Introduction The DU-III Blast & Gastight Door is a protective shelter door designed to withstand blast pressure exceeding 440 kPa (4.4 bar) and provide gas tightness. According to the product information published by Atmas Group, DU-III doors are designed for civil defence shelters and other protected facilities. They are available in single-leaf and double-leaf configurations. Atmas Group The door leaf is constructed from reinforced beams with steel cover panels. The design

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