Spiral finned tube is a type of heat exchanger that uses fins to increase the surface area of a tube, exchanging heat and between the fluid inside the tube and the fluid outside the tube. Also called a helical fin design, spiral wrapped fins are essentially just that – a helix-shaped fin wrapped around a tube, which increases the contact area between the tube and the fluid inside and outside it. Unlike plate fin designs, which involve multiple tubes passing through a common fin, spiral wrapped fins involve each tube being surrounded by spiral fins for its entire length. Spiral wound finned tubes are mainly used in hot air heating, air conditioning, refrigeration, dehumidification, drying.