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How long can a dryer vent be? Length, elbows and materials for Kitchener homes
A dryer can only push air so far. The maximum length of the vent is set by the dryer's manufacturer, every turn uses some of it up, and a lot of Kitchener basement runs were built longer than the limit.
Last updated September 25, 2026 · Reviewed by the Kitchener Dryer Vent Cleaning team
The limit is in your dryer's manual
There is no single number for every dryer. Manufacturers test their machines and publish a table of the longest vent run they allow, which depends on the duct diameter, the number of elbows and sometimes the type of exterior hood. GE Appliances tells owners to see the model's installation instructions for duct length recommendations. That table is the number to go by, because it is what the machine was designed and tested for.
To give a sense of scale, LG's published venting guidance for 4-inch rigid metal duct allows up to 65 feet with no elbows, falling to 55 feet with one 90-degree elbow, 47 feet with two, 36 feet with three and 28 feet with four. LG allows a maximum of four 90-degree elbows. Other brands publish different figures, some much shorter, so check your own model.
Why elbows count so heavily
Every 90-degree turn adds resistance, and it is also where lint tends to drop out of the airstream and collect. A run that is 25 feet long with four elbows can be closer to its limit than a straight 40-foot run. When you measure a vent, count:
- The transition duct behind the dryer and any bend it makes.
- Every elbow in the run, including the ones hidden above a finished ceiling.
- The turn through the wall to the exterior hood.
LG also notes that the duct should run straight or in a gentle S curve, and should not be kinked, crushed or dented.
What materials manufacturers allow
Manufacturer guidance lines up closely on this:
- 4-inch round duct. GE requires 4-inch round duct and notes that larger ducts slow the air, which lets lint settle.
- Rigid metal is preferred for the run itself. GE and LG both point owners to rigid metal.
- Flexible metal only in short lengths. GE allows semi-rigid metal duct only where the length is 8 feet or less, which in practice means the connection behind the dryer.
- No plastic. GE states that plastic duct is no longer approved, and LG says to avoid plastic or vinyl ducting.
- No screens in the duct. GE says screens cannot be installed in exhaust ducts, because they catch lint.
The City of Toronto's fire safety guidance adds why this matters: plastic and foil ducts are more prone to kinking, sagging and crushing, which leads to lint buildup.
Where a dryer must never vent
GE lists places a dryer exhaust must not go: a chimney, a crawl space, an attic, a common duct shared with kitchen exhaust, a closet without outside venting, or into a bedroom or bathroom. Gas dryers must never be vented indoors. In Kitchener's century homes downtown and around Victoria Park, venting into an old chimney chase or out through a window well was a common shortcut, and both are problems.
Common problems in Kitchener runs
- Long basement runs in 1960s to 80s houses. In Stanley Park, Forest Heights and Rosemount the laundry is often on the opposite side of the basement from the hood, with 20 to 35 feet of duct and several elbows between them.
- Original foil or plastic flex hidden above a finished ceiling, sagging between joists and holding lint in every dip.
- Screws through the duct. Screws that poke into the airstream catch lint. Whirlpool's installation instructions say not to join the vent with screws that extend into the duct, and not to use duct tape.
- Crushed transition ducts behind a dryer pushed tight to the wall.
- Vertical runs in stacked townhouses and condos in Doon and downtown, going up through a chase to a roof cap.
The outside end of the run
The hood matters as much as the duct. Whirlpool's installation instructions call for the exhaust hood to be at least 12 inches from the ground or any object that could obstruct the exhaust. In practice that rules out hoods buried behind a deck skirt, hidden under a shrub, or sitting at the bottom of a window well where snow collects in January. A hood with a stuck or missing damper lets cold air, insects and birds into the duct, and a hood with a fine screen over it traps lint at the one point where it should be leaving the house.
What to do if your run is too long
- Measure it and count the elbows, then compare against the table in your dryer's installation instructions.
- Shorten or straighten it. Replacing two 90-degree elbows with gentler bends, or moving the hood to a closer wall, can bring a run back within the limit.
- Replace foil and plastic with rigid metal along the accessible length.
- Keep it clean. A run close to the limit has less margin for lint, so it needs cleaning more often.
Rerouting a vent to a new exterior hood, including coring through brick or block, is covered under dryer vent repair and rerouting, and condo and townhouse runs under condo and townhouse dryer vents. For planning ranges, see the Kitchener dryer vent cleaning cost guide, and request a written quote from the contact page.