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2.06 GRAVITY INTAKE AND RELIEF HOODS <br /> A. General Description: Pressure relief ventilator consisting of housing and accessories. <br /> B. Housing: Heavy-gauge, removable, low silhouette top and outlet baffle; and square, one piece, hinged base. <br /> Welded aluminum construction. <br /> C. Accessories: The following items are required as indicated: <br /> 1. Bird Screens: Removable, %:inch mesh, 16 gauge aluminum or bras§wire. <br /> 2. Relief Dampers: Counterbalanced,parallel-blade,backdraft dampers mounted in curb base. <br /> 3. Roof Curbs: Provide factory prefabricated roof curbs 18"high. <br /> 2.07 VANEAXL41 FANS <br /> A. General Description: Belt-driven or direct-drive as indicated, variable pitch or adjustable pitch as indicated, <br /> vaneaxial fans consisting of fan wheel and housing,straightening vane section,factory-mounted motor,an inlet cone <br /> section,and accessories. (Trane Super Q,or equal) <br /> 1. Variable pitch fans include internally mounted, pneumatic actuator, externally mounted positive positioner, <br /> and mechanical-blade-pitch indicator for variable volume operation. <br /> B. Housings: Steel housing, 14-gage minim,m,with inlet bell and diffuser sections. <br /> 1. Inlet and Outlet Connections: Outer mounting frame and companion flanges;inlet cone shall be welded to the <br /> fan raceway. <br /> 2. Guide Vane Section: Integral guide vanes downstream of the fan wheel designated to straighten the airflow. <br /> C. Wheels: Cast-aluminum, axial-flow type, with airfoil-shaped blades mounted on cast-iron wheel plate keyed to <br /> shaft with solid steel key. <br /> 1. Variable-Pitch Fans: Provide a factory-mounted actuator and blade pitch operating mechanism. <br /> D. Fan Hub and Blade Bearing Assemblies: Cast aluminum,machines and fitted with threaded bearing wells to receive <br /> blade bearing assemblies. <br /> 1. Blades: Replaceable,cast aluminum;factory-mounted and balanced to the hub assembly. . <br /> 2. Fan Shaft: Turned,ground,and polished steel. <br /> 3. Shaft Bearings: Prelubricated and sealed,self-aligning,pillow-block-type ball bearings. <br /> 4. Shaft Bearings: Grease-lubricated, self-aligning, pillow-block type; tapered roller bearings with double- <br /> locking collars and two-piece,cast-iron housing. <br /> E. Direct-Drive Units: Motor encased in housing out of air stream, factory-wired to disconnect located on outside of <br /> fan housing. <br /> F. Belt-Drive Units: Provide enclosure around belts and sheaves. <br /> 1. Motor Mounting: Adjustable base. <br /> 15850-6 No.99132-CP2 <br />