Exhaust Fans
An exhaust fan is a device that uses a rotating fan connected to a motor to exhaust indoor air or draw air in from the outside. In addition to air supply and exhaust, it also plays a role in indoor deodorization, moisture proofing, and temperature control, etc. An ordinary exhaust fan is a fan mounted in a square box. In rooms that do not come into contact with outside air, a duct exhaust fan that ventilates through a duct above the ceiling is useful. A feature of exhaust fans is that their function differs depending on the type of blades. A propeller fan has a design in which multiple blades are arranged at equal intervals from a central circular part, and is mainly used mounted on a wall. The air it takes in is discharged directly to the outside, but it should be noted that the airflow will decrease from the impact of outside wind. A sirocco fan has a tubular design comprising elongated vertical blades, and can be installed away from walls as the blades of a duct exhaust fan. Its advantage is that it has stable airflow, but its suction power is smaller than that of a propeller fan.