304 Stainless Steel Unpowered, 300mm Type Wind Ball Hood Roof Ventilator Factory, Exhaust Replacement Balloon (Size : 200MM)

[Product name] Unpowered hood.[Product material] 304 stainless steel[Product Features] Zero energy consumption, no rust, zero noise and no leakage

• Works without electricity - takes advantage of natural wind and thermal convection between indoor and outdoor air
• Bearing steel balls are used, and each steel ball is precision ground to ensure that the machine works smoothly and smoothly.
• The arc-shaped fan blades are the result of calculations and can strictly ensure that rainwater will not intrude under working conditions. The exhaust efficiency is high and it can still operate easily and effectively when the breeze is no less than 0.2 meters or the indoor and outdoor temperature difference exceeds 0.5°C.
• 100-200mm comes with its own clamp, and 300mm comes with its own fixed feet.
• 100-200mm requires no assembly and can be used after opening. 300mm needs to be assembled by yourself (parts)