Negative pressure fan, also known as industrial exhaust fan, is a device that uses air convection and negative pressure

In the fast-paced modern life, people spend an average of over 80% of their time indoors.

When designing a ventilation system, the standardization and rationality of the drawings will determine the progress and

Have you ever sat for a long time in an airtight room and suddenly felt a strong dizziness, as if your head was shrouded