Homeowner checklist

Backdrafting and carbon monoxide: when exhaust changes the house

Use these steps to plan, check and keep a record of your next actions.

• Identify appliances that use room air and those with sealed combustion.
• Tell the assessor about exhaust-fan, range-hood or air-sealing changes.
• Ask how the proposal affects house pressure and venting.
• Confirm applicable makeup-air requirements and qualified testing.
• Keep corrected findings, commissioning records and CO-alarm instructions.

Notes & questions to follow up