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North American Damper Companies. Bull; About Dampers. Bull; Damper Companies. Bull; Contact Us. Bull; Useful Links. Advance Valve Design, Inc. (AVD). American Warming and Ventilating (AWV). Damper Design, Inc. (DDI). Design Fab, Inc. Clyde Bergemann Bachmann (CBBA). Fox Equipment, LLC. Kelair Products, Inc. Annual Sales in Damper Products in Millions ( $ - Less then a Million, 2$ - Over Two Million, Etc.). Canadian Based or Major Canadian Office. Advance Valve Design, Inc. (AVD). Advance Valve Design, Inc.