QUICK DELIVERY

Round spiral duct and fittings mostly are stock items that can be delivered quickly. Once delivered, many round spiral duct sizes can be handled easily by one man.

LOWER INSTALLATION COSTS

Round spiral and flat oval ducts:
- have longer lengths between joints,
- are easy to adjust to exact lengths,
- are easier to hang and have less hangers,
- are lighter in weight,
- have easier to seal joints,
- require less or no reinforcement,
- often require less space

FLAT OVAL SPIRAL DUCTS

Flat oval spiral ducts offer an alternative to rectangular sheet metal ducts, falling in between round spiral and rectangular ducts in most areas.

As noted before, air leakage, rigidity, the use of slip joints and lighter weight are characteristics similar to those of round spiral ducts.

Extra reinforcement requirements and additional duct surface area puts flat oval duct somewhere in between round spiral and rectangular duct, and flat oval duct and fittings normally are not quick delivery stock items.