There are a few warning signs that your dryer vent may be clogged before it gets to be a big problem. If you notice excessive dry times, a burning smell coming from your dryer, see sizeable lint in your dryer, or feel the dryer heating up more than normal are signs that you have a clogged dryer vent and need a professional to come and clean it out for you before a risk of fire presents itself.
If the top of your dryer is getting hot to the touch that is one sign of a vent that may need cleaning and you should get your vent cleaned right away.
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