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Damper

Construction

Damper

Construction

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Blade

Frame

Side

Seal

Blade

Seals

Johnson Controls

Damper Construction

Johnson Controls

Damper Construction

Airflow

CONTROL

Dampers

Linkage

(both sides)

Bearing

(self-

lubricating)

Blade Pin

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Johnson Controls

Damper Construction

Johnson Controls

Damper Construction

BALANCING

Dampers

Single Linkage

(right side)

Blade Pin

Blade

Frame

Airflow

Bearing

(self-

lubricating)

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Johnson Controls

Damper Construction

Johnson Controls

Damper Construction

ROUND

Dampers

Blade

Seals

(polyfoam

for low

leakage

control)

Blade Arm

Nylon Washer

(on 9-inch

larger

diameters)

Airflow

i

r

l

o

w

No

Seals

Snap Bushing

Retaining Ring

hroud

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Linkage

(both sides)

Bearing

(self-

lubricating)

Side Seal

Frame

Jackshaft

Blade

(no Blade Seals

this damper is not

leakage rated)

High Torque

Closure Spring

FIRE

Dampers

Johnson Controls

Damper Construction

Johnson Controls

Damper Construction

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Johnson Controls

Damper Construction

Johnson Controls

Damper Construction

SMOKE

Dampers

Linkage

Bearing

Blade Pin

Blade

Frame

Airfl

ow

Blade

Seals

Side Plate

(Used with external

mount actuators)

Airfl

ow

Side

Seal

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Johnson Controls

Damper Construction

Johnson Controls

Damper Construction

COMBINATION

Fire/SmokeDampers

Sleeve

Airfl

ow

Side Seal

(stainless

steel)

Silicone

Blade

Seal

Frame

Blade

Bronze

Bearing

(self-

lubricating)

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Framerame

Rigid 13 gauge construction

Eliminates vibration and noise when thedamper is exposed to high pressure andair flow

Square

Blades operate freely, without twistingor binding

Modular

Individual dampers can be quickly andeasily coupled to form multi-section units

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Control Damper Bladesontrol Damper Blades

Mustwithstandhigh staticpressures &velocities

Provide low

leakage rates Generate

minimumnoise

Single-Piece Value Blade

ingle-Piece Value Blade

Single layer of rolled sheet metalSingle layer of rolled sheet metal Side and blade seals standardSide and blade seals standard Available in 1 inch (25.4mm) incrementsAvailable in 1 inch (25.4mm) increments

Class III

Performance Blade

erformance Blade

2 layers of rolled sheet metal, mechanically joined2 layers of rolled sheet metal, mechanically joined Side and blade seals standardSide and blade seals standard Available in 1 inch (25.4mm) incrementsAvailable in 1 inch (25.4mm) increments

Class II

Airfoil Blade High Performance

irfoil Blade High Performance

Extruded aluminumExtruded aluminum Side and blade seals standardSide and blade seals standard Available in 1 inch (25.4mm) incrementsAvailable in 1 inch (25.4mm) increments

Class I

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Preferred

Drive Blade

(Connect

Actuator)

Label Indicating

Preferred Drive

Blade

Drive Bladerive Blade

One blade in a multi-blade damper is designated asdrive blade

Actuator connects to this blade

All other blades connected to this blade by linkage

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Stainless Steel

Side Seals

Blade

Seals

Damper Sealsamper Seals

Placed on side of

damper and on edge ofblade

Dampers with sealshave lower leakage rate

Important in applicationsImportant in applicationswhere the flow of air mustwhere the flow of air mustbe fully shut off, such asbe fully shut off, such asoutdoor air intakesoutdoor air intakes

Dampers without seals

have higher leakagerate Require less torque toRequire less torque to

operateoperate

Can use smaller actuatorCan use smaller actuator

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Parallel Blades

Rotate in

same direction

Opposed Blades

Rotate in

opposite direction

Damper Linkageamper Linkage

Connects drive blade to other blades,assuring simultaneous rotation

Both sides of damper to ease installation

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Multi-Section Dampersulti-Section Dampers

Coupled to create large,multi-sectioned units

Considerations

Reinforcement needed?

Some form of reinforcement cross-bracing, or structural support should

be installed for dampers subjected tohigh pressures or high air velocities

Correctly aligned?

Each section must be vertically andhorizontally aligned.

If necessary, install shims to bringeach section into alignment.

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Actuatorsctuators

HVAC controller sends signal to actuator

Actuator provides torque to open and closedamper blades

Electric actuators Directly connect to drive blade of damperDirectly connect to drive blade of damper

Indirectly coupled with linkageIndirectly coupled with linkage

Pneumatic actuators Use a piston rod, crank arm, and linkageUse a piston rod, crank arm, and linkage

arrangement to drive damper bladesarrangement to drive damper blades

Mounting brackets and hardware kits areavailable to couple actuator to damper