ASHRAE Technical Specifications 4 — Questions and Answers
Question 1: Under ASHRAE 62.1, what is the zone air distribution effectiveness (Ez) for ceiling supply of cool air with ceiling return?
- 1.0 (Correct answer)
- 0.8
- 1.2
- 0.5
Correct answer: 1.0
Table 6.2.2.2 assigns Ez = 1.0 to ceiling supply of cool air with ceiling return.
Question 2: Which ASHRAE 90.1 compliance path uses Appendix G to compare a proposed design against a baseline building?
- Simplified Approach Option
- Performance Rating Method (Correct answer)
- Mandatory provisions only
- Prescriptive path
Correct answer: Performance Rating Method
Appendix G's Performance Rating Method is also used for LEED energy credits and code compliance in recent editions.
Question 3: ASHRAE 52.2 groups test particles into ranges. Which size range is E1?
- 1.0 to 3.0 µm
- 10 to 30 µm
- 3.0 to 10.0 µm
- 0.3 to 1.0 µm (Correct answer)
Correct answer: 0.3 to 1.0 µm
E1 covers the smallest particles, 0.3 to 1.0 µm; E2 covers 1.0 to 3.0 µm and E3 covers 3.0 to 10.0 µm.
Question 4: In ASHRAE Standard 55, operative temperature in a space with low air speed is roughly equal to what?
- The wet-bulb temperature
- The dew-point temperature
- The average of air temperature and mean radiant temperature (Correct answer)
- The supply air temperature
Correct answer: The average of air temperature and mean radiant temperature
At low air speeds, operative temperature is about the mean of the dry-bulb air temperature and the mean radiant temperature.
Question 5: ASHRAE 90.1 climate zone assignments are defined in which ASHRAE standard?
- Standard 140
- Standard 62.1
- Standard 55
- Standard 169 (Correct answer)
Correct answer: Standard 169
ASHRAE 169 provides the climatic data and climate zone definitions that 90.1 references.
Question 6: R-32, a common replacement for R-410A, has which ASHRAE Standard 34 safety classification?
- A2L (Correct answer)
- A1
- B2L
- A3
Correct answer: A2L
R-32 has lower toxicity and is mildly flammable, so it is classified A2L.
Question 7: ASHRAE 90.1 (2016/2019) requires demand-controlled ventilation in spaces over 500 ft² with a design occupancy of at least how many people per 1,000 ft²?
- 25 (Correct answer)
- 50
- 5
- 10
Correct answer: 25
DCV is required where design occupancy is 25 or more people per 1,000 ft², subject to listed exceptions.
ASHRAE Technical Specifications 4
Under ASHRAE 62.1, what is the zone air distribution effectiveness (Ez) for ceiling supply of cool air with ceiling return?