Schweigen Silent Undermount Rangehood Silent 900mm (900M3/HR) Stainless Steel Product Code: UM-PA9ST Overall Dimensions: 895mm W x 295mm D x 454mm H Finish: Stainless Steel Control: Push Airflow: 650 Flue Size: 200mm Fan Speed Levels: 4 Lights: 1 x Strip LED Noise Level at High: Silent Features: Schweigen is German for silent. But there's more to it than just a name. Its high-pressure-building fan delivers the highest domestic suction and pressure available. And because it's located outside the home (roof or side walls), it's silent where it counts: in the kitchen! Proven sound engineering principles use ambient noise from outside to neutralise any sound from the Isodrive motor. Unlike other rangehoods, the Isodrive doesn't have to cope with doing two jobs at the same time... Sucking hot, soiled air from the kitchen and cooking area, then Pushing it uphill or around corners (or both) to the outside air... So there's no strain on the motor and only minimal air turbulence inside the rangehood and ventilation duct. Think of a rangehood system as an upside-down funnel. The rangehood opening is the large end at the bottom, while the outlet to the atmosphere is the narrow end at the top. Turbulence causes soiled air to deposit greasy, smoky residues inside rangehoods and ducts, attracting vermin and insect pests, and creating a dangerous fire hazard - right over the cooker! Schweigen's Isodrive system draws air quickly and freely to the outside with no obstructions to cause turbulence or any unhygienic, high-risk build-ups of grease and grime.