CBD Ventilation & Mechanical Systems

Question 1

According to ASHRAE 62.2, what is the minimum recommended intermittent exhaust rate for a residential bathroom?

Accepted Answer

50 CFM

Answer

20 CFM

Answer

75 CFM

Answer

100 CFM

Question 2

Which organization certifies and rates residential exhaust fans for airflow performance and sound levels?

Accepted Answer

HVI (Home Ventilating Institute)

Answer

ANSI

Answer

ASHRAE

Answer

NKBA

Question 3

A bathroom exhaust fan rated at 1.0 sone is best described as:

Accepted Answer

Very quiet, comparable to a library

Answer

Extremely loud, like a vacuum cleaner

Answer

Equivalent to normal conversation

Answer

Moderate, like background office noise

Question 4

What is the maximum recommended length of flexible exhaust duct allowed when connecting a bathroom exhaust fan to rigid ductwork?

Accepted Answer

6 feet

Answer

2 feet

Answer

4 feet

Answer

10 feet

Question 5

Which exhaust fan control provides the most effective moisture management in a bathroom by responding directly to humidity levels?

Accepted Answer

Humidity-sensing switch

Answer

Manual wall switch

Answer

Timer switch

Answer

Occupancy sensor

Question 6

When sizing an exhaust fan for a bathroom using the HVI rule-of-thumb method, what CFM per square foot is recommended for rooms with 8-foot ceilings?

Accepted Answer

1.0 CFM/sq ft

Answer

0.5 CFM/sq ft

Answer

1.5 CFM/sq ft

Answer

2.0 CFM/sq ft

Question 7

Bathroom exhaust fans must always terminate to the exterior of the building because discharging into an attic will:

Accepted Answer

Create moisture damage and potential mold growth in the attic

Answer

Cause the fan motor to overheat

Answer

Violate electrical code requirements

Answer

Reduce the fan's CFM rating