Views: 0 Author: Site Editor Publish Time: 2019-09-10 Origin: Site
1. The pipe should be hard and durable: it must be used 24 hours a day, and the service life must be at least 3 years.
2. The pipe can't leak air.
3. The material is better.
4. The ventilation time cannot be delayed for too long.
5. The upper cover cloth should be waterproof and breathable.