Pull the vent cap and duct apart to make measuring easier. Stop and pry out siding and sheathing from the saw as you go.

The vent should be a 4-inch smooth, round hard metal, not bunched-up corrugated plastic or vinyl tubes or rectangular. There are several gauges of galvanized or aluminum hard duct metal.

3) Support the Washer and Dryer Fasten a sheet of 3/4-inch-thick plywood to the floor below the washer and dryer using 1 5/8-inch deck or woodworking screws.

Wherever possible, use a rigid aluminum dryer vent instead of a flexible aluminum vent because it won't restrict airflow as much, and it's less likely to clog with lint. Fasten a sheet of 3/4-in ...