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How can you differentiate between a forced-air system and a natural-draft system?
By the type of fuel used
Based on the location of the thermostat
By the air flow direction
Whether the air passes naturally over the conditioning equipment
The correct answer is: Whether the air passes naturally over the conditioning equipment
A forced-air system uses a blower or fan to circulate air, while a natural-draft system relies on the natural movement of air. Therefore, the main difference between these two types of systems is whether the air flow is assisted or natural. Options A, B, and C do not provide an accurate distinction between the two types of systems. The type of fuel used may be the same for both systems, the location of the thermostat does not directly affect the type of system, and the air flow direction can vary depending on the specific setup of the system. Hence, the best way to differentiate between these two types of systems is by understanding if the air is being pushed by a fan or moving naturally through the system.