The VILPE Multifunction Grille works as a ventilation grille for different types of spaces, and can also be used as an intake or exhaust vent for mechanical ventilation systems. If the product is to be used as a ventilation grille in a natural ventilation system, it is ready for use as it is. In a mechanical ventilation arrangement, an intake or exhaust air duct can be attached to the product–in this case, a duct fitting plate is required in addition to the vent. The ventilation grille can also be fitted with an insect net, which is supplied as an accessory, and it can be opened and locked for cleaning with an easy lock mechanism. The unique airflow design of the Multifunction Grille results in a large cross-sectional area in both directions of flow and good water/snow shedding properties. The pressure loss of the new Multifunction Grille is the smallest of any on the market for both intake and exhaust air. Multifunction Grille 150 x 150: Effective area 84,5 cm2. When used in a mechanical ventilation system, a Ø 60 or 100 mm duct fitting plate is required. Multifunction Grille 240 x 240: Effective area 248 cm2. When used in a mechanical ventilation system, a Ø 125, 160 or 200 mm duct fitting plate is required. Multifunction Grille 375 x 375: Effective area 517 cm2. When used in a mechanical ventilation system, a Ø 200, 250 or 315 mm duct fitting plate is required.