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How to Install a Gas Fireplace-Fireplace Framing
Fireplace Framing
Build a Mock-Up to Find the Best
Position
Your new fireplace will have a major impact on your room.
Build a simple mock-up to get a feel for the amount of space it takes up and to
see how the angled placement will affect furniture arrangement and traffic
patterns.
When you’re satisfied with the aesthetics of the fireplace, turn your attention to the mechanical requirements. You’ll need to run a gas supply line for the fireplace. Call in a plumber to plan the route before you order the fireplace.
Most gas fireplaces don’t require electricity to operate. However, if you ever decide to add a blower to increase heat output or a hand-held remote control, you’ll have to connect the fireplace to an available electrical circuit, so run a wire to the fireplace while it’s accessible. In addition, since electrical codes don’t allow you to simply cover a box that contains live wires, you’ll have to disconnect or relocate any boxes or receptacles that will be covered by the new fireplace.
Finally, determine how you’ll get the vent from the fireplace to the outdoors. Thanks to the ingenious two-layer design that keeps the outside of the pipe relatively cool, the vents from direct-vent fireplaces can run straight out through the wall or up through the roof, allowing great flexibility in design and placement of the fireplace. Even so, there are very specific requirements that your fireplace and vent installation must meet. Check the installation manual to make sure. Here are a few key points to look for:
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Clearances from the fireplace box to surrounding walls and to the wood framing. Ours required 1/2 in. on the sides and back and 3-1/2 in. on top.
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Distance the vent must be kept from insulation, wood and other combustibles. Sometimes metal shields must be used over the top of the vent to divert the heat.
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Maximum number of bends in the vent pipes and the relationship of horizontal to vertical lengths of pipes. Our manual had many illustrations with dimensions to help with the venting layout. You can ask the dealer for help with vent design.
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Distance the vent cap must be kept from windows, doors, corners and other elements at the point where it leaves the house. Measure where the vent pipe will come out and make sure it meets the specifications.
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And before you begin, contact the local building inspections department to obtain the permits required for a fireplace installation.
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