Dundas Jafine's aluminum elbows can be used to vent most types of heating units. This product features an all aluminum, four-piece construction and is fully adjustable to 90 deg. Includes one crimped end and one solid end to ease assembly. The E432 heavy-duty aluminum elbow is made of 0.016 in ga aluminum which is thicker than our traditional elbow. This heavy-duty elbow offers more rigidity to the application and better handling to the contractor.