An air gap is a device used in plumbing to prevent the backflow of wastewater into the clean water supply. It creates a physical separation between the supply lines and the drainage system, ensuring that contaminated water cannot flow backward and contaminate the potable water supply.
In the context of a washer/dryer combo unit, the air gap is typically associated with the washing machine function rather than the dryer function. The air gap for a washer prevents the wastewater from the washing machine from siphoning back into the household water supply, which could potentially lead to contamination.
While a washer/dryer combo unit combines both washing and drying functions into a single appliance, it is mainly the washing machine portion that requires an air gap. The reason for this is that during the washing process, water is used to clean the clothes, and this water needs to be drained away after use. If there is a sudden drop in water pressure or a blockage in the drainage system, a siphoning effect could occur, pulling wastewater back into the water supply. The air gap prevents this backflow by providing an open gap in the drainage line.
The dryer function of the combo unit usually does not require an air gap because it doesn't involve the use of water. Instead, the dryer relies on hot air to evaporate the moisture from the clothes, and the resulting water vapor is vented outside the unit through a separate vent.
Keep in mind that plumbing codes and regulations may vary depending on your location, so it's essential to check with local building codes or consult a professional plumber to determine if an air gap is required for your specific washer/dryer combo unit installation. Compliance with local regulations ensures the safety and proper functioning of your appliances and plumbing system.