Electric shutter as weather protection and cold air barrier when the fan is switched off. MK with gear motor: Nominal power 3 W, nominal current 0.015 A. BK with bimetal flap: Nominal power 25 W, nominal current 0.01 A, starting current 1.8 A - 1s. Speed control only with speed controller STU 2.5 / ST 2.5. Version in accordance with protection class II (without protective conductor connection). Opens and closes when the fan is switched on and off. MK requires 4-core power cable. BK requires 3-core power cable. Special versions with limit switches available on request. Limit switch responds when the cover flap is fully opened. Article: MK 31, pressure loss: 11 Pa, voltage type: alternating current, rated voltage: 230 V, mains frequency: 50 Hz, rated power: 3 W, INom: 0.015 A, maximum load: 0.015 A, protection class: IP 55, drive: gear, installation: outside, installation location: wall, installation position: vertical, material: plastic, color: traffic white, similar to RAL 9016, slat color: silver gray, weight: 1.865 kg, weight with packaging: 2.115 kg, flap type: electric, suitable for nominal width: 315 mm, width: 430 mm, height: 430 mm, depth: 50.5 mm, width with packaging: 440 mm, height with packaging: 440 mm, depth with packaging: 60 mm, ambient temperature: 40 °C, Suitable for box fans: no, Suitable for roof fans: no, Suitable for pipe fans: no, Suitable for heat recovery systems: no, Suitable for wall-mounted fans: no, Suitable for wall-mounted fans: yes, Suitable for residential fans: no, Suitable for centrifugal fans: no, Suitable for circulation fans: no
| Property | Value |
| Material: | Plastic |
| Front height: | 430 mm |
| Front width: | 430 mm |
| Depth: | 50.5 mm |
