ventilation cap

例句：

1. 1. The ventilation cap is designed to keep the air in the room fresh and clean.
   通风帽的设计是为了保持房间内的空气新鲜和清洁。
2. 2. The ventilation cap helps to prevent dust and debris from entering the room.
   通风帽有助于防止灰尘和碎片进入房间。
3. 3. The ventilation cap is a crucial component of any HVAC system.
   通风帽是任何HVAC系统的关键组成部分。