Indoor Air Quality :: THE CASE OF THE CO LEAK: Solving the Mysteries of Carbon Monoxide Exposures

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Thoroughly check gas appliances for proper combustion and integrity using visual inspection (don't ignore signs of problems like soot, rusting, burned wires, or yellow flames), pressure tests (use a manometer to check manifold pressure), flow tests (clock the meter), heat exchanger testing, combustion tests (check combustion products for CO), and all tests recommended by appliance manufacturers. Thoroughly inspect the venting system. Look for blockage, rust, evidence of spillage and improper design and installation. Perform a worst-case downdrafting test by closing all windows to the house; operating all exhaust fans; building a fire in the fireplace or woodstove; and then testing for proper draft. Check for adequate combustion and makeup air. Ensure that the basements or rooms with combustion appliances have adequate combustion air. Correct any problems you find. In tight...

Full article: http://www.homeenergy.org/show/article/id/1346