【Ventilation Leaf with Round Fan Lock】: The ventilation leaf has 6 holes, easy installation, low noise, high precision mirror polished surface, higher accuracy, higher brightness, dustand foreign matter is not easy to be blocked and the air volume is controllable. 【Stainless Steel Ventilation Rosette】: High quality stainless steel ventilation rails are weatherproof and heat resistant, 125mm outer diameter. It can be used perfectly for indoor exhaust,less noise, and can also be used for decoration. 【Adjustable ventilation】: Adjustable ventilation plate with locking mechanism according to your ventilation needs. and allow freely adjustable air supply or can be completely closed. If you want to bringfresh air in a room according to your needs, you are making the right choice. 【Simple and Durable】: The ventilation panel can be adjusted to your ventilation needs via the locking mechanism to keep the air fresh and circulating. It can also be used to keep flies or other insects away.