Pro tip: Use no more than 25 feet. of 4-inch duct, and subtract 5 feet for every 90-degree turn and 2 1/2 feet for every 45-degree turn for dryer vent installation. For example, a dryer with a 90 ...

Rigid duct must be insulated and sealed from condensation-producing air leaks. A common bathroom exhaust ducting mistake is reducing the 6-inch ERV take offs to the 4-inch duct that’s commonly used in ...