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DocuSign Envelope ID: E9612703-F25B-492D-9C8C-EC3F9728ECE6 <br /> Duct system shall be supported at all turns and transitions and at not more than 3 feet on center for <br /> ducts up to 18" in maximum dimension and 4 feet on center for larger ducts. <br /> All ducts shall be supported by hangers 1" minimum width of 18 gauge galvanized strap, or rods. <br /> Upper ends of hangers shall be secured to floor or structural member above by a method which will <br /> develop the full strength of band or rod. <br /> 15766 HANGERS AND SUPPORTS: <br /> Horizontal rectangular ducts shall be supported by hangers as follows: <br /> Duct Size-Long Dim. Hanger Size &Type Maximum Spacing <br /> 60" or less 1"x 18 gauge 8'-0" <br /> 61" and over 3/8" dia. rod 8'-0" <br /> Bands shall be bent over one inch from end and turned under the corners of rectangular ducts and <br /> fastened with self-tapping screws at corners and at 6" intervals up the sides. Rod hangers shall be <br /> secured to bottom bracing angles with nuts and lock nuts. Hanger material shall be galvanized steel, <br /> 1" minimum 16 gage. <br /> Upper ends of hangers shall be secured to floor or roof construction above by a method which will <br /> develop the full strength of band or rod. <br /> Duct system shall be supported at all turns and transitions and at not more than 6 feet on center for <br /> ducts up to 24 in. maximum dimension. <br /> All round ducts shall be supported by hangers 1" minimum width of 16 gauge galvanized strap, or <br /> rods. Hangers shall be attached to ducts with self tapping sheet metal screws,pop rivets,or nuts and <br /> lock nuts. Upper ends of hangers shall be secured to floor or structural member above by a method <br /> which will develop the full strength of band or rod. <br /> This contractor shall furnish and install all miscellaneous metal required for the proper hanging of <br /> duct work. <br /> 15768 FIRE DAMPERS <br /> Furnish and install,at locations required or as shown on plans,fire dampers constructed and tested in <br /> accordance with UL Safety Standard 555. Each fire damper shall have a 1-1/2 hours fire protection <br /> rating unless noted otherwise,212 degrees F.fusible link,and shall include a UL label in accordance <br /> with established UL labeling procedures. Damper Manufacturer's literature submitted for approval <br /> prior to installation shall include comprehensive performance data developed from testing in <br /> 15H-28 <br />