HVAC Ventilation and Air Distribution

Question 1

What unit is used to measure airflow volume in HVAC duct systems?

Accepted Answer

CFM (cubic feet per minute)

Answer

PSI (pounds per square inch)

Answer

FPM (feet per minute)

Answer

BTU/hr (British Thermal Units per hour)

Question 2

What is static pressure in an HVAC duct system?

Accepted Answer

The resistance to airflow within the duct system

Answer

The velocity pressure of moving air

Answer

The pressure difference between supply and return ducts

Answer

The fan speed setting

Question 3

What does ASHRAE Standard 62.2 specify?

Accepted Answer

Ventilation requirements for acceptable indoor air quality in residential buildings

Answer

Duct leakage testing requirements

Answer

Energy efficiency ratings for HVAC equipment

Answer

Refrigerant handling and recovery procedures

Question 4

What is the purpose of a manual balancing damper in an air distribution system?

Accepted Answer

To manually adjust airflow to individual zones or branches to achieve proper balance

Answer

To automatically adjust airflow based on thermostat demand

Answer

To prevent backdraft from outdoor air

Answer

To control the speed of the supply fan

Question 5

What type of ventilation system uses both a supply fan and an exhaust fan to control building pressure?

Accepted Answer

Balanced ventilation

Answer

Natural ventilation

Answer

Exhaust-only ventilation

Answer

Supply-only ventilation

Question 6

What device is used to recover heat from exhaust air and transfer it to incoming fresh air in an energy recovery system?

Accepted Answer

Heat Recovery Ventilator (HRV) or Energy Recovery Ventilator (ERV)

Answer

Economizer

Answer

Variable Air Volume (VAV) box

Answer

Fan-powered mixing box