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a non-relieving version is generally preferred to prevent fluid discharge through the atmospheric vent
For contractors maintaining oil-fired systems
making it a staple for contractors looking for long-term reliability in custom ductwork
Common Questions Which boiler models use the Viessmann 7871315 control
Featuring a balanced valve design
Lennox 16W72 Twinning Kit 318423-701 a non-relieving version is generallyThe Lennox 16W72 Twinning Kit (ATWIN580) is an essential field installed accessory designed to synchronize the operation of two gas fired furnaces within a shared duct system. Engineered for constant torque blower motors, this OEM Lennox furnace part ensures that both units respond simultaneously to a single thermostat call, maintaining balanced static pressure and airflow. This kit is a requirement for twinning Lennox furnaces to prevent air bypass
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