Skip to content
WorkZen
Academy
Home
All Trades
My Progress
en
English
EN
Français
FR
Español
ES
Menu
Home
All Trades
My Progress
Search certifications...
en
English
EN
Français
FR
Español
ES
Academy
HVAC
NCI Carbon Monoxide & Combustion Safety
CO Detection and Measurement
Knowledge Check
CO Detection and Measurement
Knowledge Check
Knowledge Check
1 / 15
A UL 2034-listed consumer CO alarm is installed in a home. At what minimum CO concentration is the alarm designed to begin responding?
A
9 ppm - it responds to all CO above outdoor ambient
B
200 ppm - it only alarms at the NIOSH ceiling
C
70 ppm - UL 2034 requires no response below this level
D
35 ppm - it alarms at the NIOSH REL
Check Answer
Back to lessons
Next module: Combustion analysis
Next module: