Design: Wall or ceiling mounting; Nice circular design, no exposed screws, intake or exhaust use, used as vents to rooms outside and inside the building. Wide Application: This round vent can be used as part of a long duct run for a variety of purposes including whole house ventilation, passive ventilation, positive entry, air conditioning, HVAC, and heat recovery systems. Easy to use: Easy, simple and quick to assemble; Suitable for all elements of the 75mm ventilation system (both MM-T and others); Ventilation for living and working rooms but also for kitchens, bathrooms, toilets, garages. Ventilation size: Diameter 75mm, white round air vent cover, ventilation cover; Suitable for home decoration. Material: Our air vent is made of ABS, durable and strong; To cover wall or ceiling openings and ventilation ducts. Quantity delivered: 4 pieces