The Helios MF 90 is a compact mounting flange designed for use with duct fans, domestic ventilation units, and heat recovery systems. Constructed from durable plastic in an alpine white finish, it has a depth of 23 mm, making it especially suitable for installations in confined spaces such as narrow shafts or ceilings. The MF 90 simplifies and stabilizes the mounting process and is specifically compatible with Helios HR 90 units. This accessory ensures a clean, secure, and professional installation in space-limited environments