Gas fireplace venting done by the manual in Millenia

Flex pipe secured at both ends

Flexible vent pipe is only as good as its connections. One maker wants the flex to overlap the fireplace and termination collars by at least 1 inch, or 1 inch past an internal bead, and to be held with a hose clamp.

The same manual asks the installer to tug the pipe to prove it will not slip off, and to repeat the process on both the inner and the outer pipe. Our technicians check each clamp they can reach and redo any connection that pulls loose.

• Overlap of at least 1 inch on each collar
• A hose clamp on every flex connection
• A pull test on inner and outer pipe

Distance from windows and doors that open

How close a direct-vent cap may sit to a window or door that opens depends on the fireplace's input, which is printed on the rating plate. Under the Florida fuel gas code table, a unit rated at up to 10,000 Btu per hour needs 6 inches, one rated between that and 50,000 needs 9 inches, and anything larger needs 12 inches.

Our pros read that plate before measuring. A manual can ask for more than the code, and when the two differ we use the larger number and say so in the estimate.

Local rules can ask for more than the manual

Manufacturers write their clearance charts to the national gas codes and then add that local codes may require different clearances. In Florida the fuel gas code sets its own table, and the stricter of the code and the manual governs.

Whether a permit applies depends on the work and the jurisdiction. When a job changes the vent route in Millenia, we confirm the requirements for your address before the work is scheduled and show any permit step on the estimate.

Exhaust fans that compete with a B-vent fireplace

Kitchen hoods, bath fans and other exhaust equipment move air out of a house, and something has to replace it. When they run, a natural-vent fireplace can end up competing with them for air.

One B-vent fireplace manual lists negative air pressure as a cause of poor draft and describes a simple test, opening a window in the fireplace room to see whether the unit starts drafting correctly. Our technicians run that test and explain what the result means for your home.

A natural-vent fireplace that shuts down early

When a B-vent unit runs for a while and then shuts itself off, one maker's troubleshooting table points to a blockage or restriction in the venting. The fix it gives is to remove the blockage and relight the pilot following the lighting instructions.

Finding that blockage is the real work. Our crew checks the cap, the reachable pipe and any enclosure around the top, and if nothing turns up there, the draft checks and the controls come next.