What Is the Code-Compliant Way to Hook Up a Gas Dryer? (IRC 2018)

Quick Answer

Under IRC 2018 Section G2422.1, a gas dryer must be connected using a listed flexible gas appliance connector no longer than 6 feet, running from a rigid gas supply stub-out with an accessible shutoff valve in the same room. The connector must be listed for the gas type (natural gas or LP), must not pass through any wall or floor, and must not be kinked or under tension. The rigid supply must terminate in the laundry room, not through the wall from another space.

What G2422.1 Actually Requires

IRC 2018 Section G2422.1 establishes requirements for gas appliance connectors, which includes the flexible metallic tubing used to connect a gas dryer to the building gas supply. For clothes dryers (and ranges), the maximum connector length is 6 feet — longer than the 3-foot maximum for most other appliances, to allow for the movement needed to pull the dryer out for cleaning. The connector must be listed (UL 569 or equivalent) and must be sized for the gas inlet of the dryer — typically 1/2-inch diameter for residential dryers.

The supply stub-out must be in the laundry room, not in a crawl space or basement below the floor or in an adjacent utility room. Per G2422.1.2, the connector may not pass through any wall, floor, or partition. This means the rigid gas supply pipe must be extended to a proper in-room stub-out if it is not already located in the correct room. The stub-out must include an accessible shutoff valve per G2420.5 within 6 feet of the dryer location.

Connectors must not be reused when a dryer is replaced. The connector for the new dryer must be purchased separately — it is typically not included with the dryer. Appliance connectors are not transferable between appliances and should not be reused between dryers of different configurations because the previous installation may have resulted in kinking or corrosion at connection points that is not visible externally.

The dryer's exhaust duct — not a gas requirement but frequently confused with gas requirements — must vent to the exterior per IRC M1502. This is a separate requirement from the gas connection and uses a separate code section.

IRC 2018 Section G2422.1 requires that the flexible gas connector used for a dryer be listed under ANSI Z21.24. This standard specifies minimum pressure test requirements, material specifications (typically stainless steel corrugated tubing with brass end fittings), and maximum connector lengths. Gas dryer connectors are limited to a maximum length of 6 feet. Longer connectors are not permitted because increased connector length increases the risk of mechanical damage over time. Connectors that are too long are often coiled behind the appliance where they can be repeatedly kinked or crushed during normal use. The connector must be accessible for inspection and replacement and must not be embedded in the wall cavity or run through inaccessible spaces. Gas dryer connectors must be replaced every 10 to 15 years or immediately if any kinking, abrasion, or corrosion is observed during service. Homeowners should be advised to inspect the connector annually as part of the dryer lint trap cleaning routine.

Why This Rule Exists

A gas dryer uses 20,000 to 35,000 BTU/hr during operation. The flexible connector is the most vulnerable component in the dryer's gas supply system because it is subject to repeated flexing every time the dryer is pulled out for cleaning or servicing, and because it is located near lint accumulation in the laundry room. A leak at a kinked or corroded connector in a closed laundry room with the dryer running can rapidly accumulate enough gas to ignite. The length limit, no-wall-penetration rule, and listed-connector requirement together ensure the connector remains inspectable, replaceable, and adequate for its intended service life.

What the Inspector Checks at Rough and Final

At rough inspection, the inspector verifies that the gas supply stub-out and shutoff valve are correctly located in the laundry room within 6 feet of the dryer position. At final inspection, the inspector will check: the flexible connector is listed and within 6 feet in length, the connector is not kinked or under tension, the connector does not pass through the wall or floor, the shutoff valve is accessible with the dryer in its normal position, and the connector is new (not a reused connector from a previous dryer installation). The inspector may also check that the gas connection is made to the dryer inlet and not to a fitting that terminates inside the dryer's electrical or mechanical access area.

What Contractors Need to Know

Always supply a new connector for every dryer installation — include it in the job scope and price. Measure the distance from the stub-out to the dryer gas inlet with the dryer in its final position; ensure 6 feet is enough. For stacked washer-dryer installations, the dryer gas inlet may be difficult to access in the final installation position — confirm connector routing before finalizing the stub-out location. Use a straight-to-straight or 90-degree-to-straight connector configuration as needed, but avoid configurations that require the connector to double back on itself or form a loop — these create kink points.

Confirm the gas type (natural gas or LP) before purchasing the connector — connectors for natural gas and LP are different materials and have different pressure ratings. An LP connector used on natural gas may fail over time because LP-rated elastomers are not always compatible with natural gas odorant chemicals. Verify with the manufacturer if using an older connector of uncertain origin.

Gas dryers in new construction are typically supplied by a gas outlet box installed in the wall behind the dryer location. The outlet box includes a permanently installed manual shutoff valve and a threaded 0.5-inch outlet to which the flexible connector attaches. Install the outlet box at a height consistent with the dryer's gas connection height, typically 0 to 6 inches above the floor, and position it to allow the connector to make a straight connection without the connector needing to be bent or reversed to reach the dryer. Specify the outlet box location on the rough-in drawing so the gas pipe can be run correctly behind the wall before drywall is installed. Confirm that the dryer location is in a dedicated laundry space. Building code requires that gas dryers not be installed in sleeping rooms or bathrooms because of combustion air requirements and CO exposure concerns in occupied sleeping spaces.

What Homeowners Get Wrong

Many homeowners reuse the existing flexible connector when replacing a dryer. This is problematic because: the old connector may be kinked from the previous installation, it may be rated for a different gas type, it may already have micro-cracks from repeated flexing, and its original installation date (and remaining service life) is unknown. A new connector costs $15 to $30 — always replace it with a new one. Homeowners also sometimes use the dryer's installation video to guide the gas connection — these videos occasionally show connectors that are kinked or installed in ways that do not comply with G2422.1.2.

State and Local Amendments

IRC 2018 states — TX, GA, VA, NC, SC, TN, AL, MS, KY, and MO — follow G2422.1 without significant modification. Some utility companies in these states specify maximum connector ages (5 to 10 years) and require replacement during appliance service. The city of Los Angeles (not an IRC 2018 state, but worth noting for comparison) limits gas connectors for appliances to 18 inches for seismic reasons. No IRC 2018 states have shorter length limits than the 6-foot IRC maximum for dryers.

IRC 2021 did not change the connector requirements in G2422.1 for clothes dryers. The 6-foot maximum length and prohibition on wall and floor penetration carried forward unchanged.

When to Hire a Licensed Gas Plumber

Connecting a gas dryer to an existing stub-out with a new connector is within the skill of a competent homeowner in many states — it involves no new piping, only a connector change. However, if the stub-out needs to be relocated or if the shutoff valve needs to be installed or replaced, licensed gas contractor work and a permit are required. In some states and localities, all gas connections require a licensed contractor even for simple connector replacements. Confirm the local licensing requirement before proceeding.

Common Violations Found at Inspection

• Gas connector exceeding 6 feet — installer used a longer connector to avoid extending the rigid supply
• Connector routed through the wall from a supply in an adjacent room or crawl space
• Reused old connector with visible kinks, corrosion, or connection damage
• LP connector used on a natural gas system — wrong product for the gas type
• Shutoff valve not accessible with the dryer in its normal installed position
• Connector looped or coiled against itself to take up slack — creates kink points
• No shutoff valve on the dryer supply stub-out — required by G2420.5
• Connector installed with thread sealant on the appliance inlet connection — some dryer inlet fittings are already sealed at the factory and do not need additional sealant; verify with the dryer manufacturer's instructions