Step 1
Measure out the route for the dryer venting through the crawlspace. This will give you an idea of how much venting is needed.
Step 2
Turn off the electrical supply for the dryer by unplugging it from the wall.
Step 3
Find a location on the exterior of your ductwork. Hold the duct up against the wall and trace the outline on it with a pencil or marker. Drill a pilot hole with a power drill and drill bit. Cut out a circular hole with a jigsaw and appropriate cutting blade for the wall material. Sand down the edges with sandpaper.
Step 4
Insert the exterior duct into the hole in the wall. Secure with screws.
Step 5
Drill out any holes in walls or ceilings to access the crawlspace in the same manner as you did through the wall. Use a portion of the ductwork as a template when cutting the hole size. Sand down any rough edges with sandpaper.
Step 6
Loosely fit together the ductwork between your dryer and the exterior duct.
Step 7
Install a dryer booster fan in the crawlspace on long duct runs. The exact length of your duct before a fan must be installed will depend on your local building codes. Wire this fan into the electrical circuit. Install a switch near the dryer so you can control the dryer booster.
Step 8
Connect the ductwork between the dryer and the exterior duct. Fit the duct pieces together. Secure each piece to the next by wrapping the connection with foil duct tape.