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Page 35 of 51 III 08/24/2012 <br /> SOUND RATINGS <br /> CD50 SOUND RATINGS <br /> ��� . �Dampe� ' Damper Full�Open; � Darx�per 7�%-C9pen , �Damper�0°!o Open Darr�Per 25%C�pen <br /> ! �Size '. CFM i NC �FM I { NC� CFM i ; NC ° �FM NC <br /> 2000 17 1500 11 1000 11 500 � <br /> 12 x12 3000 28 2250 22 1500 19 750 * <br /> (305 x 305) 4000 35 3000 29 2000 24 1000 " <br /> 18 x18 2250 17 1688 10 1125 21 563 * <br /> 4500 33 3375 26 2250 32 1125 <br /> (457 x 457) 6750 43 5063 37 3375 40 1688 15 <br /> 24 x 24 4000 11 3000 10 2000 26 1000 ' <br /> (610 x 610) 8000 32 6000 30 4000 38 2000 21 <br /> 12000 43 9000 42 6000 46 3000 31 <br /> NC=Noise criteria in Decibels is based on 10db room effect and 10db of room attenuation. <br /> =Less than 10 NC ' <br /> See ASHRAE Handbook(1977 Fundamentals,Chapter 7)for explanation of NC Ratings. <br /> DIMENSIONAL INFORMATION <br /> 0 <br /> 0 <br /> I s I <br /> I--��z�)�I <br /> g��e�• . LOW PROFILE <br /> (79� 5" � � 5" SWndard construction <br /> �127� (72�) for higher free area on <br /> dampers 72"(305)high <br /> OPPOSED PARALLEL and less. <br /> BLADE BLADE <br /> CD50 SUGGESTED SPECIFICATION <br /> Furnish and install, at locations shown on plans, or in accordance assist in blade to blade seal off.Blades seals shall be mechanically <br /> with schedules,Low leakage dampers shall meet the following min- locked in extruded blade slots, yet shall be easily replaceable in <br /> imum construction standards:Frames shall be 5"x 1"x.125"(min- field.Adhesive or clip-on type blade seals are not acceptable.Bear- <br /> imum thickness) (127 x 25 x 3.2)6063T5 extruded aluminum hat ings shall be non-corrosive molded synthetic.Axles shall be hexag- <br /> channel with hat mounting flanges on both sides of the frame.Each onal(round not acceptable)to provide positive locking connection to <br /> comer shall be reinforced with two die formed internal braces and blades and linkage.Linkage shall be concealed in frame. Submittal <br /> machine staked for maximum rigidity. Blades shall be airfoii type must include leakage,maximum air flow and maximum pressure rat- <br /> ings based on AMCA Publication 500. Damper shall be tested and <br /> extruded aluminum (maximum 6" [152] depth) with integral struc- licensed in accordance with AMCA 511 for Air Performance and Air <br /> tural reinforcing tube running full length of each blade. Leakage. Damper widths from 12"to 60" (305 to 1524)wide shall <br /> not leak any greater than 8 cfm sq.ft.@ 4"w.g. and a maximum of <br /> Blade edge seals shall be extruded double edge design with inflat- 3 CFM sq.ft.@ 1"w.g.Dampers shall be in all respects equivalent <br /> able pocket which enables air pressure from either direction to to Ruskin Model CD50. <br />