Arrived onsite today 11/6/2020 to replace the vent damper as proposed. Isolated power to the unit. Removed all existing wires disconnected the venting removed damper and replaced it with the new one. Reconnected all wires powered on the unit. Confirmed operation of the damper and the boiler itself. Boiler was operating correctly and so was the damper. Boiler reached temperature. Damper closed when boiler reached temp. Thank you for choosing CPI Plumbing and Heating Inc.