I GENERAL

A. All drum louvers shown on the plans or in the outlet schedule shall be Lindab's SPIROcomfort® model DRLA for direct mounting on spiral duct.

B. Drum louver shall be mounted to round duct without the use of a rectangular register tap. Top and bottom flanges shall be adjustable so they meet flush with the round duct wall regardless of duct diameter. End caps shall be provided that conform to the varying duct diameter.

II MATERIALS

A. Drum and mounting flanges shall be manufactured of 20 gauge galvanized steel without further surface treatment. Deflection vanes and extractor blade volume damper shall also be manufactured of 20 gauge galvanized steel. Welds or other surface discolorations on the drum louver are unacceptable.

III CONSTRUCTION

A. Drum louver shall have individually adjustable deflection vanes. Vanes shall be spaced to maximize unit's throw while limiting noise and pressure drop. Vanes shall have steel rivets on both ends to allow for individual blade adjustment without loosening or rattling.

B. Drum shall rotate a minimum of 30° up and down from centerline position. Drum pivot shall incorporate a positioning device to maintain field adjusted drum angles.

C. Mounting flange shall be perforated along its length creating a hinge to facilitate mounting on various diameters.

IV DAMPER

A. Volume damper shall be a single blade extractor type. Multiple dampers shall be utilized on longer units.

B. Volume damper shall be operable from the face of the register and shall utilize a screw mechanism to adjust and maintain damper setting. Volume damper shall withstand force of project duct velocity requirements.

V PERFORMANCE

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

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