PWII RECTANGULAR MULTI-BLADE DAMPER Characteristics: A rectangular multi-blade damper with backward blades used for airflow control and closing. Controlled manually or by an electric actuator. Intended Use PWII multi-blade dampers with backward blades are designed for airflow control or closing in rectangular ventilation ducts. Operating temperature: -20 °C to +90 °C, (+50 °C for the actuator version). PWII dampers hold hygiene certificate no. HK/K/0841/03/2017. Drive: T1 – Damper with an actuator T2 – Damper with a manual mechanism T3 – Damper with an extended axle (for the actuator installation) PWII-O dampers have housings and shutters (blades) Figure 2. PWII-U damper blade. Figure 3. PWII-O and PWII-N damper blade. made of galvanised steel profiles. PWII-U dampers have housings made of galvanised sheet steel and shutters (blades) made of aluminium profiles with edge gaskets. There is a tie rod made of galvanised steel on the gear wheels of the dampers measuring B > 1400 mm, which protrudes outside the housing. PWII-N dampers have housings and shutters made of sheet stainless steel (1.4301). PWII-U dampers have edge gaskets on blades and can be used to control and shut-off applications, while the others are mainly for control. Manufacturing Versions Type: PWII-U – Shut-off damper (a baffle with a gasket). PWII-O – Control damper (a baffle without a gasket), PWII-N – Stainless steel (1.4301) damper Rectangular multi-blade damper The design of PWII-O and PWII-N dampers ensures low air resistance when open and the design of PWII-U also guarantees a good level of tightness when closed. PWII dampers may be adjusted by a manual or automatic (actuator) control system. The housing is made of galvanised or sheet stainless steel. It can be powder coated. All PWII dampers have a raised flangeshaped body (30 mm). Shutters are connected with bearings and gears made of polypropylene (PP). Figure 1. PWII damper dimensions. Figure 2. PWII-U damper blade. Figure 3. PWII-O and PWII-N damper blade. Standard dimensions of PWII dampers: Width A = 100÷2500 mm (1 mm interval) Height B = 105÷2005 mm (100 mm interval) Due to the width of the blade, the recommended height is B = n x 100 + 5, where n is the number of the blades. It is possible to make the damper another height (1 mm interval), with a masking frame covering the clearance partially. The damper of width A > 1400 mm is divided into modules of maximum width 1400 mm. The modules are connected with a common driving axle (single manual mechanism or actuator). If it is necessary to use a damper larger than 2500 x 2005 mm, a combined damper consisting of two smaller dampers is made. The dampers have independent driving axles (two separate manual mechanisms or actuators on op

There is a tie rod made of galvanised steel on the gear wheels of the dampers measuring B > 1400 mm, which protrudes outside the housing. Above this value it is recommended that PWWp dampers are used. Types and characteristics of PWII dampers Table 1. Types and characteristics of PWII-x dampers. PWII-x PWII-O Housing Galvanised sheet steel Blade made of galvanised sheet metal Sheet stainless steel Aluminium blade with an edge gasket Stainless steel blade Flange-shaped body Gear wheels on the outside Table 2. Types of actuators and the net surface area for dampers in a fully open position. Height...

Table 3. Type of the actuator. without a spring Actuator torque Combined damper consisting of several smaller dampers. For a custom design – please contact Smay. (*) - Combined damper 2 x … Nm requires the use of two smaller dampers with separate actuators. The given actuator types can be used in several variants differing in communication and supply voltage. Chart 1. Pressure loss for a standard-height PWII damper (in a fully open position). Pressure loss in a custom-height damper (with a masking frame covering the clearance partially) is comparable to the pressure loss for the nearest smaller...

Table 4. Approximate weight of PWII dampers. apply to the dampers made of sheet steel, version Rectangular multi-blade damper

PWII - Rectangular multi-blade damper When ordering, please provide information as follows: PWII - - x - W - T - Where: P Version* U – Aluminium blades with PVC seals, a housing made of galvanised sheet metal O - Blades and housing made of galvanised sheet metal N - Blades and housing made of stainless sheet metal A Damper inner clearance width [mm] B Damper inner clearance height [mm] W Number of damper cross divisions [0 – none]* N Drive type* KL 1 – With an actuator** 2 – Manual mechanism 3 – For an actuator EN 1751 leakage class* BX – Housing: B, baffle: none (a baffle without a gasket) B1...