Confirm UL 103 listing status for a factory-built (prefabricated metal) residential chimney system via UL Product iQ before an install or code-compliance inspection.
domain: productiq.ulprospector.com · 4 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Search productiq.ulprospector.com by manufacturer/model or UL file number for the factory-built chimney system
Confirm the listing category matches UL 103 (factory-built chimneys), separate from UL 1777 (field-installed masonry liners)
Cross-reference the listed clearance-to-combustibles and termination-height specs against the manufacturer's printed installation instructions, since IRC/IMC require installation per the listing
Note any UL 103HT ("high-temperature") sub-designation if the appliance is a solid-fuel unit requiring the higher rating
Known gotchas
UL 103 and UL 103HT carry different temperature ratings — confirm which one applies to a solid-fuel vs gas application before approving an install
Product iQ listings can lag a manufacturer's own spec-sheet updates; when the two conflict, treat the UL listing record as authoritative for code compliance and flag the discrepancy
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