The principle of the protective action: the contaminated air used for breathing is beforehand cleaned of the contaminants by special filters and absorbers.
The gas-mask kit includes: filtering and absorbing box, face mask, bag for carrying, box with anti-fog films.
The face mask is equipped with a speech diaphragm with improved valve system of inhalation and exhalation.
The front part of the mask is not completed with the connecting corrugated tube, and is directly attached to the protection box. This detail differs GP- 5 from the military model.
A gas mask is used when the command “Gas” is carried out, on the signals “Chemical attack”, “Radioactive contamination”, “Bacterial contamination”, as well as on their own (without commands and signals) on the evidence of radioactive, toxic and bacterial agents in the air or on the area.
The face mask is available in five sizes: 0, 1, 2 , 3, 4.
The marking is applied in a convex mold impression in the chin part (the size is stated with a figure in the circle).
To determine the size you need to measure your head along the closed line passing through the crown, cheeks and chin.
The measurements are rounded up to 13/64 inch (5 mm).
When measurement value to 24 51/64 inch (630 mm) the zero size is taken; from 25 inch (635 mm) to 25 25/32 inch (655 mm) – the first; from 25 63/64 inch (660 mm) to 26 49/64 inch (680 mm) – the second; from 26 31/32 inch (685 mm) to 27 3/4 inch (705 mm) – the third; from 27 61/64 (710 mm) or more – the fourth.
The mask is assembled in the following way: take the face-mask in the left hand, screw the filtering and absorbing box into it with the right hand to the full.
Before the first use, wipe the inside and outside of the mask with a clean cloth slightly moistened with water, and blow the exhalation valves.
The assembled mask is placed in the bag: down – the filtering and absorbing box, above – the face mask, which is not folded, only the head and the side part are slightly turned up, so as to protect the glasses.
To set the mask to the stowed position, one is to wear the bag with the mask over his right shoulder so that it is on the left side, adjust the shoulder strap using the buckles so that the top edge of the bag is at the level of the waist belt, fold the mask into the bag. If necessary, the mask can be attached to the belt with a braid.