Practice Test Geeks(HERS) Certified Home Energy Rating System Rater Practice Test
← All HERS Flashcard Decks

Diagnostic and Field Testing Flashcards

7 cards from real HERS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Diagnostic and Field Testing flashcards as text

  1. What pressure standard does RESNET use for normalizing envelope air leakage in a blower door test?

    Answer: 50 Pascals

    RESNET and most U.S. energy codes use 50 Pascals as the reference pressure for blower door testing and reporting air leakage (ACH50 or CFM50).

  2. A home tests at 1,850 CFM50 and has a volume of 12,000 cubic feet. What is the ACH50 value?

    Answer: 9.25 ACH50

    ACH50 = (CFM50 × 60) / volume = (1,850 × 60) / 12,000 = 111,000 / 12,000 = 9.25 ACH50.

  3. In HERS field testing, what does 'verified' mean in the context of duct leakage testing?

    Answer: A third-party certified rater performed and documented the measured test result on-site

    Verified testing means a certified HERS rater physically performed and documented the measurement on-site, as opposed to an assumed or estimated value.

  4. When a HERS rater tests a multi-story home, which factor must be carefully accounted for that is less critical in single-story testing?

    Answer: Stack effect influence on pressure readings

    Stack effect is amplified in taller homes due to the greater vertical distance, which can significantly affect pressure readings and blower door results, especially in cold weather.

  5. What is the correct procedure when wind speeds exceed acceptable limits during a blower door test?

    Answer: Postpone or reschedule the test until wind conditions are acceptable

    High winds create pressure fluctuations that compromise test accuracy; RESNET and ASTM standards recommend postponing testing when wind conditions exceed acceptable thresholds.

  6. A rater notices that the blower door reading fluctuates significantly during testing even at steady fan speed. The most likely cause is:

    Answer: High wind conditions causing pressure fluctuations

    Significant fluctuations in pressure readings during a steady blower door test are most commonly caused by gusty or high wind conditions creating variable external pressure.

  7. For HERS rating purposes, when must duct leakage testing be performed during construction?

    Answer: Before ducts are covered, sealed, or made inaccessible — rough-in stage or final

    Duct leakage testing must occur either at rough-in (before ducts are covered) or at final completion; RESNET allows either stage but the ducts must be accessible or testable.