TL;DR
An appliance sediment trap is the short, capped dead-leg of pipe teed into the gas line just before a furnace, water heater, or range connection, positioned so falling debris, scale, and moisture drop into it instead of riding the gas flow into the appliance valve. The fuel gas code (IFGC 408.4) requires one at most appliances, with the trap leg at least 3 inches long and the gas taking a 90-degree turn above it.
What it means
An appliance sediment trap is the short, capped dead-leg of pipe teed into the gas line just before a furnace, water heater, or range connection, positioned so falling debris, scale, and moisture drop into it instead of riding the gas flow into the appliance valve. The fuel gas code (IFGC 408.4) requires one at most appliances, with the trap leg at least 3 inches long and the gas taking a 90-degree turn above it. It protects the gas valve and burner orifices, whose tiny ports clog easily. Inspectors fail water heater swaps over a missing one more than almost any other gas-piping detail.
Where it sits in the glossary
Appliance sediment trap is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
License: CC-BY-4.0 — quote freely with attribution to ProFix Editorial Team / ProFix Directory.