Egis BlastSwing B170H

Blast freezing is the harshest duty a door sees: -40 C air, thermal shock on every opening, and frost that defeats ordinary hinges and latches in weeks. The BlastSwing B170H is the hinged version of the BlastShield B170 slider, built around the same 170 mm PIR insulation core and a frost-proof hardware package specified for -40 C service.

Every metal part that moves is rated for the duty, not adapted to it — the cam-lift hinges, the latch mechanism and the gasket heaters are all specified for -40 C operation. The threshold is heated, the gaskets are dual and heated, and the inside safety release is designed to be found and operated in full freezer PPE, where dexterity is minimal and visibility is poor.

Egis recommends the B170H for blast-freezer cells, spiral-freezer infeed rooms and plate-freezer anterooms. Clear openings run from 800 to 1400 mm wide and 2000 to 2600 mm high. For high-cycle automation at the same temperature, the BlastShield B170 slider is the companion product.

At -40 C, ordinary hardware fails in two ways: metals embrittle and lubricants solidify. A hinge that works at room temperature can snap or seize after weeks of blast-freeze cycling, and a latch adapted from a chiller door will freeze at exactly the moment it is needed. The B170H's hinges, latch and gasket heaters are specified for -40 C from the start — materials, clearances and lubricants chosen for the duty — so thermal shock is a design condition, not a surprise.

The seal line gets the same treatment. Dual heated gaskets hold the leaf perimeter above freezing while the heated threshold keeps the doorway ice-free, because at -40 C any moisture that reaches an unheated seal becomes ice within minutes. The 170 mm core keeps the leaf faces warm enough to avoid the condensation that would otherwise sheet the door in frost on the warm side.