The 609 Series is multifunction heavy duty overhead door closer with rack-and-pinion technology. It is recommended for fire doors and suitable for DIN drilling template (standard link arm and guide rail). It is suitable for door leafs up to 1400 mm wide with link arm and up to 900 mm with guide rail. Variable closing force 3-6 accoding to EN 1154 standards (EN 1-3 with guide rail). It is CE certified for use with fire-rated doors (with standard link arm and with guide rail). Equipped with thermostatic valves for indipendent hydraulic control of closing speed and final latch. The installation on narrow profiles doors is made easy by back plate AC174 (optional). Variants: With standard link arm With hold open link arm With guide rail