• Obtain cross ventilation by opening windows or louvers located not on the same walls;
• Switch on circulating fan to enhance air movement within premises; and
• Install exhaust fans.

Mechanical Exhaust Fan

A propeller fan is installed over an external wall, where indoor air actively extracted out.

• Switch on exhaust fan at any time;
• Open some windows or louvers for sufficient replacement of air (to obtain the better result by opening windows or louvers located not on the same wall and/or having long distances to the exhaust fan in order to prevent short circuit of air flow);
• Switch on circulating fan to enhance air movement within premises;
• Remove any obstruction to the ventilation inlet or outlet; and
• Clean the exhaust fan regularly.

Mechanical Fresh Air Supply Fan

Similar to the exhaust fan, the fan, however, is reversed to deliver the fresh air in.

• Less effective than exhaust fan in controlling airflow;
• Switch on the supply fan at any time;
• Open some windows or louvers for sufficient venting (to obtain the better result by opening windows or louvers located not on the same wall and/or having long distances to the fresh air supply fan in order to prevent short circuit of air flow);
• Switch on circulating fan to enhance air movement within premises;
• Remove any obstruction to the ventilation inlet or outlet; and
• Clean the fan and the air filter regularly.