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.
It will cost $85 to $125 to replace a bathroom exhaust fan. You will need to hire an electrician to wire the unit. If all he needs to do is replace the actual unit you it will be a minor project and take an hour or less. If he needs to perform minor construction for venting it will cost more.