Replace Bathroom Exhaust Fan
Why It Matters
An undersized or worn-out exhaust fan cannot control bathroom humidity, leading to persistent mold problems and wood rot.
Quick Guide
- 1
Gather your tools and materials
You'll need: Screwdriver, Wire strippers, Drill. Materials required: Replacement exhaust fan, Duct tape, Wire nuts.
- 2
Perform the replace bathroom exhaust fan
Remove old bathroom exhaust fan and install a new, properly-sized unit with correct CFM for the room. Safety note: Turn off breaker before working.
- 3
Verify and clean up
Check that the work was completed correctly and clean up your workspace. If if wiring modifications are needed, consider calling a professional.
Tools & Materials
Tools
- Screwdriver
- Wire strippers
- Drill
Materials
- Replacement exhaust fan
- Duct tape
- Wire nuts
Community Tips
Turn off power at the circuit breaker before disconnecting any wiring, and test the outlet with a non-contact voltage tester to confirm power is dead -- electrocution risk is genuine when working with bathroom fan wiring in damp conditions. Broan NuTone exhaust fans ($150-300) come with detailed wiring diagrams, but ignoring this step accounts for most DIY bathroom electrical injuries.
Install ductwork that slopes slightly toward the exterior exit to prevent condensation pooling inside the duct, which causes mold growth and reduces fan efficiency by up to 40%. Flexible ducting like Dundas Jafine Dryer Duct ($12-18) accommodates angled runs better than rigid aluminum and maintains airflow even with minor kinks.
A reciprocating saw or oscillating multi-tool equipped with a metal-cutting blade ($20-40 for bit sets) cuts through the old mounting bracket and ductwork connections far faster than manual wire strippers or screwdrivers, reducing installation time from 2+ hours to under 45 minutes on standard retrofit jobs. ---