Routing a bath vent duct down & out or up through an attic or roof
Broan-NuTone LP80 LoProfile Ventilation Fan, Wall- or Ceiling-Mount Exhaust Fan for Bathroom and Home, 1.0 Sones, 80 CFM, 4" Round, White : Amazon.ca: Tools & Home Improvement
Best Practices: Bathroom Venting - GreenBuildingAdvisor
Routing a bath vent duct down & out or up through an attic or roof
Utility Fans & Through-Wall Fans
How to Install a Bathroom Vent Fan for a Mildew-Free Space