For natural gravity or positive pressure systems, model GRS offers excellent performance and durability for intake or relief applications. Featuring an exceptional low silhouette design and rugged construction this model is both efficient and economical.

• 34 x 34 inch base with prepunched mounting holes for easy attachment to roof curb
• All aluminum exterior for corrosion-resistant construction
• Integral birdscreen to prevent entry of birds and small objects

The CRD-1 is a UL555C classified damper designed to limit the radiant heat transfer through an opening in the ceiling membrane of a fire-resistance rated floor/ceiling assembly of three hours or less

Quick – up to 6 times faster than traditional suspension systems Safe – can be pre-installed to channel using pre-fitted washer/nut or using retention clip reducing time working at height Easy – integral ergonomically designed release button allows for simple adjustment Secure – button acts as a locking screw and indicator clearly highlights the cable is locked in position for ultimate security Versatile – variety of foot attachments available to suit applications Strong – highest load rating capability to date up to 550 lbs with 5:1 SWL NOT suitable for use in chlorinated / swimming pool environments UniGrip - Standard is designed for non-mechanical fixing through brackets. It's supplied with retention clip for pre-fabrication applications and features central cable exit.