HVAC System and Air Ducts Quiz

What is the primary air delivered to the room from the supply duct called?

• Quaternary air

• Secondary air

• Tertiary air

• Primary air

What is the distance the air travels from the duct outlet before it slows to 50 fpm called?

• Throw

• Velocity

• Fixture capacity

• Outlet size

What happens if there is more return air than supply air in a room?

• The room will have a negative pressure

• The room will have no effect on pressure

• The room will have a positive pressure

• The room will have balanced pressure

During the heating season, where should return air duct inlets be located?

• At the door entrance

• In the middle of the room

• Near the floor

• Near the ceiling

What is the ideal number of return duct inlets in a room?

• One near the ceiling

• One near the floor

• Two near the floor

• Two near the ceiling

What is the percentage of oxygen in normal air?

• 27%

• 18%

• 21%

• 24%

What happens as the oxygen content in the air decreases and the carbon dioxide levels increase?

• The room feels warmer

• The room feels stuffy

• The room feels fresher

• The room feels cooler

What is the purpose of a heat recovery ventilator (HRV) or energy recovery ventilator (ERV)?

• To remove oxygen from the air

• To increase indoor temperature

• To decrease indoor temperature

• To transfer heat between incoming fresh air and outgoing exhaust air

What is the purpose of maintaining a positive pressure in a building?

• To reduce the efficiency of exhaust fans

• To bring in outside contaminants

• To keep out airborne dirt, dust, and pollen

• To decrease the efficiency of fuel-fired appliances

What is the purpose of a whole house fan in certain seasons?

• To increase indoor temperature

• To decrease indoor temperature

• To provide free cooling by blowing out hot air and drawing in cool air

• To circulate stale indoor air