DR14

For dampers up to : 250mm mm(10") Diameter

Set includes: 

Dial parts with handle 

Wing nut,washer & bolt

1/4" spring loaded end spindle 

1/4" Square spindle

Packing : 100 sets per carton

PVA

The pressure relief valve PVA is used for preventing the reverse of air-flow in circular duct systems.

The casing of PVA is made from galvanized steel, the blades are amde of aluminuim.

With a inner foam seal for better tightness and noise reduction.

The valve opens when overpressure occurs and closes by means of spring when the pressure drops.

It is recommended to install the shutter into horizontal ducting.

PVB

The pressure relief valve PVB is used for preventing the reverse of air-flow in circular duct systems.

The casing of PVB is made from galvanized steel, the blades are made of aluminium.

The valve opens when overpressure occurs and closes by means of spring when the pressure drops.

It is recommended to install the shutter into horizontal ducting.

Rectangular back draught shutter -PVR

Used for rectangular fan to prevent the reverse of air-flow 

The frame is made of steel and the blade is made of aluminum.

Rubber part on the blades avoid noise.

Powder coated in white or other colors.

Size:25 GASC(25cm/10"), 30GASC(30/12"), 35GASC(35/14"),40GASC(40/16"),45GASC(45/18"),50GASC(50/20"),60GASC(60/24")