Frame: High quality galvanized Iron Sheet of 1.6mm thickness.
Blades: Interlocking type blades roll formed from 1mm thick galvanized steel.
Blade Ramp: Formed from 1.6mm thick galvanized steel with a spring holder.
Springs: 2nos. constant force stainless steel springs.
Fusible Links: UL listed fusible links which has fire rating of 165° F / 212° F.
The frame is made from 1.6mm thk. high quality galvanized iron sheet. All welded joints are rust proofed by zinc paint coating. The blades are roll formed from 1mm thk. galvanized steel. The interlocking type blades are designed with hat shaped reinforcement ridges ensuring strength and stability. The blade ramp is formed from 1.6mm thk. galvanized steel with a spring holder. The ramp is frmly secured to the frame by rivets. Constant force stainless steel springs are firmly secured to the blades and held in place on the ramp. The blades are secured by UL listed fusible links which has a fire rating of 165°F / 212°F and thus kept out of the airstream when not in operation.
The heat responsive links on detection of heat beyond 165°F / 212°F release the blades from their position. Upon release, the blades which are connected to the springs are pulled down by the springs and get automatically locked on a latch and remains so until reset. These fire dampers are 1 rated upto 1/2 hours rating with low leakage. All dampers are manufactured in compliance to the UL 555 standards and the company's quality control procedures.
Upon the termination of fire condition, the damper can be re-opened (usually an access door has to be provided for inspection) by simply pulling up the curtain blades and replacing the fusible link.
Vertical: UL Listed 165°F / 212°F fusible link as standard.
Horizontal: UL Listed 165°F fusible link as standard