Gas masks are one of the most reliable means that are used for individual protection of a person. They are used both in the exercises of military personnel and employees of special services, and for the evacuation of citizens in the event of a catastrophe.
The dimensions of gas masks, a table of which is provided for each batch of products, are very important in the proper selection and reliability of the product in the future. For the correct selection, you should determine the type of gas mask (civilian, civilian with a mask, etc.). After the calculation of the circumference of the head. For the most successful selection of the circle is measured according to one of the following schemes:
The horizontal circle is summed with the vertical circle. The result obtained is the key parameter of the task, how to determine the size of the gas mask. The product table in the first column contains the certified size, and in the second - the summed head circumference.
A simpler, but less reliable recognized second method of determining size. For its calculation, only horizontal girth (from the back of the head and 20-30 mm above the edge of the ear) should be measured.
Determination of the individual size of the gas mask of civil GP-7
The main function of gas masks is to protect the human senses and respiratory system from toxic substances. This modification of PPE (personal protective equipment) is used to protect a person from radioactive substances, biological weapons, etc.
Set GP-7 consists of:
- bags;
- filter (absorbing box);
- insulation cuffs and MNU-3;
- pressure cord;
- Operating Instructions;
- films with anti-fogging effect;
- the gas mask itself.
PPE is placed on the bag (necessarily shoulder). It is made of natural fabric and has additional pockets. A lap belt is included.
This tool is made in two forms. The first - with a standard set of bags and a regular mask, the second has a tube for taking water. Despite the difference, the table of sizes of gas masks GP 7 is identical to the table for GP 7B.
Dimension and main technical characteristics
The ratio of the length of the front to the size of the PPE| front size | 1 | 2 | 3 |
| total head circumference (cm) | less than 118.5 | 119-121 | 121.5-123.5 | 124-126 | 126.5-128.5 | 129-131 | 131.5 and more |
The main technical characteristics include:
- set weight excluding bags - up to 900 grams;
- working temperatures - from (-40) to +40 degrees;
- field of view - at least 60 degrees.
As you can see, the table of gas mask sizes takes into account a tolerance of 5 mm on the circumference of the head for each girth. Such a gap allows you to choose the most optimal size.
Elements of design and purpose of the civil gas mask No. 5 (GP-5)
This type of protection is somewhat different from earlier models. The modification of this gas mask does not contain a connecting gas tube (which is made of corrugation), but is directly connected to the filter.
Before use, it should be remembered that the civilian gas mask of the fifth model was discontinued in 1989, so it may contain some defects.
The set of PPE for the model shown consists of:
- bags;
- front part (made in two types: ordinary - -62 and refined - -62);
- gas mask boxes;
- boxes with films.
Below is a table of sizes of gas masks GP-5.
| required PPE size | 0 | 1 | 2 | 3 | 4 |
| vertical head circumference, mm | up to 630 | 635-655 | 660-680 | 685-705 | 705 and above |
Since the gas mask is made in the form of a mask, the circumference is measured along the vertical part of the head. The main requirement for proper selection is to fit the mask close to the face.
The disadvantages of this type of protection are:
- significant resistance of the filter box (significantly complicates the breathing process);
- unreliable sealing, which increases pressure on the front.
Modern gas masks for industrial use
In addition to civil and special gas masks, there are also industrial ones. The main objective of such tools is to protect human organs from the effects of irritants and toxic substances in the enterprise. Gas masks of this purpose are effective, even if the proportion of oxygen in a toxic medium does not exceed 17%.
The complete set of such gas masks practically does not differ from the standard complete set of civilian.
Before use, it is important to learn how to determine the size of the gas mask. The table below is designed to select a standard mask.
| The total volume of the head, cm | up to 92 | 92-95.5 | 95.5-99 | 99-102.5 | 105.5 and higher |
| Suitable size | 0 | 1 | 2 | 3 | 4 |
Features of measurements for some types of gas masks
In special cases, it is necessary to use a gas mask of non-standard sizes. These sizes include children's. Measurement should be carried out using a caliper or ruler from the chin to the recess on the nose.
According to the data obtained, the sizes of gas masks are determined. The table of children's PPE is presented below.
| Type of PPE | Mask type | 1 | 2 | 3 | 4 | 5 |
Measurement result |
| PDF D | MD 3 | 78 | 79-87 | 88-95 | 96-103 | - |
| PDF W | MD 3 | - | - | 88-95 | 96-103 | - |
What to consider when choosing a gas mask
Determining the size of the gas mask (the table is attached to each batch of products) is an important point. In addition to performing this action, it is important to pay attention to the integrity of the protective equipment before use: it should not contain cracks or other mechanical damage. Glass, as well as tubes, connecting valves must also be tight and intact.
Important! The size chart of gas masks is individual for each type and modification. It is for this reason that before use, you should carefully study the features and purpose of a particular type of gas mask. Failure to follow the instructions for use can lead to negative consequences.