Schebler says its Sequence Draft Control™ (SDC) design service offers boiler and hot water heater manufacturers a complete engineered venting system. SDC is capable of maintaining the desired condensing dew point of combustion, preventing excess draft which impacts efficiency and fuel/air ratio’s – especially with high turndown modulating burners.
This system uses Schebler eVent™ Series dampers at the outlet of each appliance. This modulating damper with pressure transducer maintains the factory recommended firebox positive pressure or negative draft condition at all times. The damper accounts for appliance firing rate – anywhere between high fire and low fire — stack temperature, outside air temperature, and other operational anomalies such as summer/winter operation and appliance proximity to the common stack.