Material	Galvanized, stainless steel
Features	Controller is in the form of worm gear, which utilizes gear arrangement to operate the damper. Bearing is plain oil lubricated sleeve. Axis is in 3/8”axile. The rim of blade and outer frame of damper are both installed with rubber strips for airtight seal function.  The outer frame is in circular shape for ease of insertion into flexible ductworks, spiral ductworks and metal tubes.

Size	Material thickness
Customization	0.5t-1.2t