CONSTRUCTION FEATURES:

Sierra coils are made with copper pipes featuring the following outer diameters:
7 mm | 7,94 mm (5/16") | 9,52 mm (3/8") | 12,7 mm (1/2")

The inside of the copper pipes can be smooth or ribbed.
The 9,52 mm (3/8") è pipe is also available in aluminium.

The available geometries (tube spacing) x (row spacing) are:
21 x 12,7 mm | 25 x 12,5 mm | 25 x 19 mm | 25 x 21,65 mm | 25 x 25
mm | 31,75 x 27,5 mm

The fins can be made of aluminium (with special surface finishing on request) or copper, with the following shapes:
flat | corrugated | louver

The frame can be made of:
galvanised steel | aluminium | aluminium alloys

The coils can be supplied with the following finned block:
flat | L bend | U bend | round