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Duct Size <br />tl <br />Ml# <br />Angle Size <br />36" X 18" <br />48" X 24" <br />60" X 30" <br />1-1/2" X 1-1/2" X 1/8 <br />2" X 2" X 1/3" <br />2" X 2" X 3/16" <br />D. Turning Vanes <br />1.Standard Vanes. Where space conditions prevent the long <br />sweep elbows specified in this section and/or where <br />square turns are indicated on the drawings, the Contrac­ <br />tor has the option of using commercial turning vanes <br />or he may construct the vanes to conform with the follow­ <br />ing requirements. Vanes shall be well braced and rough <br />or raw edges shall be avoided to prevent objectionable <br />noise, they shall be the double thickness type and shall <br />be the same gauge as the duct in which they are installed. <br />Vanes shall be preassembled on runners before being in­ <br />stalled in the elbow. Vanes shall conform to the follow­ <br />ing table: <br />Duct <br />Width <br />Inches <br />Vane <br />Spacing <br />Inches <br />Inside <br />Blade Radius <br />Inches <br />Outside Runner <br />Blade Radius Width <br />Inches Inches <br />Up to 25" <br />Above 25" <br />1-1/2" centers <br />3-1/4" centers <br />2 <br />1-1/2 <br />1 <br />2-1/4 <br />5 <br />9 <br />2. Acoustical Vanes - provide where indicated. <br />E.Inspection Plates and Test Holes: Provide where indicated <br />in ductwork or casings for all balance measurements. Test <br />holes shall be factory fabricated, airtight and noncorrosive <br />with screw cap and gasket. Extend cap through insulation. <br />t?w •Flashings; Provide waterproof flashings where ducts pass <br />through exterior walls and roofs. <br />G.Cleaning of Ducts; Remove all debris and dirt from ducts <br />and wire clean. Before installing air outlets, use air <br />handler to blow dry air through entire system at maximum <br />attainable velocity. Provide temporary air filters for this <br />operation. <br />H.Air Filters: Install with sealant and gaskets to prevent <br />bypassing of air. <br />I.Eliminators: Each cooling coil in field-fabricated casings <br />having an air velocity of over 400 feet per minute through <br />the net face area shall be equipped with moisture eliminators, <br />a responsible company official, that no moisture will be <br />carried beyond the drip pans under actual conditions of <br />operation. <br />J.Drain or Drip Pans, Drain Connections and Drain Lines: <br />Provide coils and eliminators with drain and drain connec­ <br />tions. Where coils are sectionalized, with one section above <br />the other, install intermediate drain pans. There shall <br />be no entrainment of water in air stream. Drain condensate <br />from drain pans to the nearest floor drains. Equip drain <br />15840-9