How to Install a Dryer Vent

Plan Ahead

Plan the path for your dryer vent using the shortest and most direct route. Here's how:

• Make a list of the materials needed and the necessary length of the ducting.
• Check the manufacturer's recommendations for the maximum duct length, depending on which type of ducting you use.
• Subtract 4 to 10 feet from the maximum duct length for each elbow you use.
• Check the manufacturer's instructions, as installation can vary from model to model. Typically, building codes say 25 feet is the maximum ducting length, subtracting 5 feet for each elbow.
• The best route to venting outdoors is a horizontal path, preferably pitching 1/4-inch per foot. This slight angle helps prevent moisture from collecting in the ductwork or going backward into the dryer.

Install the Wall Vent

Measure and drill a pilot hole before committing to a specific location.

• After drilling the pilot hole, check that the wider final hole (4 1/2 inches wide) won't cut through a stud, joist, or sill plate.
• Drill a 4 1/2-inch diameter hole in the side of the house. This is easiest to drill with a large hole saw, a reciprocating saw, or a jigsaw. If you have a stucco wall, use a series of small holes to outline the opening for the duct and then break it out.
• After cutting the hole, the vent tailpiece is inserted into the hole from the outside. Screwed in place and seal with exterior caulk. 

Measure and Cut Vent Tubing

• Set up any elbows or bends and measure the distance from the dryer to the vent.
• Duct pipe usually comes in 5-foot lengths.
• If you use rigid ducting, measure it first and cut it to size using tin snips before connecting the seams. Wear gloves to protect your hands since rigid ducting is very sharp after being cut.
• Once the ducting is cut to size, align the seams by starting from one end, pushing both sides down and in, and forcing them together.

Connect the Duct

• If using aluminum flex ducting, use a piece of pipe to roll the rounded edges of the flex on the concrete. This will flatten the ends, so it is easy to slide them onto the dryer vent tailpiece and the wall vent.
• Once the ducting is in position, use clamps to tighten both ends.
• If using rigid ducting, use aluminum tape to fasten it to the vent outlet and dryer tailpiece. 
• If there are long runs of ducting, make sure to strap the duct to the wall or ceiling joists for support; don’t count on the seam tape holding the weight of the ducting.

Test the Dryer

• Double-check to ensure the ducting did not become kinked or disconnected when the dryer was pushed into position.
• Run the dryer, ensure the joints are connected, and the duct louvers open outside the house.