The ventilator should be mounted on the casing with a nameplate, and a red arrow signboard should be installed on the casing to indicate the direction of extraction and exhaust.
The ventilator shall have a nameplate mounted on the housing, and a red arrow sign with a wind direction shall be installed on the case, indicating the direction of the pumping and exhausting.
The fan shall be provided with a nameplate mounted on the enclosure, and a red arrow sign of wind direction shall be mounted on the enclosure to indicate the direction of suction and exhaust.<br>