Materials:
- plastic bottles – 3 pcs.;
- cotton wool;
- gauze or bandage;
- insulating tape;
- rubber;
- self-adhesive sealing tape;
- rubber glove;
- M4 screws with nuts – 6 pcs.
Making a respirator
The bottom and neck are cut off from a 2 liter plastic bottle. The bottom will be used as a respirator half mask, so the cut should be as neat as possible.
The bottom of the bottle consists of 6 stiffening ribs. In 3 adjacent ones you need to cut holes along the diameter of the part of the neck with a thread for the lid.
A neck cut off under the lid is inserted into the central one from the inside, which is secured with its ring. Next, the valve is made.
To do this, small holes are drilled in the cork.
A gasket is cut out for it from a rubber glove.
A disk with a slightly larger diameter than the cap is cut from the wall of the bottle.
Then the valve is assembled with 2 screws, for which holes will need to be made. Assembly order: disc, rubber gasket, cover. After this, the screw nuts are tightened, but not fully tightened. The finished valve is screwed onto the neck of the half mask.
The filter element is made from the neck of the bottle, which retains part of the wall. A layer of cotton wool is placed in it and secured with gauze.
The gauze itself is tied with electrical tape.
You need to make 2 such filters and insert them into the side holes of the half mask from the outside. Caps with a valve for the necks are made in the same way as before.
Next, the half mask is tried on and cut according to the curves of the face. An elastic band is installed on it, and a sealing tape is glued along the sharp edge.
Using a stapler, we attach an elastic band that will hold the respirator on the face.
Since the central and side valves are installed in different directions, when air is inhaled, only those with a cotton filter open. During exhalation, they are blocked and gas is released through the central valve. This half-mask respirator can be used to filter dust, vapors, paint particles and microorganisms present in the air.
The main advantage of the design is the ease of replacing the filter element. You just need to throw away the old gauze and cotton wool and insert a new one.
