Ventilation and Ducting
- Home Energy
- Discovering Ducts (with links to related articles at the bottom of the page.)
- DuctWorks Heating and Cooling
- simplyplumbing.com – Ventilation supplies
- Audubon Plumbing Supply Co.
- AmericanHVACparts.com
- PexSupply.com
- globalindustrial.com – has R-8 flexible ducting.
