General Information
Application
- Multileaf dampers as a control element in volume flow rate and differential pressure control in ventilation and air conditioning systems
- For extremely low-leakage shut-off of ducts and openings in walls and ceiling slabs
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
Classification
Air leakage with closed multileaf damper according to EN 1751: test pressure up to 8.03 in w.g.
- Class 4
Nominal sizes
- B: 8 – 47 in, in increments of 0.04 in
- H: 4, 5, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 33, 35, 37, 39 in
- Any combination of B × H
Parts and characteristics
- Ready-to-install shut-off damper
- Blades with gears
- Drive arm
- Quadrant stay with blade position indicator
- Operating temperature 32 to 140 °F
Attachments
- Quadrant stays and limit switches for the infinite adjustment of the multileaf dampers and for capturing the end positions
- Open/close actuators for opening and closing multileaf dampers
- Modulating actuators for variable damper blade positions
- Pneumatic actuators for opening and closing multileaf dampers
Accessories
- Installation subframes for the fast and simple installation of multileaf dampers
Construction features
- Rectangular casing, with screws, material thickness 0.06 in
- Blades, material thickness 0.05 in
- Flanges on both sides, suitable for duct connection, with corner holes
- Encased gears on both blade ends
- Damper blade shafts, Ø0.47 in, with notch to indicate the damper blade position (not for attachment ZS99)
- With drive shaft as an attachment: For the position of the drive shaft see ‘Dimensions and weight’
- With actuator as an attachment: The actuator position at the first blade from the top (with up to 3 blades) or at the third blade from the top (with 4 or more blades)
- From H = 24 in with 2 spindles, with linkage
- Blade tip seals and side seals
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 = 24 in) 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
Standards and guidelines
- Casing air leakage to EN 1751, class C
- Closed multileaf damper air leakage to EN 1751, class 4
- Meets the increased requirements of DIN 1946, Part 4, with regard to the acceptable closed multileaf damper air leakage
Maintenance
- Maintenance-free, as construction and materials are not subject to wear
- Contamination should be removed as it may lead to corrosion and to increased closed multileaf damper air leakage
