Delta Fin SF125 and SF200 multi fin is the right choice for uniform convection heating. This system can either be used for heating the greenhouse from the perimeter or can run under the gutter for snow melting. Constructed of aluminum, it dissipates heat quickly which results in energy efficiency. The external surface of 100 lineal feet of Delta Fin SF200 can produce as much heat as approximately 844 lineal feet of 2in bare pipe. This high BTU output means you need fewer units. It is easy to install because the fitting does not require threading to connect with the all-aluminum coupler, and the simple design makes it easy to maintain or replace parts. The Delta Fin SF is available in 2in and 1.25in with a stock length of 12 feet.