Practice Test Geeks(CBD) Certified Bathroom Designer Practice Test
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Ventilation & Mechanical Systems Flashcards

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

    Answer: 50 CFM

    ASHRAE 62.2 specifies a minimum of 50 CFM for intermittent bathroom exhaust ventilation to adequately remove moisture and odors.

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

    Answer: HVI (Home Ventilating Institute)

    The Home Ventilating Institute (HVI) is the industry body that certifies exhaust fans for both airflow (CFM) and sound (sone) performance.

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

    Answer: Very quiet, comparable to a library

    A 1.0 sone rating is very quiet—equivalent to a quiet library—making it ideal for high-end bathroom installations where noise is a concern.

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

    Answer: 6 feet

    Most codes and manufacturer guidelines limit flexible duct connectors to 6 feet to minimize airflow restriction and moisture accumulation.

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

    Answer: Humidity-sensing switch

    A humidity-sensing switch automatically activates the fan when relative humidity rises above a set point, directly addressing the source of moisture buildup.

  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?

    Answer: 1.0 CFM/sq ft

    HVI recommends 1 CFM per square foot of bathroom floor area for standard 8-foot ceilings as a quick sizing method.

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

    Answer: Create moisture damage and potential mold growth in the attic

    Discharging warm, humid bathroom air into an attic causes condensation on framing and insulation, leading to moisture damage and mold growth.

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