HVAC Indoor Air Quality and Filtration 3

Question 1

Which ASHRAE standard provides minimum ventilation rates for acceptable indoor air quality in commercial buildings?

Accepted Answer

ASHRAE 62.1

Answer

ASHRAE Standard 62.1 establishes minimum outdoor air ventilation rates and IAQ requirements for commercial and institutional buildings.

Question 2

High relative humidity indoors (above 60%) most directly encourages which IAQ problem?

Accepted Answer

Mold and mildew growth

Answer

Relative humidity above 60% creates conditions that promote mold and mildew growth on surfaces and inside duct systems.

Question 3

What is the function of a bypass humidifier in an HVAC system?

Accepted Answer

It adds moisture to a portion of airflow diverted from the supply plenum across a water panel

Answer

A bypass humidifier diverts a portion of warm supply air through a moistened evaporator pad and returns it to the return plenum, adding humidity to the circulated air.

Question 4

Sick Building Syndrome (SBS) is most directly associated with which HVAC-related cause?

Accepted Answer

Inadequate ventilation and accumulation of indoor pollutants

Answer

SBS symptoms — headaches, fatigue, and irritation — are most commonly linked to poor ventilation that allows indoor pollutants to accumulate.

Question 5

Which type of UV light system is installed in the HVAC return air stream to reduce airborne biological contaminants?

Accepted Answer

In-duct UV-C air purifier

Answer

In-duct UV-C systems installed in the return airstream irradiate passing air to inactivate bacteria, viruses, and mold spores.

HVAC Practice Test

HVAC Practice Test

HVAC Indoor Air Quality and Filtration 3