Comments about Honeywell Honeywell 14" Round Automatic Damper ARD14:
The damper is very well constructed and motor has adjustable stops. Heavy gauge metal insures damper will maintain round shape so damper flap will operate properly. Damper flap has gasket material to help stop air flow when the damper is closed.
Installing flexible ducting onto the damper body can be tricky as there is a spiral seam and no transition area to help hold the tie wraps in place.
To ensure ducting stays in place, I used two sets of tie wraps locked on tightly.