Dryers need an air inlet from outside the building
The text in the pictures is in Thai, as originally posted.
🌬️ Small 30-50 lb dryers should have about 1 sq ft of outside air opening per machine
Drying slower even though the dryer isn't faulty? Could the dryer room be short of air?
According to IMAGE's dryer manual, a dryer draws in room air, heats it and blows it outside, so the room air has to be replaced from outside. For small dryers of around 30-50 lb, the manual gives a rule of thumb of about 1 sq ft (about 0.09 m²) of unobstructed opening to the outside per dryer. Larger models need more opening, and if the opening is covered by louvers or grilles, it should be larger than this. Openings can be shared, as long as air reaches every dryer evenly. The manual states that with too little air, drying becomes slower and less efficient, and the motor may overheat.
What you can do is check whether the dryer room has an outside air opening and that it is not blocked. This figure is a rough guide for small models; for actual sizes for each model, follow the machine's manual and local regulations.
Questions about your own dryer room? Ask the KHT team.