SPECIFICATION: Color: grey Fi [mm]: 125 Dimensions [mm]: 170 x 170 Surface-mounted ventilation grilles with round outlet opening. Used as supply and exhaust ventilation grille for rooms inside and outside the building. Recommended for installation in spiro pipes and other ventilation systems. The advantage of this ventilation grille is the (integrated) mesh cast into the production process, which keeps insects away from the apartment. The unique method involves incorporating the mesh into the design at the production stage, so it doesn't get dirty, tear, or damage, and is the same color as the grille – permanently retains its aesthetic value. The shape of the louver directs the air "downward" so there is no cooling effect in the rooms where our ventilation grille is installed. **