There are a couple reasons that it is imperative that you clean out your dryer vent.
A. To help prevent dryer vent fires
A dryer vent which is packed with lint can catch fire quite easily. If you look in our photos you will see a dryer that had caught on fire because the vent had not been cleaned and all the lint removed.
B. Another reason that you would have your dryer vent cleaned is to let your dryer operate at maximum capacity. With a vent that is clogged with lint the moisture is trapped in the dryer and cannot escape as easily. Therefore it will take much longer for your clothes to dry. A common problem is two or more dry cycles just to get the clothes to dry or in some cases clothes not drying at all. When all the lint is removed your dryer is allowed to freely expel all moisture and hot exhaust outside the home therefore increasing the efficiency of the dryer
C. One more reason that it is, running a dryer with a clogged dryer vent puts a heavy strain on the dryer. When this happens it can cause the dryer to break parts to burn out and an overall strain that the dryer has to endure because it cannot expel the hot air and moisture with ease.
It is usually recommended that you clean your dryer vent every 1 to 3 years depending on the length of the dryer vent and how many turns it has. A dryer vent that is over 30 feet should be cleaned once a year and a dryer vent that is 10 feet or less can go up to three years or more.