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Rectangular Smoke Dampers-Class I leakage rated with 3V blades
The Rectangular Smoke Damper – Class I Leakage Rated with 3V Blades is engineered for smoke control applications requiring maximum air tightness and safety. Featuring precision-formed galvanized steel frames and 3V blades with edge seals, it ensures minimal air leakage and reliable operation under high temperature or emergency smoke conditions.
Product Features
Class I leakage performance (per AMCA 500-D or UL555S)
3V blade design for optimal air seal and strength
Galvanized or stainless steel construction
Optional electric or pneumatic actuator
Designed for horizontal or vertical installation
Factory-tested for airflow and leakage integrity
Technical Specifications
| Frame Material | Galvanized steel |
|---|---|
| Frame Material Thickness | 16 ga. (1.5mm) |
| Frame Type | 5 in. x 1in. (127mm x 25mm) hat channel |
| Blade Action | Parallel |
| Blade Material | Galvanized steel |
| Blade Material Thickness | 16 ga. (1.5mm) |
| Blade Type | 3V |
| Blade Orientation | Horizontal |
| Linkage | Plated steel out of airstream, concealed in jamb |
| Axle Bearings | 316SS |
| Axle Material | Plated steel |
| Blade Seals | Silicone |
| Jamb Seals | Stainless Steel |
| Mounting | Vertica/Horizontal |
Space Envelopes
Externally mounted actuators always require space outside of the damper sleeve. The “S” dimension illustrates the clearance required
for various available actuators.
Worst case space envelopes shown below. Exact dimensions may vary based on specifice damper configuration. Consult factory for
specific space envelope if necessary.
Contained Actuator Option
Dampers can be ordered with a “contained actuator option”. This option will result in the actuator being oriented such that it extends
no more than 11
⁄2 inches above or below the sleeve. Note that some damper configurations that are 11 inches high or less will have the
OCI mounted on the side opposite the actuator when the contained actuator option is selected.
no more than 11
⁄2 inches above or below the sleeve. Note that some damper configurations that are 11 inches high or less will have the
OCI mounted on the side opposite the actuator when the contained actuator option is selected.
Sleeve and Sideplate Dimensions
The drawings below and corresponding table show the position of the SMD-201 damper when mounted in a factory sleeve (“A”
dimension). 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 following options may affect the range of available mounting locations:
smoke detector, NEMA 7 enclosure, transitions, security bars, grille tabs.
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 16 in. (406mm) for the “A” dimension.
NOTE: Entire damper frame is not required to be installed within the wall. The damper
blades, when closed should be contained within the wall.
Transitioned Damper Dimensions
When a smoke damper is being used in conjunction with round or oval ductwork, the damper 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.
*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)
Multiple Section Dampers
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.
