Oval ducts can even be 12 feet long, unlike rectangular ducts which can only go up to 5 feet long.
This factor leads to lesser number of joints,
which in turn means less air loss and maximum efficiency.
The oval ducts also do not bulge due to air pressure like in other duct shapes.
There Are two sub types In Oval Duct
- Spiral Oval Duct
- Flat Oval Duct