Quiz: Dedicated Outdoor Air System

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This quiz refers to two articles, “Dividing to Conquer: DOAS saves energy, increases IAQ” and “Using data loggers to verify DOAS Energy Recovery Efficiency” in the Summer/Fall 2018 issue of the BOC Bulletin. To earn one maintenance point towards your annual BOC credential maintenance, read the articles and then take this short quiz based on the material.

Your quiz results will be emailed to you. If you pass, simply save the email for your records and enter it on your maintenance application to receive credit. If you do not pass, we encourage you to reread the article and retake this quiz.

1) In effect, what is DOAS?*
- A. A system that wastes money
- B. Dedicated Outdoor Air System that decouples ventilation from HVAC systems
- C. A system that changes Indoor Air Quality
- D. Fans that run only when heat is called for
2) HRV stands for*
- A. Home Recovery Ventilation
- B. Heat Related Ventilation
- C. Heat Recovery Ventilation
- D. Heart Rate Ventilation
3) DOAS installations are more common today because*
- A. IECC and ASHRE 90.1 added fan efficiency to codes
- B. Occupant complaints of excess humidity
- C. Manufacturers want to sell more equipment
- D. Occupant complaints about drafts
4. What might be considered a drawback of a DOAS?*
- A. Too complicated to install
- B. Only can be installed in new construction
- C. Separate ductwork can increase first time cost
- D. Polluted air can be brought into a building
5) DOAS units are most effective when used in*
- A. Cold climates
- B. Warm climates
- C. Dusty climates
- D. Depends on the climate, lifestyle of occupants and building design
6) ERV is*
- A. A wheel that extracts moisture
- B. A fan that saves energy
- C. A paper filter
- D. An enthalpy recovery system
7) Heat Recovery Ventilation systems are most effective in cold climates because*
- A. It moves air faster than a regular ventilator
- B. It removes moisture from the incoming air
- C. It removes moisture from the indoor air
- D. it keeps the relative humidity the same indoors and out
8) Savings from DOAS units can be*
- A. Up to 5%
- B. Up to 15%
- C. 14%-27%
- D. 14%-48%
9) The difference between HRV and an ERV is*
- A. HRV brings in only fresh air
- B. ERV sends dirty air out
- C. HRV filters are paper
- D. HRV transfers heat, ERV's transfer heat and moisture
10) The energy savings derived from the installation of a DOAS system come from*
- A. Using preheated air from outside to save on heating costs
- B. Lowering fan speeds in the HVAC system
- C. De-coupling the ventilation demand from the HVAC system so that it is not required to run just to supply adequate fresh air
- D. Lowering the set point temperature of the AC unit
Bonus Question
BONUS Question: What topics would you be interested in reading about in future issues of the BOC Bulletin?
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