I GENERAL

A. Supply or exhaust registers shall be Lindab's SPIROcomfort® model RGS-3 for direct mounting on spiral ducts of sizes shown on the plans or outlet schedule.

B. The register is to be mounted without the use of a rectangular register tap. The top and bottom flanges are to meet flush with the spiral duct wall regardless of duct diameter. End caps shall be provided that conform to the varying duct diameter.

II MATERIALS

A. The register shall be manufactured of 20 or 22 gauge galvanized steel without further surface treatment. Welds or other surface discolorations on the register are unacceptable.

III CONSTRUCTION

A. The register shall have double deflection adjustable blades with the front blades parallel to the short dimension of the register. Blades shall be placed on ¾" centers and shall have steel friction pivots on both ends to allow for individual blade adjustment without loosening or rattling.

B. Screw holes shall be countersunk for a flush, neat appearance.

IV DAMPER

A. The volume damper shall be of the single blade type manufactured from 20 gauge electro-galvanized steel.

B. Volume damper shall be operable from the face of the register via a volume control rod. Notched rod shall be fixed in place by a tension lock located at the front of the register.

V PERFORMANCE

A. Performance of register shall be as per manufacturer's catalogued data. Manufacturers whose registers utilize a rectangular register tap to adapt to use with spiral duct shall submit correction factors for their catalogued data.

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