When this method is used, a fixed asset is depreciated by the same amount each year. When using the straight-line method, you must specify one of the following options in the FA depreciation book: 1  The depreciation period (years or months) or a depreciation ending date.
Assuming the house has wood siding and there's an electrical line already in the bathroom, an electrician will charge $268 to install an exhaust fan, which includes the labor and material. You can buy the fan for $90 and install it, saving 66 percent. DIY Hassle Alert.
You can buy a bathroom exhaust fan for $25 to $60. This will buy you a ceiling fan with about 100 CFM. This Broan 671 Ceiling and Wall Mount Ventilation Fan will adequately ventilate a bathroom.