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The HSS fire barrier impresses by being highly flexible in planning and execution. It is also easy to retrofit and takes minimum effort to install. As well as meeting the requirements of fire resistance class S90 to DIN 4102-9, when combined with the HSI 150 system seal or HRD press seal, the fire barrier is absolutely gastight and watertight. It is installed in HSI 150 wall inserts or wall sleeves (included at planning stage) or in retrofitted core drills.