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Chimney Standard
Gas

Thermopile

A multi-junction sensor generating the millivolts that hold the gas valve open.

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All glossary terms

What is Thermopile?

Converts pilot-flame heat into a small voltage. Output declines with age, and below a threshold the valve closes despite a visibly lit pilot. Diagnosis is a millivolt measurement — which distinguishes replacing the correct component from replacing components in sequence.

Related terms:ThermocouplePilot Light

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Other terms in the glossary

Creosote
Condensed wood-smoke residue on the flue wall, graded by stage — and the stage is the finding that matters.
NFPA 211
The consensus standard governing chimneys, fireplaces, vents and solid-fuel appliances.
Inspection Levels
Three defined scopes — and the standard specifies when each is required, not which you prefer.
Flue
The passage carrying combustion products out — one appliance, one flue, correctly sized.
Liner
The barrier between combustion products and the building structure. A breach takes the flue out of service.
Crown
The sloped masonry cap on top of the chimney — the surface that fails first and costs most.
15+
Years in the field
NFPA 211
Checklist
48h
Written report
< 2hr
Response
Ready when you are

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Flat fee confirmed when you book. Same-week scheduling. A pass/fail verdict within 48 hours.

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Emergency

24/7 Response

Chimney fire, storm hit, active leak, or a flue you're not sure about? We answer 7 AM to midnight and the assessment ends in a written safe-to-use verdict — including a do-not-use notice when the evidence supports one. After-hours dispatch runs subject to crew availability.

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