Bathroom vent ducts should extend out the roof - Gettum Associates, Inc.
Bath/Kitchen Exhaust Fan - Roof Vent w/ Extension | FAMCO
Master Flow 6 in. Goose Neck Vent Roof Cap in Black GNV6BL - The Home Depot
Master Flow Goose Neck 7-in x 9-in Galvanized Steel Vent and Pipe Flashing in the Vent Pipe Flashing department at Lowes.com
Installing a Bathroom Fan - Fine Homebuilding
How To Prevent Ceiling Stains Around Your Bathroom Exhaust Fan
Shop Bath/Kitchen Exhaust Roof Vents | Fast Shipping | FAMCO
Master Flow 6 in. Goose Neck Vent - Roof Cap GNV6 - The Home Depot
Roof Mount Whole House Fan with Damper Box, Duct and Grille
Active Ventilation 4 in. Dia Keepa Vent an Aluminum Roof Vent for Flat Roofs KV-4 - The Home Depot
Broan Metal Roof Vent Kit at Lowes.com
Amazon.com: ECO HOUSE Solar Powered Roof Vent Exhaust Stainless Steel 5-inch Fan Ideal for Roof Attic RV Boats 12 CFM Only Exhaust ventilation : Tools & Home Improvement
Roof Ventilation & How to Vent Roofs - Methods, Types, Fans - Ecohome