Main Features; Speed-controllable Integral thermal contacts Can be installed in any position Inclusive mounting bracket Maintenance-free and reliable The RVK series is designed for installation in ducts. The casing is manufactured from PA6 fibreglass reinforced plastic which gives the fan a less leckage casing. Duct connected wet room applications of the fan are possible due to the air tight casing and the IP 44 rated terminal box.The fans have backward-curved blades and external rotor motors. The FK mounting clamp facilitates easy installation and removal, and prevents the transfer of vibration to the duct. The fans can be speed-controlled via a stepless thyristor or a 5-step transformer. The RVK fans have integral thermal contacts with automatic reset. Sound Pressure Levels; 100E2 4” – 34.5dB 125E2 5” – 37.5dB 150E2 6” – 40.6dB 150E2-L 6” – 44.8dB 200E2 8” – 42dB 250E2 10” – 39.7dB 250E2-L 10” – 41.9dB 315E2 12” – 45.4dB