100 mm Diameter: Ventilation grille, screw-mounted – White Ø 100 mm. Available in white, red, grey, and black. Used for ventilation in walls, drain pipes, and older ventilation systems With built-in insect screen Dimensions (A×B×C): 135×100×43 mm Air passage: 25 cm² 2 pcs 75 mm Diamater: Ventilation grille, screw-mounted – White Ø 75 mm. Available in white, red, grey, and black Used for ventilation in walls, drain pipes, and older ventilation systems With built-in insect screen Dimensions (A×B×C): 113×78×40 mm Air passage: 18 cm² 2 pcs