To determine the size of the helmet-mask of GP-5,RSH-4, PBF, PMG, GP-5, use one of these methods. The first method involves two measurements of head. Take a tape measure. Apply the tape beginning at the temporal part of the head and lead it along a closed line which passes through the top.
Connecting the free end of the tape from its beginning, will continue the measurement by lowering a tape from the temporal part on the cheek to the chin and let the tape up to the second temple. Thus, you will get the first result that you want to remember. The second result you can get, having the dimension along the line that connects the circle hole passes through the ears and eyebrows.
Total the results of both measurements and determine the size of the mask in accordance with the specified data. If the result is less than 92 cm – size 0; from 92 to 95.5 – size 1; from of 95.5 to 99 – size 2; from 99 to 102,5 – size 3; more 102,5 – size 4.
The second method involves the measurement of the head only along a closed line which passes through the crown, cheeks and chin. Determine the size of the mask according to the specified data. If the result is less than 63.5 cm – size 0; from 63.5 to 65.5 – size 1; from of 66.0 to 68.0 - size 2; from of 68.5 to 70.5 – size 3; more than 71.0 per size 4.
For gas masks PMK and GP-7, which is further provided with adjustable elastics in the back, there are three size of the front part. To determine size, measure with measuring tape horizontal head circumference at the level of the forehead. The same method is used in determining the head size when purchasing caps and other headgear.
Determine the size of the mask according to the specified data. If the result is less than 56 cm size 1; 56 to 60 – size 2; more than 60 size 3.
Advice 2 : How to know the size of the mask
During Soviet times, almost every house had at least one gas mask issued by the school, University or at work. Now, if necessary, a gas mask can be bought in a specialty store.
You will need
Before buying or ordering through a reliable online website mask, you need to know what size will suit you. There are several ways to determine the sizeand mask, depending on the method of measurement and also brand.
If you are going to purchase a gas mask with a helmet-mask (GP-5, RSH-4, PMG, PBF), know your size you will be able in two ways.
Take a centimeter and measure the length of a closed line which should pass through the crown, chin and cheeks. Then measure the length of the line connecting the ear and passing through the superciliary arches. Add the results of the first and second measurements. Round the final result to 0.5 or units.
Find out your size. So, if you got up to 92 cm, then you should purchase a gas mask the size ofa "0" from 92 to 95.5 cm – 1 in the from of 95.5 to 99 cm – "2", 99 to 102,5 cm – 3, the more 102,5 – "4".
In the second method of measuring head for a gas mask one of these brands you will be quite enough to know the length of a line passing through the crown, chin and cheeks. If the length 63.5 cm, then it will fit a size "0", from 63.5 to 65.5 cm old – to 1, from 66 to 68 cm – "2", from 68.5 to 70.5 per – "3" and more than 71 cm – "4".
If you are planning to purchase a gas mask with adjustable back elastic (GP-7, PMK), you will have to make measurements of a different nature. Take a centimeter and measure the horizontal circumference of the head (about the same as it is done in the selection of headgear).
If the circumference up to 56 cm, then you should buy a gas mask of these brands that has the size "1", from 56 to 60 cm – "2," more than 60 cm – "3".
Before finally to verify the correctness of his choice, try a mask of your chosen brand. Don't forget before fitting to remove the hair so that they do not violate its integrity.