From where does warm air flow into the system that distributes air in a warming system?

In a warming system, the supply duct is the pathway through which warm air is delivered to the spaces that need heating. The function of the supply duct is to transport air that has been heated either by a furnace or another heating method, ensuring that the desired temperature is maintained throughout the building.

The air enters the supply duct after being heated and is then distributed into various areas, allowing for efficient temperature control. This system is vital for maintaining comfort in indoor environments, especially during colder months.

Other ducts mentioned serve different functions. For instance, return ducts carry cooler air back to the heating unit to be re-heated, while exhaust ducts remove stale air from the building. Fresh air ducts are used to bring in untreated outside air, which may be conditioned before entering the living spaces. Each duct has a distinct role, but it is the supply duct that specifically connects the heating source to the designated areas needing warmth.