Reply to bathroom fans - should they vent through the roof?

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Reply to "bathroom fans - should they vent through the roof?"

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[quote=Anonymous]Chatbots are perfect for these sort of questions

For a bathroom exhaust fan installation, there are a few acceptable options, but venting through the roof is generally considered the best practice. Let me explain the main approaches:

Best option - Through the roof:
- Provides the most direct path for moisture to exit
- Prevents condensation from dripping back down
- Less chance of moisture accumulating in the attic
- Allows water vapor to immediately exit the house

Acceptable but not ideal - Through soffit/eaves:
- Can work if properly installed with insulated ductwork
- Must ensure proper slope to prevent water poolback
- Should terminate at least 3 feet from any soffit vent intake
- More complex installation to maintain proper slope

Not recommended - Terminating in attic:
- Can lead to mold and wood rot in attic space
- Moisture can condense on roof sheathing
- May cause insulation to become wet and lose effectiveness
- Violates most building codes

Key installation tips regardless of route chosen:
- Use insulated duct to prevent condensation
- Keep duct runs as short and straight as possible
- Ensure proper slope (1/4 inch per foot minimum)
- Install a proper vent cap with backdraft damper
- Seal all duct connections with foil tape

Would you like more specific details about any of these approaches?[/quote]

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