PVC strip curtain
Short definitionClear strips hung in the door opening. The cheapest way to reduce the air coming in while the door is open.
The strips are hung so that they overlap. People and vehicles pass between them and the strips fall closed behind. For as long as the door stays open, the curtain blocks most of the air flow.
Freezer rooms use strips that do not stiffen in the cold. The curtain can be hung inside or outside the door. On a hinged door it goes on the side opposite to the one the leaf opens towards.