AAHR Planning Guide
Bathroom Ventilation & Humidity Guide
Plan fan capacity, sound level, controls, duct routing, shower use, and maintenance for a more comfortable bathroom.
Discuss Your Project
What to compare
- Airflow capacity
- Sound rating
- Humidity-sensing control
- Light or night-light options
- Duct size and routing
Why ventilation matters
- Manage moisture
- Improve mirror clearing
- Protect paint and finishes
- Support comfort
- Reduce lingering odors
Installation planning
- Fan location
- Exterior termination
- Electrical control
- Ceiling access
- Coordination with recessed lights
Frequently Asked Questions
Should the fan be directly over the shower?
Placement depends on the fan rating, shower location, ceiling design, electrical requirements, and the overall airflow path.
Is a humidity sensor useful?
It can help operate the fan consistently when moisture rises, especially when occupants forget to switch it on.