Modern civil defence shelters and protected facilities require entrance systems capable of maintaining an airtight barrier between the protected interior and the external environment. In vestibule configurations, gastight doors serve as a critical engineering component by preventing the penetration of hazardous substances while preserving the integrity of the shelter envelope. The DU-IV Gastight Door is designed specifically for this purpose and is available through the offic

The SU-III RWRT is a top-opening blast and gastight shelter hatch designed for protected facilities and civil defence shelters. According to the published product description, the hatch is designed for blast pressure of up to 440 kPa (4.4 bar) and is intended for horizontal, top-opening installation. Atmas Group The product is available with different clear opening dimensions and can be installed either during new construction or as a retrofit solution. SU-III RWRT — product