Flush-mounted housing with fire protection coating K 90 and second room connection on the left. Outlet nozzle for main room on the side, upwards (delivery method), rotatable to the left or right. Metal outlet nozzle with automatic non-return valve and shut-off when fusible link is triggered*. Removable plug connection for electrical connection. Reusable hinged plaster cover. Connection DN 80 mm. Area of application: two-room ventilation of bathrooms and toilets. Installation in walls, ceilings and K 90 qualified ventilation shafts. Connection of 1 or 2 housings per floor up to 20 full floors possible. Fan use with 100 m3/h recommended *The non-return valve in fire protection housings also basically meets the requirements of a cold smoke shut-off valve.