15. what type of draft is used to move flue gas through the heat exchanger and into the modern gas - fired…
15. what type of draft is used to move flue gas through the heat exchanger and into the modern gas - fired furnaces? a. atmospheric b. mechanical c. natural d. neutral
Answer
Brief Explanations:
In modern gas - fired furnaces, mechanical draft is commonly used to move flue gas through the heat exchanger and into the vent. Mechanical draft systems use fans or blowers to create the necessary pressure difference for flue - gas movement, providing more reliable and controllable operation compared to natural draft which depends on natural buoyancy forces. Atmospheric and neutral are not typical draft types for this function in modern gas - fired furnaces.
Answer:
B. Mechanical