They are divided into two main groups:
• isothermal doors. With thermal insulation, they must continue the barrier
which limits the transmission of heat by conduction. They are the cold
themselves.
Isothermal doors are also classified in other respects:
• Hinged or pivoting
• Running or sliding
• Vertical opening
• One sheet
• Two sheets
• Dumpers
• Portefolios or foldable
• Manual, motorized and automatic
• Curtains. They are not insulated and only insulate the air passage.
They may be curtains of forced materials or more or less flexible materials.
The curtains can be:
• Air curtains
- Vertical
- Horizontal
• With air return
- Of plastic strips
From going to come
- Rolling (automatic, manual)
