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

CFM (cubic feet per minute) is the standard unit for measuring volumetric airflow in HVAC duct systems and ventilation equipment.

Question 2

What is static pressure in an HVAC duct system?

Accepted Answer

The resistance to airflow within the duct system

Answer

Static pressure is the resistance to airflow caused by friction and fittings in the duct system, measured in inches of water column (in. WC).

Question 3

What does ASHRAE Standard 62.2 specify?

Accepted Answer

Ventilation requirements for acceptable indoor air quality in residential buildings

Answer

ASHRAE 62.2 sets the minimum ventilation rates and indoor air quality requirements for residential buildings in the United States.

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

Manual balancing dampers allow technicians to restrict airflow to over-supplied zones and redirect it to under-supplied zones to achieve proper air distribution balance.

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

A balanced ventilation system uses equal supply and exhaust airflow to maintain neutral building pressure, which is the design goal for most commercial HVAC systems.

HVAC - Heating, Ventilation, and Air Conditioning Practice Test

HVAC - Heating, Ventilation, and Air Conditioning Practice Test

HVAC Ventilation and Air Distribution