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 refrigerator doors themselves.
• Curtains. They are not insulated and only insulate the air passage.
They may be curtains of forced materials or more or less flexible materials.
Isothermal doors are also classified in other respects:
• Hinged or pivoting
• Running or sliding
• Vertical opening
• One sheet
• Two sheets
• Dumpers
• Folding bookcases
• Manual, motorized and automatic
The curtains can be:
• Air curtains
- Vertical
- Horizontal
• With return air
- Of plastic strips
From going to come
- Rolling (automatic, manual)
