General Information
Application
- Multileaf dampers as a control element in the volume flow rate and differential pressure control in ventilation and air conditioning systems
- For low-leakage shut-off of ducts and openings in walls and ceiling slabs
- Steel and stainless steel variants with brass or stainless steel bearings are suitable for use in potentially explosive atmospheres (ATEX)
Special characteristics
- Aerofoil blades
- Low-maintenance, robust construction
- No parts with silicone
- Available in standard sizes and many intermediate sizes
Classification
Air leakage with closed multileaf damper according to EN 1751:Test pressure up to 8.04 in w.g.
- Up to B = 24 in, class 1
- From B = 24 in, class 2
Nominal sizes
- B: 8 – 79 in, in increments of 0.04 in
- Width subdivided (BM): 79 – 163 in, in increments of 0.04 in
- H: 7, 14, 20, 27, 33, 40, 46, 53, 59, 66, 72, 79 in (intermediate sizes 7 – 79 in increments of 0.04 in, except for standard size H – 0.04 in, H + 0.04 in, H + 0.08 in)
- Height subdivided (HM): 79 – 160 in, in increments of 0.04 in
- Any combination of B × H
Construction
Duct connection
- Corner holes on both sides
- G: Flange holes on both sides
Bearings
- Plastic bearings, operating temperature 32 – 212 °F
- M: Brass bearings, operating temperature 32 – 212 °F
- E: Stainless steel bearings, operating temperature 32 – 212 °F
Blades
Only for multileaf dampers made of galvanised sheet steel with brass or stainless steel bearing bushes (JZ-…-M, JZ-…-E)V:
Reinforced blades available as from width 32 in
Parts and characteristics
- Ready-to-install shut-off damper
- Blades with external linkage
- Drive arm
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
- Explosion-proof actuators for opening and closing multileaf dampers
Accessories
- Installation subframes for the fast and simple installation of multileaf dampers
Construction features
- Rectangular welded casing (P1: casing with screws), material thickness 0.05 in
- Blades, material thickness 0.04 in
- Flanges on both sides, suitable for duct connection, either flange holes or corner holes
- External linkage, robust and durable, consisting of the coupling rod and horizontal arms
- Blade shafts, Ø0.5 in, with notch to indicate the damper blade position (not for ZS99)
- With drive spindle as an attachment: For the position of the spindle, see ‘Dimensions and weight’
- With actuator as an attachment: The actuator is always attached to the second blade from the top
- Travel stop (angle section) ensures tight closure of the top and bottom blades
- Blade tip seals
- The construction and selection of materials comply with the criteria stipulated in European directives, referred to as ATEX (for use in potentially explosive atmospheres) for variants with brass or stainless steel bearings (-M, -E)
Material and surfaces
- Casing and blades made of galvanised sheet steel
- Blade shafts, drive arm and external linkage made of galvanised steel
- Blade tip seals made of PP/PTV plastic
- P1: Powder-coated, RAL CLASSIC colour
- PS: Powder-coated, DB colour
Standards and guidelines
- Casing air leakage to EN 1751, class C
- Meets the general requirements of DIN 1946, part 4, with regard to the acceptable air leakage with closed multileaf damper (from B = 24 in)
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 blade air leakage
