What's Included
Gas fireplace vents in Sanlando Springs, in detail
Air space between the vent and the framing
DuraVent's direct vent instructions open with a warning that a major cause of vent-related fires is failure to maintain required clearances, meaning air spaces, to combustible materials. Its Type B instructions require a 1 inch air space to combustibles around its round B-vent, regardless of pipe diameter.
Direct vent clearances vary by appliance and are set in its manual. Wherever the vent serving your Sanlando Springs fireplace can be reached, our team checks the space around it for wood, insulation or stored items that have crept too close, and explains what has to move.
The pitch of a horizontal vent run
Horizontal vent runs need the right pitch. DuraVent's direct vent instructions require a horizontal run to be level or rise 1/4 inch for every foot toward the termination, and never to run downward, because a downward slope can trap heat and become a possible fire hazard. Its Type B instructions ask lateral runs to slope upward away from the appliance by at least 1/4 inch per foot.
A run that has sagged since installation can lose that pitch. Our technicians check the slope along the accessible run serving your Sanlando Springs fireplace and add support or correct the pitch where it has dropped.
How high a B-vent must rise
Florida's fuel gas code (section 503.6.6) requires a Type B gas vent to terminate not less than 5 feet in vertical height above the highest connected draft hood or flue collar, and section 503.6.7 requires it to end with a listed cap or listed roof assembly. DuraVent adds that pipe from 3 to 12 inches in diameter must end at least 2 feet higher than an adjacent wall or obstruction within 8 feet.
Height and the cap both affect how the vent draws. Our team checks the B-vent above your Sanlando Springs roof against the roof pitch table in the vent instructions, the nearby walls and the code, and prices any extension or cap replacement it needs.
Condensate and corrosion in the vent
Continuous condensate can corrode vents, caps and draft hoods, the Type B instructions warn, and they call the situation extremely dangerous and in need of immediate correction. Named causes include incorrect vent sizing, long lateral runs, too many elbows and cold spaces, with laterals kept to no more than three quarters of the vertical height.
Beads of moisture on the outside of the pipe and rust at the joints are early signs. If our team finds them on the vent for your Sanlando Springs fireplace, we trace the cause, whether sizing, layout or an exposed section, before replacing the damaged parts.
