Product 456/745
Honeywell's Modulating Automatic Round Damper (MARD) series is a round damper with a 24 Vac floating control type modulating motor for bypass and zone damper control. It is constructed of 22 ga. galvanized steel, and has male (crimped) and female (uncrimped) ends to connect to any rigid or flexible round duct. The motor timing is 90 seconds open to close.
The MARD is used for bypass control when connected to the static pressure control (SPC).