HERS Ventilation & Indoor Air Quality

Question 1

Which ASHRAE standard governs minimum mechanical ventilation requirements for residential buildings rated under the HERS program?

Accepted Answer

ASHRAE 62.2

Answer

ASHRAE 62.1

Answer

ASHRAE 90.1

Answer

ASHRAE 55

Question 2

Using the ASHRAE 62.2 formula, what is the minimum required whole-building mechanical ventilation rate for a 1,500 sq ft home with 3 bedrooms?

Accepted Answer

45 CFM

Answer

30 CFM

Answer

60 CFM

Answer

75 CFM

Question 3

In a tight home with a blower door result at or below 3 ACH50, ASHRAE 62.2 requires mechanical ventilation primarily to:

Accepted Answer

Dilute indoor pollutants and maintain acceptable indoor air quality

Answer

Reduce peak cooling loads

Answer

Pressurize the building envelope against moisture drive

Answer

Satisfy fire code egress requirements

Question 4

Per ASHRAE 62.2, the measured airflow of a mechanical ventilation system must be within what tolerance of the design rate to be considered compliant?

Accepted Answer

±10%

Answer

±5%

Answer

±15%

Answer

±25%

Question 5

Which of the following ventilation system types provides the greatest control over both supply and exhaust airflow rates in a residence?

Accepted Answer

Balanced ventilation

Answer

Exhaust-only ventilation

Answer

Supply-only ventilation

Answer

Natural ventilation through operable windows

Question 6

Under ASHRAE 62.2, which type of local ventilation is required in addition to whole-building mechanical ventilation?

Accepted Answer

Spot ventilation for kitchens and bathrooms

Answer

Whole-house dehumidifier

Answer

Central air filtration with MERV-8 filter

Answer

Passive stack ventilation in the attic

Question 7

Per ASHRAE 62.2, kitchen exhaust fans with airflow ratings at or below 400 CFM must have a maximum sound rating of:

Accepted Answer

3 sones

Answer

1 sone

Answer

2 sones

Answer

5 sones