Gas fireplace venting for direct vent and B-vent units in Lake Dot

Sidewalks and driveways under the cap

People walk and park under sidewall caps more often than owners realize. One maker asks for 7 feet of clearance above a paved sidewalk or driveway on public property, and it rules out a cap directly above a paved sidewalk or driveway that sits between two single-family homes and serves both.

Our crew checks what sits below and in front of your cap, including side yards between houses, and writes down any location the chart does not allow.

Supports that keep weight off the elbows

Vent pipe should hang from its supports and never from its joints. One B-vent fireplace manual wants a hanger on horizontal runs at least every 5 feet, and offsets held up in a way that keeps the pipe's weight off the elbows.

Sagging pipe pulls joints apart and ruins the upward slope the draft depends on. When our crew finds a missing hanger or a bent strap, it goes into the estimate along with the section of pipe it supports.

Re-siding the wall around a vent

New siding changes the surface a sidewall cap mounts to, and often its thickness. One maker says terminals must not be recessed into a wall or siding, and its alcove figures ask for more room next to vinyl than next to other sidewall materials.

Our technicians check the cap's position against the finished wall after re-siding, confirm the seal around the pipe and list any wall extension parts your manual allows. Siding work itself stays with the siding contractor.

Natural gas or propane on the rating plate

Every gas fireplace is built for the gas named on its rating plate. One direct-vent manual says its unit is not convertible to another gas unless the maker's approved conversion kit is used.

A fireplace running on the wrong gas behaves badly no matter how good the vent is. Our pros confirm the gas type on the plate against the supply before any vent diagnosis, since that check takes a minute and rules out a costly wrong turn.

What the written venting estimate lists

Our estimate breaks the vent job into the pieces you would want to see. Parts come by name, access openings and finish repairs sit on their own lines, and anything we could not reach is stated plainly.

Your approved price holds unless you sign off on added work. Nothing is hidden, and booking within 72 hours after the inspection puts 10% off on that same page.

• Listed vent parts for your model
• Wall, ceiling or roof access
• Finish repairs after access
• Test burn and leak check