20mm, 25mm, 32mm, 40mm, 46mm(optional).
20/25/32/40/46mm Inlines Pipe Fan for Efficient Air Circulation in Supermarkets
USB Wall Mounted Fan for Efficient Air Circulation in Dorms and Offices
Reliable Round Air Vent Grille for Efficient Air Circulation in Any Space
Compact Solar Panel Fan for Improved Air Circulation in Pet Houses and Kitchens
Powerful Wall Mounted Fan for Optimal Air Circulation in Limited Spaces
