gravity louver non return damper - air distribution … · introduction “cosmos” non‐return /...
TRANSCRIPT
GRAVITY LOUVERNON RETURN DAMPER
INTRODUCTION
“COSMOS” Non‐return / Pressure relief / Gravity / Back draft dampers have been specifically designed for use in Air‐conditioning and Ventilation system, these dampers are air operated and are used for air intake and exhaust, and are also used for pressure relief.
Non‐return / Gravity / Back draft dampers can either be operated by gravity (where pressure or velocity opens and closes the damper) or be motorized to open and close when required. These dampers are composed of a set of horizontally mounted blades, they are normally closed and are free to rotate about the horizontal axis. The blades are manufactured from light weight aluminum sheets. Frame is manufactured from high quality aluminum as well as from galvanized steel.
Damper selection begins by determine the damper construction required based on system velocity and static pressure. While selecting the correct damper for our application, we need to know following
• System velocity and back pressure requirements.
• Mounting orientation and airflow direction.
• Mounting configuration ( Inserted into duct / opening or flange mount )
• Damper operation ( gravity or motorized )
• Start‐open pressure.
FEATURES
• The casing frame is fully sealed robust and rigid assembly formed out of best quality aluminum sheets / galvanized sheet steel of 1.2 mm thickness.
• Fully sealed low leakage blades are formed out of high quality light weight aluminum sheets of 1.0 mm thickness.
• The bearings are made of PVC/Nylon to give smooth and rattle free operation.
• The blades are fitted with galvanized steel connecting spindle to main casing / frame for rigid and strong construction for rattle free and smooth operation due to variable air pressure.
• A galvanized / aluminum angle is fitted internally to main frame to avoid over movement of blades.
COSMOS MODELS
Back draft Damper Pressure Relief damper Non Return Damper Gravity Louver
BDD‐F PRD‐F NRD‐F GRL‐F
BDD‐R PRD‐R NRD‐R GRL‐R
BDD‐C PRD‐C NRD‐C GRL‐C
BDD‐F‐G PRD‐F‐G NRD-G GRL‐F‐G
BDD‐R‐G PRD‐R‐G NRD‐R-G GRL‐R‐G
BDD‐C‐G PRD‐C‐G NRD‐C ‐G GRL‐C‐G
BDD‐H‐G PRD‐H‐G NRD‐H‐G GRL‐H‐G
STANDARD SIZES
H mm 150 200 300 400 500 600 700 800 900 1000 1200L mm 100 150 200 300 400 500 600 700 800 900 1000
***Also available in 25mm increments of any combination of H X L.
PERFORMANCE DATA
SPECTRUM INDUSTRIES