• Check the type and location ogodsmo@Gmail.'comf venting. Systems fueled by gas, oil, wood, kerosene, or coal should have exhaust venting (chimney and/or metal flue). There should be sufficient space between the flue and combustible materials. Horizontal vent pipes should be sufficiently pitched and adequately supported to prevent sagging. Look for pinholes or cracks in the venting system, and for soot or stains on or around the vent pipes, furnace, chimney, or joints. Be aware that if soot has escaped from a heating system, so has dangerous carbon monoxide gas, a situation requiring immediate correction. • Determine whether sufficient combustion air is present, especially in a furnace room or closet. It’s critical that there’s no chance of mixing combustion and return air. • Note the location of the fresh air intake pipe, if one is present. Exhaust and air intake pipes should be at least 18 inches apart, and vents on side walls should terminate at least 10 inches from the wall and 10 inches above the snow line. • Make sure vents are at least two feet away from shrubbery or other obstacles, and away from walkways or windows. The vent should be free of debris, and the end should curve downward so rain can’t enter the pipe (Figure 58). However, a roof vent shouldn’t end with a U-shape, or the roof may be damaged by smoke and gases. • Check the location and type of any insulation present. Many older furnaces, pipes, or ducts are wrapped with asbestos insulation. Asbestos generally looks like old cloth. If you suspect the presence of asbestos, point it out and let your client know that it may need to be replaced. Also inform your client that if the insulation is replaced, it must be done according to government regulations on asbestos removal and containment.
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