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.

Double Section

Single Section

48 in.

(1219mm)

36 in.

(914mm)

32 in. (813mm)

30 in. (762mm)60 in. (1524mm)

Transitioned Damper Dimensions

D*+ 2 in. (

 

 

51mm) +T

s

 

 

 

When a fire/smoke damper is being used in conjunction with round or oval ductwork, the FSD-331 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.

 

 

 

W*+

2 in. (51mm)+T

 

 

 

 

 

s

W*+ 2

in. (51mm)+T

s

 

 

 

 

 

 

 

 

 

 

 

 

 

D* + 2 in. (51mm)+T

 

 

 

 

 

 

 

 

s

 

H*+ 2 in. (51mm)+T

s

 

 

 

 

 

 

 

 

21/8 in.

 

 

 

 

 

 

 

(54mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16 in. (406mm)

D*

16 in. (406mm)

 

Min.

 

Min.

TYPE R

 

H* + 2 in. (51mm)+T

s

 

H*

21/8 in.

 

 

 

(54mm)

 

 

W*

 

 

16 in. (406mm) Min.

TYPE O

21/8 in. H*

(54mm)

W*

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

Combination Fire 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 80, 90A, 92A, 92B, 101, and 105 and further shall be tested, rated and labeled in accordance with the latest edition of UL Standards 555 and 555S. Dampers shall have a UL555 fire rating of 3 hours and be of low leakage design qualified to

UL 555S Leakage Class I.

Each damper /actuator combination shall have a UL555S elevated temperature rating of 350° F (177°C) minimum and shall be operational and dynamic 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 120 (24 or 230) volt operation or pneumatic type for 25 psi minimum (30 psi maximum) operation.

Damper blades shall be of the double skin airfoil type and shall have an equivalent 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. 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) and be UL 555S rated for leakage and airflow in either direction through the damper. Each damper shall be supplied with a 165°F (74°C) RRL. Testing and ratings to be in accordance with AMCA standard 500-D.

The basis of design is Greenheck Model FSD-331.

Copyright © 2008 Greenheck Fan Corporation FSD-331 Rev 1 March 2008

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Greenheck Fan FSD-331 dimensions Damper Sizing Information, Transitioned Damper Dimensions, Specifications

FSD-331 specifications

Greenheck Fan FSD-331 is a high-performance exhaust fan designed to provide efficient and reliable ventilation solutions in various industrial and commercial applications. With its robust construction and advanced engineering, the FSD-331 meets the demanding requirements of both indoor and outdoor environments, ensuring optimal air movement and safety.

One of the standout features of the FSD-331 is its state-of-the-art aerodynamic design, which maximizes airflow while minimizing energy consumption. The fan's blades are carefully engineered to reduce turbulence and noise, providing quieter operation compared to traditional exhaust fans. This makes the FSD-331 an ideal choice for noise-sensitive areas, such as schools, hospitals, and residential buildings.

The FSD-331 also boasts a direct-drive motor system that eliminates the need for belts and pulleys. This design not only reduces maintenance requirements but also enhances reliability, as there are fewer components that can wear and fail over time. The fan’s motor is designed to operate efficiently across a wide range of speeds, allowing users to adjust airflow as needed to accommodate varying ventilation demands.

Energy efficiency is a key characteristic of the FSD-331. It is available with various motor options, including high-efficiency models that comply with energy standards, helping building owners save on energy costs while reducing their carbon footprint. Additionally, the fan can be integrated with advanced control systems, such as variable frequency drives (VFDs), to further optimize performance and energy usage.

The FSD-331 is built to withstand challenging environmental conditions, thanks to its durable materials and weather-resistant features. Its housing is constructed from heavy-gauge steel, and options for protective coatings are available to enhance corrosion resistance. This durability ensures that the fan remains operational in harsh weather, making it suitable for rooftop installations and outdoor use.

The installation of the FSD-331 is straightforward, and it offers flexibility in mounting configurations, including horizontal and vertical orientations. This adaptability makes it easy to incorporate into existing systems or new construction projects.

In summary, the Greenheck Fan FSD-331 is an innovative solution for effective ventilation, featuring a high-performance design, energy-efficient operation, and robust construction. Whether for industrial processes, commercial buildings, or other applications, the FSD-331 is engineered to deliver reliable performance and significant operational savings.