The following conditions can result in transient CO situations:
1) Excessive spillage or reverse venting of fuel burning appliances
caused by:
i) Outdoor ambient conditions such as wind direction and/or velocity,
including high gusts of wind; heavy air in the vent pipes (cold/humid air
with extended periods between cycles).
ii) Negative pressure differential resulting from the use of exhaust fans.
iii) Simultaneous operation of several fuel burning appliances competing
for limited internal air.
iv) Vent pipe connection vibrating loose from clothes dryers, furnaces, or
water heaters.
v) Obstructions in or unconventional vent pipe designs which amplify the
above situations.
2) Extended operation of unvented fuel burning devices (range,
oven, fireplace, etc.).
3) Temperature inversions which can trap exhaust gasses near
the ground.
4) Car idling in an open or closed attached garage, or near a home.
SOURCES OF CARBON MONOXIDE
Fuel-burning appliances: portable heater, gas or wood burning
fireplace, gas kitchen range or cooktop, gas clothes dryer.
Damaged or insufficient venting: corroded or disconnected water
heater vent pipe, leaking chimney pipe or flue, or cracked heat
exchanger, blocked or clogged chimney opening.
Improper use of appliance/device: operating a barbecue grill or
vehicle in an enclosed area (like a garage or screened porch).
Transient CO Problems: "transient" or on-again-off-again CO
problems can be caused by outdoor conditions and other
special circumstances.
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