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Non Return Damper (NRD)

Non Return Damper ( NRD ) 
* This dampers are designed for use in intake and discharge opening in commercial and residentiol air conditioning systems. when the ventilation system is on, the blades of the non return damper are held in the open position by the air flow.if the system is switched off , the damper blades close automatically , thus preventing reverse airflow and giving protection against the ingress of untemperd air, rain and birds in to the air conditioning system.

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DISCRIPTION

Non Return Damper ( NRD ) 
* This dampers are designed for use in intake and discharge opening in commercial and residentiol air conditioning systems. when the ventilation system is on, the blades of the non return damper are held in the open position by the air flow.if the system is switched off , the damper blades close automatically , thus preventing reverse airflow and giving protection against the ingress of untemperd air, rain and birds in to the air conditioning system.

CONSTRUCTION

Casing : casing made from 0.9 mm galvanized steel.
Blades : interlocking blades made from 0.7 mm galvanized steel.
Gasket : neoprene or rubber gasket is provided on blade tips for low leakage.
Versions
* Non Return Dampers wall mounted.
* Non Return Dampers duct mounted.
* Pressure Relief Damper wall mounted.

OPTIONAL EXTRAS

* RAL 9016,9010,9005,1015. other RAL colors available upon requast.
* Brass and PVC bushes version dampers available.
* Aluminium and stainless steel dampers available.
* Damper with Actuator upon requast.

SI UnitsIP Units
Length (mm)Width (mm)Length (inches)Width (inches)
50050020″20″
60060024″24″
80080032″32″
1000100040″40″
1200120048″48″
1400140056″56″
1600160064″64″
1800180072″72″
2000200080″80″

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