Size of the ventilation duct: 90 mm (external dimension 140 mm, internal dimension 90 mm) / Color: White Slats inclined to direct the air flow. Equipped mosquito net Ventilation system for outdoor use. inside and outside the exterior of buildings, made of high quality material (high quality PVC plastic) resistant to external influences. They do not corrode and retain their beautiful appearance throughout their service life. They retain their technical and hygienic properties under changing operating conditions. Safe use. Easy and quick to install. It can also be installed à with silicone (not included in the kit). Suitable for all elements of ventilation systems up to Ø 90 mm.