Quantity: 4 pieces (straight leaves) Design: wall or ceiling mounting; Attractive round design with no exposed screws, intake or exhaust use, as vents for rooms inside and outside the building. Wide range of applications: This circular vent can be used as part of a long duct for a variety of purposes including whole house ventilation, passive ventilation, positive air intake, air conditioning, HVAC and ventilation systems. heat recovery. Ease of use: easy, simple and quick to assemble; suitable for all elements of 75mm ventilation systems (MM-T and others); ventilation for living rooms and studios, also suitable for kitchens, bathrooms, toilets, garages. VENT SIZE: 75mm diameter, white round vent cover, vent cover; suitable for home decoration. Material: Our air outlet is made of ABS material, which is strong and durable; covering wall or ceiling openings and ventilation ducts.