The 4", 90° adjustable elbow swivels a full 360° at the base. It is adjustable from 0° - 90° for all of your installation needs. Elbows help you to avoid obstructions in installations with B vent pipe lengths in many exhaust applications. It can be used with natural gas or liquid propane, Category 1 appliances.
A 1" clearance to combustible materials must be maintained. To calculate Outer Dimension (OD) add 5/8".