Trox - Model JZ-LL-AL -Multileaf Damper

• Maximum dimensions 1200 × 1000 mm
• Closed multileaf damper air leakage to EN 1751, class 4
• Casing air leakage to EN 1751, class C
• Aerofoil opposed action blades
• Closed cell side seals meet increased hygiene requirements
• Blades interconnected by gears
• Available in standard sizes and many intermediate sizes

Optional equipment and accessories

• Actuators: Open/close actuators, modulating actuators
• Powder-coated construction
• Anodised construction

Multileaf dampers with gears can only have opposed action blades.

The internal gears transfer the synchronous rotational movement from the drive arm to the individual blades.

The torque for closing a multileaf damper must be dimensioned so that the damper can be safely opened and closed. For closure, the torque must suffice to ensure complete shut-off by the blades. Opening is initiated without aerodynamic forces. When air flows through the damper, the aerodynamic forces of the airflow create a closing force (torque) on the blades; this happens independently of the direction of the airflow. This closing force must be countered, or overcome. The blade angle α with the largest torque depends, among other things, on the fan characteristics.

• Nominal sizes: 200 × 100 mm – 1200 × 1000 mm
• Maximum permitted static differential pressure for a closed multileaf damper: 2000 Pa
• Operating temperature: 0 to 60 °C

Rectangular multileaf dampers for volume flow and pressure control as well as for low-leakage shut-off of ducts and openings in walls and ceiling slabs. Ready-to-operate unit which consists of the casing, aerofoil blades and the blade mechanism. Flanges on both sides, suitable for duct connection. The blade position is indicated externally by a notch in the blade shaft extension. Closed multileaf damper air leakage according to EN 1751, Class 4. Casing leakage according to EN 1751, Class C.

Special features

• Aerofoil blades
• Low-maintenance, robust construction
• No parts with silicone
• Available in standard sizes and many intermediate sizes
• Closed cell side seals meet increased hygiene requirements

Materials and surfaces

• Casing and blades made of extruded aluminium sections
• Blade shafts, bearing plate and drive arm made of galvanised steel
• Linkage (from H = 600 mm) made of galvanised steel
• Gears made of PBS plastic
• Blade tip seals made of PE/PTV plastic
• Side seals made of closed cell EVA foam
• P1: Powder-coated, RAL CLASSIC colour
• PS: Powder-coated, DB colour
• S3: Anodised, colour according to EURAS standard, E6-C-0

Technical data

• Nominal sizes: 200 × 100 mm – 1200 × 1000 mm
• Maximum permitted static differential pressure for a closed multileaf damper: 2000 Pa
• Operating temperature: 0 to 60 °C

Sizing data

• q_v  (m³/h)
• Δp_t [Pa]

Air-regenerated noise

• L_PA [dB(A)]