Fire rated protection shutter BA.. K 90-DIN 18017 and K 30 DIN 4102 Prevents the transmission of fire andsmoke through ventilation ducting orventilation openings in other fire sectors. For insertion in spiral ducting and withmounting sleeve for installation in fireresistant walls.Pages 266-267 Fire protection valve BTVK 90-DIN 18017 and valve with firerelease cone BTK K 90-DIN 4102 Shutter element with air flow throttle to prevent fire and smoke transmissionthrough ventilation ductings or ventila-tion openings. Suitable for insertion in spiral ducting and with mounting sleevefor installation into walls. Pages 268-269
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