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The ratings shown are based on tests and procedures performed in accordance with AMCA Publication 511 and comply with the requirements of the AMCA Certified Ratings Programs. The AMCA Certified Ratings Seal applies to air performance ratings only. Application data damper Sideplate and Sleeve dimensional data The drawings below illustrate the factory standard sideplate and sleeve mountings for the SMD-302M. The standard "A" dimensions listed in the table provide adequate space for the mounting of actuators and controls. If space constraints are a problem the "A" dimension can be varied between 53/8 in. (136mm) and 12 in. (305mm). 11/2" max. A 5 in. 12 in.** 6 in. 53/8" 5"A Sleeve Length Varies 33/4" Sideplate Sleeve *With the exception of dampers 11 in. (279mm) high or less (12 in. (305mm)high or less if width is greater than 64 in. (1625mm)) with OCI option. ** On dampers 11 in. (279mm) high or less (12 in. (305mm)high or less if width is greater than 64 in. (1625mm)) with OCI option, sideplate is 16 in. (406mm) in. (mm) "A" dimension Sleeve SideplateStandard Maximum All Dampers* 7 3/16 (183) 12 (305) 6 3/16 (157) When height is 11 in. (279) or less with OCI 11 3/16 (284) 12 (305) 10 3/16 (259) S Space envelopes Required for Actuators and Accessories T* Externally mounted actuators always require space outside of the damper sideplate or sleeve. The “S” dimension illustrates the clearance required for various available actuators. On dampers less than 18 in. (457mm) high, actuators may also require clearances above and/or below the sideplate or sleeve. “B” and “T” dimensions are worst case clearance requirements for some dampers less than 18 in. (457mm) high. All damper sizes under 18 in. (457mm) high do not require these worst case clearances. If space availability above or below the damper sleeve is limited, each damper size should be individually evaluated. B* Actuator Type/Model B* T* SWith OCI, RRL, or TOR With OCI, RRL, or TOR 24 Volt AC MS7520A2015/B MS7520A2213/B 6 in. (152mm) 3/8 in. (10mm) 6 in. (152mm) * For dampers 18 in. (457mm) or more in height these dimensions are 0 in. damper Sizing Information Dampers larger than maximum single section size are supplied as a factory assembly of two or more sections of equal size. The following figures show damper sections and assemblies that have been qualified for operation with a single actuator. Larger sizes can be accommodated using multiples of these assemblies. 50 in. 32 in. (813mm) 32 in. (813mm) 64 in. (1626mm) (1270mm) 50 in. (1270mm) Single Section Double Section Transitioned damper dimensions When a fire/smoke damper is being used in conjunction with round or oval ductwork, the SMD-302M can be supplied in a factory sleeve with round or oval transitions on both ends of the sleeve. Dampers should be ordered to the duct dimensions. Drawings below show overall damper size. D* + 2 in. (51mm)+T H* + 2 in. (51mm)+Ts D* + 2 in. (51mm) +T s D* TYPE R 16 in. (406mm) Min. 21/8 in. s (54mm) Specifications Smoke Dampers meeting the following specifications shall be furnished and installed where shown on plans and/or as described in schedules. Dampers shall meet the requirements of NFPA 92A, 92B, 101, and 105 and further shall be tested, rated and labeled in accordance with the latest edition of UL Standard 555S. Smoke dampers shall be of low leakage design qualified to UL 555S Leakage Class II. Each damper/actuator combination shall have a UL555S elevated temperature rating of 250°F (121. C) minimum and shall be rated to operate at maximum design air flow at its installed location. Each damper shall be supplied with an appropriate actuator installed by the damper manufacturer at the time of damper fabrication. Damper actuator shall be (specifier select one of the following) electric type for 24 Volt operation. Damper blades shall be of the double skin airfoil type and TYPE O W* H* W*+ 2 in. (51mm)+Ts 16 in. (406mm) Min. 21/8 in. (54mm) W* H* H* + 2 in. (51mm)+Ts 16 in. (406mm) Min. W* + 2 in. (51mm)+Ts (54mm) 21/8 in. * These dimensions are furnished approximately 1/4 in. (6mm) undersize, except round and oval dimensions which are approximately 1/8 in. (3mm) TYPE C undersize. Ts = (2)(Sleeve Thickness) shall have an equivalent metal thickness of 14 ga. (2mm) Damper frame shall be galvanized steel formed into a structural hat channel shape with reinforced corners. Bearings shall be sintered bronze sleeve type rotating in extruded holes in the damper frame. Blade edge seals shall be silicone rubber designed to inflate and provide a tighter seal against leakage as pressure on either side of the damper increases. Jamb seals shall be stainless steel compression type with silicone rubber backing. Blades shall be completely symmetrical relative to their axle pivot point, presenting identical resistance to airflow in either direction or pressure on either side of the damper. Damper must be rated for mounting vertically (with blades running horizontal) or horizontally ...