Fastening device for coupling ducts of heat exchanger

A fastening device for fluid tightly coupling a first duct body and a second duct body of a heat exchanger, the fastening device comprising:

• a support member configured to couple with a connecting edge of the first duct body;
• a pivot pin coupled to the support member;
• a locking device coupled to the support member and disposed at an offset distance from the pivot pin along a radial axis of the fastening device;
• and
• a pivot arm having a first end configured to engage with the pivot pin and a second end configured to engage with a flange of the second duct body,
• wherein the support member comprises a bottom end configured to couple with the pivot pin and a top end configured to directly couple with the locking device, and
• wherein the locking device is configured to engage with the pivot arm and move the second end of the pivot arm relative to the pivot pin to fluid tightly engage the flange of the second duct body with the connecting edge of the first duct body.