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.
1 Never run your car in the garage without adequate ventilation. 2  Leave the garage door wide open. 3  Furnaces are often the cause of a carbon monoxide leak. 4  As they burn fuel to produce heat, they exhaust CO.