Unpowered s quickly discharge indoor hot gas and dirty gas, improve the indoor environment..
Roof Ventilation Fan Characteristics
③Running device: Using ball bearing, self lubricating, allowing it to rotate in breezes of less than 3.2KM/h.
, dust doesn't catch easily.
⑤ ’⑦Natural Lighting: There are gaps between the leaves, light enters indoors though it,
3. Roof Ventilation Fan
