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The standard mounting locations provide enough space for the mounting of actuators, controls and allow space for installation of retaining angles and duct connections. The standard location of a damper mounted in a factory sleeve ("A" dimension) is shown below. The damper can be positioned at other locations within a range of 6 in. (152mm) to 12 in. (305mm) for the "A" dimension. 53/8 in. 5 in.Right hand drive is show n Left hand drive available upon request LH RH A Sleeve Length V aries 6 in. 33/4 11/2 in. max. in. in. (mm) "A" Dimension Standard Maximum All Dampers* 7 3/16 in. (183) 12 (305) When Height is 11 in. (279) or less with OCI 12 (305) 12 (305) *With the exception of dampers 10 in. high (254mm) or less. NOTE: Entire damper frame is not required to be installed within the wall. S T* Actuators and Accessories Space Envelopes Externally mounted actuators always require space outside of the damper 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 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* S With OCI With OCI 120 Volt AC ML4XXX Series Honeywell 5 1/4 in. (133mm) 3/4 in. (19mm) 6 in. (152mm) MS4XXX Series Honeywell 6 in. (152mm) 3/8 in. (10mm) 6 in. (152mm) MS4120 Series Honeywell 6 in. (152mm) 3/8 in. (10mm) 6 in. (152mm) 24 Volt AC ML8XXX Series Honeywell 5 1/4 in. (133mm) 3/4 in. (19mm) 6 in. (152mm) MS8XXX Series Honeywell 6 in. (152mm) 3/8 in. (10mm) 6 in. (152mm) MS8120 Series Honeywell 6 in. (152mm) 3/8 in. (10mm) 6 in. (152mm) Pneumatic (psi) 331-4551 Siemens 1 in. (25mm) 6 1/4 in. (159mm) 6 1/2 in. (165mm) 331-2976 Siemens 2 3/8 in. (60mm) 12 1/8 in. (308mm) 9 1/4 in. (235mm) MK2-7121 Invensys 3 3/4 in. (95mm) 16 1/2 in. (419mm) 10 in. (254mm) * 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 maximum damper section size and assembly configurations for multi-section dampers. 50 in. 32 in. (813mm) 50 in. 32 in. (813mm) 64 in. (1626mm) (1270mm) (1270mm) (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-203 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 s D* TYPE R 16 in. (406mm) Min. 21/8in. s (54mm) W*+ 2 in. (51mm)+Ts D* + 2 in. (51mm)+T H* + 2 in. (51mm)+Ts H* 21/8 in. (54mm) 16 in. (406mm) Min. TYPE O * These dimensions are furnished approximately 1/4 in. (6mm) undersize, except round and oval dimensions which are approximately 1/8 in. (3mm) undersize. W* H* TYPE C H* + 2 in. (51mm)+Ts 16 in. (406mm) Min. W* + 2 in. (51mm)+Ts (54mm) 21/8 in. Ts = (2)(Sleeve Thickness) 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 & 105 and further shall be tested, rated and labeled in accordance with the latest edition of UL Standards 555S. Dampers shall have a low leakage design qualified to UL555S Leakage Class III. Each damper /actuator combination shall have a UL555S elevated temperature rating of 250°F (121°C) minimum and shall be operational 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 120 (24 or 230) Volt operation or pneumatic type for 25 psi minimum (30 psi maximum) operation. Damper blades shall be 16 ga. (1.5mm) galvanized steel 3V type with three longitudinal grooves for reinforcement. 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. 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. The Damper Manufacturer's submittal data ...