Transitioned Damper Dimensions

When a fire/smoke damper is being used in conjunction with round or oval ductwork, the SMD-401M 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. (
D*+ 2 in. (	51mm) +T	s			W*+	2 in. (51mm)+T
						2 in. (51mm)+T
						s
			W*+ 2	in. (51mm)+T		s
				s

D* + 2 in. (51mm)+T	s	H*+ 2 in. (51mm)+T	s
		H*+ 2 in. (51mm)+T	s
		21/8 in.
		(54mm)
		(54mm)

16 in. (406mm)	D*	16 in. (406mm)
Min.		Min.

TYPE R

	H* + 2 in. (51mm)+T	s
	H*	s
21/8 in.	H*
21/8 in.
(54mm)

16 in. (406mm) Min.

TYPE O

21/8 in. H*

(54mm)

TYPE C

*These dimensions are furnished approximately 1/4 in. (6mm) undersize, except round and oval dimensions which are approximately 1/8 in. (3mm) undersize.

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 90A, 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 I.

Each damper /actuator combination shall have a UL555S elevated temperature rating of 250°F (121ºC) minimum and shall be rated to operate at maximum design airflow 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 hollow extruded aluminum airfoil type with structural reinforcing tube running full length of each blade. 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. Damper must be rated for mounting vertically (with blades running horizontal) or horizontally and be UL 555S rated for leakage and airflow in either direction through the damper.

The basis of design is Greenheck Model SMD-401M.

SMD-401M Rev. 5 April 2007

SMD-401M specifications

The Greenheck Fan SMD-401M is a highly efficient and versatile air movement solution designed for a variety of commercial and industrial applications. As part of Greenheck's extensive lineup of fans, the SMD-401M combines advanced engineering with innovative technology to meet the demanding needs of HVAC systems.

One of the significant features of the SMD-401M is its energy efficiency. The fan incorporates a high-performance motor that is designed to reduce energy consumption while delivering optimal airflow. This makes it an excellent choice for facilities looking to lower operational costs and reduce their carbon footprint. Additionally, the fan is equipped with a direct-drive design, which enhances reliability by eliminating the need for belts and pulleys, reducing wear and maintenance for the user.

The SMD-401M also includes a durable construction using high-quality materials that ensure longevity and resistance to the elements. The casing is designed to withstand harsh environmental conditions, which makes this fan suitable for outdoor installation. The fan is also lightweight, allowing for easier handling and installation, further adding to its versatility.

Another defining characteristic of the SMD-401M is its quiet operation. The fan is engineered to minimize noise emissions, which is crucial for maintaining a comfortable environment in commercial spaces like offices, schools, or retail establishments. This acoustic performance does not come at the expense of airflow, as the SMD-401M is capable of delivering substantial volumes of air effectively.

Technologically, the SMD-401M features advanced controls that allow for precise adjustments to airflow rates and operational settings. This adaptability enables users to tailor the fan’s performance to specific requirements, enhancing overall system efficiency. Integration with building management systems is also supported, allowing for seamless connectivity and monitoring.

In summary, the Greenheck Fan SMD-401M stands out for its energy efficiency, low noise operation, durable design, and advanced control features. Its ability to perform in diverse environments while delivering reliable service makes it an exceptional choice for engineers, contractors, and facility managers alike. Whether used in ventilation systems or exhaust applications, the SMD-401M exemplifies Greenheck's commitment to quality, performance, and sustainability in air movement solutions.