The exhaust of an oven and refrigerator blowing out warm air is a result of their normal operation. Let's look at each appliance separately:
Oven: When you use an oven, it heats up the interior to the desired temperature for cooking. The warm air is circulated within the oven to maintain the set temperature. As the oven operates, excess heat builds up inside, and to prevent overheating, the oven has a ventilation system. The warm air is expelled through the exhaust vent, which helps regulate the oven's temperature and prevent damage from excessive heat.
Refrigerator: A refrigerator works by removing heat from its interior to keep the contents cool. It does this through a process called refrigeration. The refrigerator contains a compressor and a refrigerant system that circulates refrigerant, which absorbs heat from the interior compartments. The absorbed heat is then released outside the refrigerator through the condenser coils located at the back or underneath the appliance. The warm air you feel blowing from the refrigerator is the result of the heat being expelled during this process.
In both cases, the warm air being blown out is a byproduct of the appliances' normal functioning and is essential for their proper operation. It's worth noting that while the warm air from an oven's exhaust is expected, the warm air from a refrigerator's exhaust can sometimes indicate a problem with the appliance, such as a malfunctioning compressor or improper airflow. If you notice any unusual or excessive heat coming from your refrigerator, it may be worth having it checked by a professional.