Hinge Kits protect your Fan from damage to the Fan's soft aluminum exterior, and electrical connections. Pressure washing a fan without hinge kits is difficult and stresses the electrical connections etc. The hinge kits solve these problems, allowing you to tilt the Fan back to a balanced position making cleaning the Fan much better and without a scratch on the Fan. Hinge kits substantially increase the life of the Exhaust Fan and it's electrical connections.Standard Hinge kit for exhaust fan roof curbs. Includes Hardware. Ships Loose. Used on Fans with wheels 20 inches or smaller. 12 GA Galvanized.