The fire-resisting doors are made of cold-rolled galvanized steel: leaf of 1.0 mm in thickness, door-post of 1.5 mm in thickness, two models (for mounting in the center of the duct and with a frame for mounting at the end of the duct). Filling of a special technology, high-density stone wool, leaf thickness is 62 mm, door-post thickness is 105 mm. The leaf may be with or without a glassing, the door-post may be with and without a door sill. The doors are made according to the customer's dimensions and may be single-leafed or two-leafed. The doors are certified in the Fire Research Centre of the Fire and Rescue Department under the Ministry of the Interior and have the conformity (certification) mark GĮAŽ-01. The doors meet the obligatory requirements of LST EN 16034:2014.