The adjustments to convert net income to cash flow from operations generally. involve (1) adding the amount by which an expense exceeds the related cash expenditure for the period (for deprecia-. tion, the entire amount), (2) subtracting the amount by which a revenue exceeds the related cash receipt for the period.
Gas Furnaces: Cracked Heat Exchangers. The most common reason for a natural gas furnace to leak carbon monoxide is from a crack in the heat exchanger. The heat exchanger is the metal wall or tubing that is heated up when the burners are ignited.
A: Carbon Monoxide comes from many different sources: back drafting from furnaces, gas water heaters, wood stoves, fireplaces, gas stoves, unvented kerosene and gas space heaters, leaking chimneys and furnaces, automobile exhaust from attached garages, and tobacco smoke.