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 shutting off ducts and openings in walls and ceiling slabs
- Parallel action blades are preferably used for opening/ closing
- Due to their characteristics, opposed action blades are preferable for variable operation
- 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
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, 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
Variants
- JZ-S: Multileaf damper with opposed blade action, made of galvanised sheet steel
- JZ-P: Multileaf damper with parallel blade action, made of galvanised sheet steel
- JZ-S-A2: Multileaf damper with opposed blade action, made of stainless steel
- JZ-P-A2: Multileaf damper with parallel blade action, made of stainless steel
Construction
Duct connection
- Corner holes on both sides
- G: Flange holes on both sides
Bearings
- Plastic bearings, operating temperature -4 – 212 °F
- M: Brass bearings, operating temperature -4 – 302 °F
- E: Stainless steel bearings, operating temperature -4 – 302 °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 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 casing, welded (P1: casing with screws), material thickness galvanised steel 0.05 in, stainless steel A2 = 0.05 in
- Blades, material thickness 0.04 in
- Flanges on both sides, suitable for duct connections, either corner holes or flange holes
- External linkage, robust and durable, consisting of the coupling rod and horizontal arms
- Damper blade shafts, Ø0.5 in, with notch to indicate the damper blade position (not for ZS99)
- With spindle as an attachment: For the position of the spindle, see “Dimensions and weights”
- With actuator as an attachment: The actuator is always attached to the second blade from the top
- Construction and the selection of materials comply with the criteria stipulated in EU 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 or stainless steel
- Blade shafts, drive arms and external linkages made of galvanised steel or stainless steel
- Plastic, brass or stainless steel bearings
- P1: powder-coated, RAL CLASSIC colour
- PS: powder-coated, DB colour
Standards and guidelines
- Casing air leakage to EN 1751, class C
Maintenance
- Maintenance-free, given that construction and the materials used are not subject to wear
- Contamination should be removed as it may lead to corrosion and to increased air leakage in closed multileaf dampers
