Indoor Air Quality and Ventilation Standards Flashcards
7 cards from real ASHRAE 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 Ventilation Standards flashcards as text
In ASHRAE 52.2 MERV testing, which particle size range does E1 cover?
Answer: 0.3–1.0 μm
E1 is the smallest of the three ranges, 0.3–1.0 μm; E2 is 1.0–3.0 μm and E3 is 3.0–10.0 μm.
Since the 2016 edition, ASHRAE 62.1 requires what minimum filter rating upstream of cooling coils and other wetted surfaces?
Answer: MERV 8
62.1-2016 raised the minimum from MERV 6 to MERV 8 to protect coils and drain pans.
An indoor CO2 level about 700 ppm above outdoor concentration has traditionally corresponded to roughly what steady-state ventilation rate per sedentary adult?
Answer: 15 cfm/person
A differential of about 700 ppm corresponds to about 15 cfm/person, which made CO2 a common occupancy indicator.
Which ASHRAE standard, first published in 2023, sets requirements for controlling infectious aerosols using equivalent clean airflow?
Answer: Standard 241
Standard 241 sets equivalent clean airflow targets per person that can be met with outdoor air, filtration, or air cleaning.
What indoor radon concentration does the US EPA set as its action level for mitigation?
Answer: 4 pCi/L
The EPA recommends mitigation at or above 4 pCi/L.
Which is the most common indoor source of formaldehyde emissions?
Answer: Pressed wood products such as particleboard and MDF
Urea-formaldehyde resins in composite wood products off-gas formaldehyde, especially when new.
Upper-room and in-duct UVGI systems typically use low-pressure mercury lamps that emit UV-C at about what wavelength?
Answer: 254 nm
Low-pressure mercury lamps emit mostly at 253.7 nm, near the peak germicidal effectiveness for DNA/RNA.