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To install a 50-foot long ridge vent, a roofing contractor will charge $409, which includes the labor and material. If you're a handy homeowner who has experience working on roofing projects, you can buy the ridge vent material for $125 and install it yourself, saving 69 percent, a nice reward for your work.
1 A gas fireplace that needs ventilation will cost upwards of $350 to $800. 2  This price does not include the installation itself. 3  A fireplace that does not require ventilation, it can cost $500 to $2,500. 4  A direct vent fireplace that vents through a hole in a wall can cost $1,400 to $4,000 not including labor. The price varies based on the design and the energy output of the fireplace itself. 2  For example, a Lennox 42 inch stainless gas fireplace is big and powerful enough to provide enough heat in a house. 3  These are priced from $2,400 to $3,700.