Napoleon Flexible Aluminum Direct Vent Liner Kit GD-330Simplify Your Fireplace Venting with the Napoleon GD 330 4x7 Direct Vent Fireplace Venting Component Vent Kit (10 ft) Need a reliable and efficient venting solution for your Napoleon fireplace? The Napoleon GD 330 4x7 Direct Vent Fireplace Venting Component Vent Kit (10 ft) is designed to provide a durable and efficient venting solution for your Napoleon fireplace. This kit includes 10 feet of 4x7 inch direct vent pipe, ensuring proper airflow and