Repairman Checks Carbon Monoxide Level on Furnace Duct - Stock Image

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An service technician is using a carbon monoxide/gas oxygen content meter to test the air in a section of residential ductwork above a furnace. Focus is on the exhaust, the meter which reads CO 0 PPM, O2 20.7. Carbon Monoxide is a poisonous odorless gas, produced by improperly serviced or old appliances, which can cause death.

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