Versions: EFR 10, EFR 12: 1 speed, EFR 10 R, EFR 12 R: 5 speeds, for base load operation one of the 4 stages can be selected. Stage 5 (maximum) is controlled via an additional contact, e.g., light switch or hygrostat. The run-on time is adjustable in the device via a potentiometer (3 - 25 minutes). Installation in ventilation ducts DN 100 and DN 125. Minimal dimensions for installation in tight spaces. Ideal for renovation. Radial impellers with backward-curved blades. Connection ports on both the suction and pressure sides for direct installation in ventilation ducts. Protection class IP 20. Motor: Thermal overload protection is standard. Robust motor with ball bearings, maintenance-free. Installation notes: Installation possible in any position. With mounting plate for wall and ceiling installation. Article: EFR 12, Airflow volume: 255 m³/h, Speed: 2392 1/min, Impeller type: radial, Rated voltage: 230 V, Mains frequency: 50 Hz, Rated power: 53 W, PMax: 53 W, IMax: 0.24 A, Protection class: IP 20, Power supply: 3 / 1.5 mm², Installation location: ceiling, Installation position: vertical / horizontal, Material: galvanized steel sheet, Housing material: galvanized steel sheet, Color: silver-gray, Weight: 4.2 kg, Weight with packaging: 4.65 kg, Fan pivotable: yes, Nominal diameter: 125 mm, Width: 241 mm, Height: 122 mm, Depth: 448 mm, Width with packaging: 265 mm, Height with packaging: 170 mm, Depth with packaging: 470 mm, Medium temperature at IMax: -20 °C to 50 °C, Ambient temperature: 50 °C, Sound pressure level: 37 dB(A) / distance 3 m, Free field conditions.