portable backboard part of air breathing apparatus

Specifications:

The  backpack mainly composes of backboard, shoulder strap, waist belt, belt buckles, pressure reducer holder and tank band. Shoulder belt, waist belt, pressure reducer and air cylinder are all fixed on the backboard. The backboard is designed in complete accordance with human engineering. Its appearance fully fits human back curves with large contact surface and comfortable wear. The backboard is made by injection molding of flame-resistance engineering plastics and carbon fiber material with high strength.

  Detail pictures:

full face mask respirator breathing apparatus mask