Wallas-code: 4414
This adapter can be used when changing a heater with 60mm ducts for heaters with 75mm ducts. Also the Dt- heater installers may use these adapters to boost the air speed at the end of the duct, for example for the windshield. Moreover, you can reduce a 75 mm duct to a 60 mm one spaces to decrease the heat in that space.
Dimensions: 60 mm / 75 mm