Chapter H - Air Supply Systems

Question 1

Generally, what two systems are used to supply adequate combustion air?

Answer 1

Natural air flow, and forced air flow.

Question 2

Outside air can be brought to the gas appliance burners in what two ways? Which method is more common?

Answer 2

Ducts, or a hole in the wall. The duct method is more common.

Question 3

What is the purpose of having louvred grilles, caps, or screenings on air ducts?

Answer 3

To protect from rain, wind and debris from entering the system.

Question 4

Why do boiler rooms require ventilation openings to allow free circulation of air within the boiler room?

Answer 4

Build-ups of excessive heat, and flue gas spillage.

Question 5

What is never ducted below the level of the lowest draft control device?

Answer 5

Ventilation air openings are never ducted that low, and should be located as high as possible in a room.

Question 6

Air supply requirements are split up into what two categories?

Answer 6

Inputs up to and including 400,000 BTU’s (120 kW).

& Inputs over 400,000 BTU’s (120 kW).

Question 7

What key points must you know before you choose the table for air supply and venting requirements?

Answer 7

• Appliance type and location.
• Building construction.
• Appliance draft control.