HD-LL Series Heavy Duty Low Leakage Damper
Verified by manufacturer 3 days ago
Flangefit
Flangefit
Heavy-duty low leakage damper designed for use in HVAC systems requiring air control and low closed blade leakage performance.
Application
For internal use in buildings within HVAC systems where air control and low closed blade leakage performance is required.
- Suitable for environments where maintaining low leakage is critical (e.g. data centres).
- Suitable for velocities up to 20 m/s and duct pressure to 2000 Pa.
Description
The HD series damper range offers blade profiles that provides air volume control through to low closed blade leakage characteristics, that have been designed for systems where high air pressures and velocities are involved.
The aerodynamic blade profile encourages smooth airflow offering minimal pressure drop. Side covers are fitted to the flanged case not only ensuring that the dampers meet Class C case leakage of DW144, but additionally safeguarding against hands and foreign objects
being placed into the path of the moving linkage. Available in a range of different sizes and configurations.
Features and benefits:
- Standard case construction is galvanised mild steel.
- Low leakage blade.
- Four case options.
- Control is either manual, specified Belimo actuators, or extended spindle control, allowing on-site conversion without special tools.
- Enclosed drive mechanism out of airstream.
- Easy transition from manual control to motorised and conversely.
- Can be supplied with blades and case in Grade 430 and 316 stainless steel.
- Air control and system balance.
- Variable flange dimensions and casing depths.
- Stainless steel side seals option to order.
- Flanged case dampers include side covers enclosing the drive linkage ensuring Class C case leakage.
- Vertical blade support that complies with DW144 available.
General information
Color | Silver |
Finish | Galvanized Stainless steel |
Material | Steel Stainless steel Aluminium |
Shape | Circle Oval Rectangle Square |
Length | Bespoke |
Width | Bespoke |
Height | Bespoke |
Uniclass | |
CAWS | U90/140 Mechanical supply ventilation U9/313 Mechanical ventilation with heat recovery units U9/120 Mechanical ventilation with heat recovery systems |
Specification data - Volume control dampers
Classification data | |
Standards | Conforms to HVCA specification DW144. Case leakage A, B and C. Conforms to Eurovent 2/2 classes A–C |
Format | Opposed blades. Guidance for specification option: Standard. Parallel blades. |
Performance characteristics | |
Airflow range | Aerodynamic performance to EN 1751. |
Leakage class | Class 3. Guidance for specification option: To EN 1751. |
Casing leakage class | C. Guidance for specification option: With side covers. |
Operating temperature range | +5 to +70°C. Manufacturer guidanceExposure to moist low temperatures may allow condensation to form and crystalize. this may impact on the ability to open the damper blades. |
Materials | |
Casing | 1.2 mm (18 swg) galvanized mild steel to BS EN 10346 specification DX 51D Z275. Guidance for specification option: Standard. Stainless steel type 1.4016 ferritic to BS EN 10088-2. Stainless steel type 1.4401 austenitic to BS EN 10088-2. |
Blades | Aluminium airfoil balance air control blades (A). Guidance for specification option: Extruded airfoil aluminium to BS EN 755 Part 9 specification 6063 T6, wall thickness 1.3 mm. |
Spindles | Manufacturer's standard. |
Control | |
Method | Manual quadrant control (H). Electric actuator (M). Guidance for specification option: Consult manufacturer for options and insert required voltage/ model. |
Extended spindle | Required. Not required. |
Type | HD-LL. |
Model | HD-LL-F. |
Dimensions | Guidance for specification option: Insert requirements:
Multiple section assemblies can be specified, to be supplied loose for assembly on site, with joining sections that provide spigot connection continuity. |
Profile | Air control low leakage. |
Accessories | Grade 316 stainless steel blade and drive spindles. Guidance for specification option: Replaces standard galvanized mild steel tube. None. |
Sustainability data
Country of product manufacture | United Kingdom |
Material | Steel Stainless steel Aluminium |
Literature
HD Series Heavy Duty Air Control and Low Leakage Dampers Brochure
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