Long Dryer Vent Runs in Townhomes and Condos

In a single-story house, the dryer usually sits against an outside wall and vents a few feet straight through it. Townhomes and condos rarely work that way. The laundry closet may be in the middle of the second floor, and the vent has to travel through walls, between floors, and up to the roof or across to a side wall before it reaches outside.

That longer path is one of the most common reasons dryers in multi-level homes around Everett start taking two cycles to dry a load. Here's why it happens and what to do about it.

Why long runs clog faster

A dryer pushes warm, moist air and fine lint out through the vent. The farther that air has to travel, the more it slows down and cools off. Lint drops out of the airstream sooner, especially at the turns.

Three features make townhome and condo vents more prone to buildup:

Length. Every foot adds resistance. Dryer manufacturers set limits on how long a vent can be, and those limits shrink with each elbow. Check your dryer's installation manual for the exact figures.

Elbows. Every bend is a place where lint collects. A vent that turns up through a wall, across a ceiling and out a side wall can have several.

Vertical sections. When a vent goes up to the roof, lint has to be carried upward. When the dryer stops, some of it falls back and settles near the bottom of the run.

Roof exits vs. side-wall exits

Both are common in our area, and both have trade-offs.

Roof terminations

Roof caps keep the vent away from walkways and landscaping, but they're hard to inspect. Many roof caps have screens or narrow openings that catch lint, and a blocked cap can go unnoticed for a long time because nobody looks at it. Needles and leaves from nearby trees can add to the problem, and our wet weather helps lint stick to the cap.

Side-wall terminations

Side-wall caps are easier to see, but on upper floors they may still be out of reach without a ladder. The flap can stick open or shut, and lint often gathers on the siding below.

Signs your vent is struggling

The U.S. Fire Administration lists several signs that a dryer vent needs attention, and they apply to every home:

• Clothes take longer than normal to dry, or need a second cycle
• The outside of the dryer gets very hot
• The laundry room feels warm and humid during a load
• There's a burning smell
• The outside vent flap doesn't open when the dryer is running

In a townhome, add one more: little or no air coming out at the termination point, even though the dryer is running on heat.

What you can do, and what to leave alone

Some maintenance is easy and safe for anyone:

• Clean the lint screen before or after every load. USFA recommends this for all dryers.
• Check the connection behind the dryer. The short transition duct is easily crushed when the dryer is pushed back against the wall. A kinked hose can choke airflow on its own.
• Use metal venting. USFA advises rigid or flexible metal venting, not plastic or foil accordion-style ducts.

What's harder to do yourself is cleaning the hidden part of the run, between the wall behind the dryer and the cap on the roof or side wall. Brush kits from the hardware store are built for short, straight runs. On a long vent with several bends, a brush can push lint into a tighter clog or get stuck. And unless you're comfortable on a roof, the cap end is best left to someone with the right equipment.

HOA and building rules

If you live in a condo or a townhome community, check before you schedule anything. Some associations handle roof access, require that contractors coordinate with the property manager, or schedule dryer vent cleaning for a whole building. Others leave it to each owner. It's worth asking who is responsible for the part of the vent that runs through shared walls or the roof.

How we clean long runs

Moment Air Duct Cleaning cleans dryer vents from the connection behind the dryer to the exterior cap, then checks the line and the outside flap. Pricing is $99 for up to 10 feet of vent, plus $15 for each additional foot, and an inspection is included. Long townhome and condo runs often go beyond 10 feet, so it helps to know roughly where your vent exits when you call.

We serve townhomes, condos and houses across Everett and nearby communities. Learn more about dryer vent cleaning or see current rates on the pricing page.