows the explosion pressure resulting from the explosion to escape automatically from the system in seconds, thus preventing damage to the exhaust gas line.

    Jeremias pressure relief dampers are made of high-quality 316L stainless steel and can be used up to an exhaust gas temperature of 1112 °F (600 °C). Thanks to the variably adjustable opening pressure, the PRV can be adjusted according to the requirement of respective system.

    PRVF

    FLAME RETARDANT PRESSURE RELIEFE VALVE

    PRVF:

    Relief and monitoring of excessive pressure (backfire or delayed ignition of unburnt fuel) in engine exhaust, heating appliances, and other fuel fired equipment.
    The spring loaded plate keeps seal tight until pressure forces plate open. A built-in switch alerts maintenance or plant personnel that a
    backfire has occurred.

    Connection System: 125/150 Lb. flange pattern.

    A special material in packed area retards flames from protruding outwards.

    PRESSURE RELIEFE VALVE

    PRV:

    Relief and monitoring of excessive pressure (backfire or delayed ignition of unburnt fuel) in engine exhaust, heating appliances, and other fuel fired equipment.

    The spring loaded plate keeps seal tight until pressure forces plate open.

    Connection System: 125/150 Lb. flange pattern.

    PRESSURE RELIEFE VALVE WITH ROLLED FLANGE

    PRVR:

    Relief and monitoring of excessive pressure (backfire or delayed ignition of unburnt fuel) in engine exhaust, heating appliances, and other fuel fired equipment.
    The spring loaded plate keeps seal tight until pressure forces plate open.

    Connection System: 1/2" rolled flange.

    Condensing boiler exhaust damper

    VBD Damper

    Modulating and On/Off Vent Damper System

    The VBD Vent Damper System consists of a single blade damper. It can be used as an on/off damper to prevent airflow though the appliance in an off cycle as well as to maintain a constant negative or positive pressure in the vent exhaust connector.

     

    Main features

    • All-stainless steel construction.
    • Heavy duty design.
    • Disc is metallic tight to outer casing.
    • Overload protected motor.
    • Automatic stop.

    Construction:

    • 20 Gauge 316L stainless steel housing and blade
    • ½” graphite sealed bearings
    • Viton seal on damper blade

     

      Applications

      • Motor actuated on/off and modulating gas vent damper for gas vents serving gas or liquid burning appliances such as Category I, II, III & IV appliances or Building Heating Appliances.
      • Essential for common venting Condensing or Category II/IV Appliances – will not allow any possibility of flue gas recirculation and to maintain constant exhaust pressure for each appliance at all times.
      • Reduction of cycle venting losses through boilers and draft hoods.

      Connection / Installation Details:

      • ½” flanged connections
      • Positioning: horizontally or vertically – shaft must remain horizontal