The best contractor to hire for this purpose is an electrical contractor. Find out all the electrical contractors that are certified and licensed in your area. The Better Business Bureau is a great resource.

Interview each electrical contractor on the list. Describe the location in which you want to install the ventilation fan to find out if a ventilation fan can be installed at that location and if the contractor is experienced in that type of installation.

Ask each contractor for references concerning similar work they have done. Call each reference and ask each questions about the type of work done. Before a final selection is made, ask each one to come and survey the location, estimate the cost and what steps they will take to install the fan.

Be frank about your budget limitations. Be sure the contractor is willing to complete all the work required within your budget. Also, before hiring the contractor, ask for details of the insurance carried by each one.

Get written bids from each contractor. These bids should be specific and detailed. Obtain a signed work order or contract before the work is started.