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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 Vent-free gas fireplace (no chimney required) with installation: The standard cost for a vent-free, or ventless, gas fireplace is approximately $800-$2,000 installed. This does not include the cost of any gas-line work needed.  Installation costs for a top-vented gas fireplace: Approximately $300 to $1,200.