Knut Bø MURO 120 K is a 5-inch wall or ceiling exhaust fan with an integrated non-return damper, delivering 180 m³/h at free discharge. The damper closes when the fan stops to block back-draught through the duct. Typical use is bathroom, WC and small utility-room extraction where a Ø125 mm duct spigot is available. Manufactured in Italy.