Step 7: Clean out vent pipe leading to the outdoors.
Every dryer venting system is different. This one passes through the wall, under the floor and through the outside wall. Dryer vent lines should be as short as possible. Loosen the hose clamps and disconnect the vent pipe running under the floor. Pull apart the sections of duct. The longer the dryer vent pipe run, the more buildup of lint you can expect in the pipes. It’s not unusual to find a buildup of lint coating the inside of each section of pipe. Without regular cleaning, the lint will continue to accumulate, blocking the passage of air, which will reduce the dryer’s efficiency and pose a fire hazard. To remove the lint, simply vacuum it out of each section of pipe with an industrial vacuum cleaner. Also, vacuum out any flexible connecting duct pipe until it is lint-free.
 Remove and inspect sections of pipe, cleaning out all lint along the way.
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