It’s best to vent the clothes dryer directly to the outside of the building. In fact – the building code requires it to be terminated outside the building. For the few homes that are built on a crawl space, that doesn’t mean you can or should terminate the dryer under the house. The building code says that’s a no-no too.
During maintenance you’ll want to be assured the top of the vent is kept open. A blocked vent can be caused by leaves, dead animals and ice dams (in very cold climates). Another “not-so-common” way