There is a snake in a bathroom vent. How do I get it out of the house?
In general when a snake is hiding indoors a damp towel is placed in the area. The snake crawls under it and it can be removed from the area. However, this sounds like a tight location and other means may be required. See our snake publication http://extension.umd.edu/sites/default/files/_images/programs/hgic/Publications/HG64_Snakes.pdf
Also, please call the Nuisance Wildlife Information Line at 1-877-463-6497 to help you diagnose the situation. They have a listing of wildlife cooperators that may be needed for removal of the snake.
The Nuisance Wildlife Information Line enables homeowners to receive guidance on nuisance, injured, or sick wildlife. This service is provided jointly by the MarylandDepartment of Natural Resources (DNR), Wildlife and Heritage Services, and USDA-APHIS.