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Indoor Air Quality and Filtration Flashcards

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

Read the first 7 Indoor Air Quality and Filtration flashcards as text

  1. What does a MERV rating measure in air filters?

    Answer: Minimum Efficiency Reporting Value — particle capture efficiency

    MERV (Minimum Efficiency Reporting Value) rates a filter's ability to capture airborne particles on a scale of 1–16.

  2. Which IAQ pollutant is a naturally occurring radioactive gas that can accumulate in basements?

    Answer: Radon

    Radon is a colorless, odorless radioactive gas that seeps from soil and rock and can reach dangerous concentrations in poorly ventilated lower levels.

  3. What is the primary purpose of an energy recovery ventilator (ERV) compared to a heat recovery ventilator (HRV)?

    Answer: ERV transfers both heat and moisture; HRV transfers heat only

    An ERV transfers both sensible heat and moisture (latent energy) between exhaust and supply airstreams, while an HRV transfers heat only.

  4. A MERV 13 filter is generally recommended for which application?

    Answer: General residential use with standard HVAC equipment

    MERV 13 filters capture particles as small as 0.3–1.0 microns and are widely recommended for improved residential and light commercial IAQ.

  5. What condition results when a building's HVAC system creates a negative pressure differential relative to the outdoors?

    Answer: Backdrafting of combustion appliances

    Negative building pressure can cause combustion gases from furnaces or water heaters to be drawn back into the living space instead of exhausted outside.

  6. Which measurement unit is commonly used to quantify CO2 concentration when assessing ventilation adequacy?

    Answer: Parts per million (ppm)

    CO2 concentration in indoor air is measured in parts per million (ppm); levels above 1,000 ppm often indicate inadequate ventilation.

  7. What is the recommended action when an electronic air cleaner's collection cells become dirty?

    Answer: Wash the cells with water and mild detergent, then dry completely

    Electronic air cleaner collection cells should be removed and washed with water and mild detergent, then fully dried before reinstallation to restore efficiency.