Greenheck HTD-636 User Manual

Application and Design

Model HTD-636 is a heavy duty flanged frame style
industrial control damper qualified for use in tunnel and
transit systems. The airfoil blades, mechanically fastened
silicone blade seals and stainless steel jamb seals meet
the demanding requirements for strength, leakage, and
operability to standards such as NFPA-130, 502, and
UL555S.

HTD-636 has been tested in accordance with BS476 to
4 hours at Warrington Fire, UK, and is approved for fire
partitions of 4 hours or less where British Standards are
required.

Standard Construction

Frame Depth 12 in. (305mm)

Flange Width 2 in. (51mm)

Frame Material Galvanized (ASTM A653)

Frame Material Thickness 12 ga. (2.7mm)

Blade Type Fire rated double skin airfoil

Blade Material Galvanized (ASTM A653)

Blade Skin Thickness 16 ga. (1.5mm)

Axle Type Stub

Axle Diameter 0.75 in. (19mm)

Axle Material Zinc plated steel

Bearing Stainless steel sleeve

Linkage External industrial type, zinc plated steel

Blade Action Parallel

Axle Seal None

Blade Seal Mechanically fastened silicone

Jamb Seal Compression type, stainless steel

Blade Deflection L/180

HTD-636

Steel Airfoil Blades

Tunnel Transit Damper

Ratings

Fire: BS476, Four hours
Pressure: 24 in. wg (6 kPa)
Velocity: 4000 fpm (20.3 m/s)
Temperature: 482°F (250°C) for 2 hours (NFPA 130, 502)
Fatigue Cycles: 8 million reverse cycles at 24 in. wg

(6 kPa)

H*

W* **

Size Limitations

The following table provides minimum and maximum

single section size. Multiplie sections can be linked

together to create larger damper assemblies.

Single Section Size

Minimum 12 in. W x 12 in. H

(305mm x 305mm)

Maximum 48 in. W x 96 in. H

(1219mm x 2438mm)

Installation instructions available at www.greenheck.com.

* Actual Inside Dimension

** The W dimension is ALWAYS parallel with the damper blade
length.

Options

• Wide range of electric and pneumatic actuators available

• Limit Switches

• Multiple panel assemblies

• Mounting holes in anges

• Other materials and frame congurations are available.
Consult factory with your specic requirements.

• Blade deection - L/360

Multiple Panel Assemblies

Multiple panels can be stacked on top of each other and side­by-side to span opening that are larger than the maximum single
panel damper. Jackshafting can be added to couple multiple
panels, allowing them to be operated using a single actuator.
Consult the factory for design assistance for multiple panel
assemblies.

Pressure Drop Data

This pressure drop data was conducted in accordance with
AMCA Standard 500-D using the two configurations shown. All
data has been corrected to represent standard air at a density of
.075 lb./ft

Actual pressure drop found in any HVAC system is a combination
of many factors. This pressure drop information along with an
analysis of other system influences should be used to estimate
actual pressure losses for a damper installed in a given HVAC
system.

AMCA Test Figures

Figure 5.3 Illustrates a fully ducted damper. This configuration

has the lowest pressure drop of the two test configurations
because entrance and exit losses are minimized by straight duct
runs upstream and downstream of the damper.

Figure 5.2 Illustrates a ducted damper exhausting air into an
open area.

3

(1.2 kg/m3).

HTD-636ASSEMBLIES & PERFORMANCE DATA

4D 6D

Fig. 5.3

4D

Fig. 5.2

Pressure Drop (english version)

42 in. x 42 in. (1067mm x 1067mm) Damper

AMCA 5.2

AMCA 5.3

x

Figure 5.2: Log (P) = 2*Log (V) - 7.507618
Figure 5.3: Log (P) = 2*Log (V) - 7.977296

Pressure Drop (metric version)

42 in. x 42 in. (1067mm x 1067mm) Damper

AMCA 5.2

AMCA 5.3

FACE VELOCITY - METERS/SECOND

Figure 5.2: Log (P) = 2*Log (V) - .522991
Figure 5.3: Log (P) = 2*Log (V) - .992669