supply of hme (heat and moisture exchange) filtermaterial: plastic, end: 15/22 mm female end; 22mm male end. breathing filter should be combination of pleated mechanical filter and electrostatic charge attraction. the filtration efficiency should be more than 99.99% for virus and bacteriahme (heat and moisture exchange) filtermaterial: plastic, end: 15/22 mm female end; 22mm male end. breathing filter should be combination of pleated mechanical filter and electrostatic charge attraction. the filtration efficiency should be more than 99.99% for virus and bacteria,hme (heat and moisture exchange) filtermaterial: plastic, end: 15/22 mm female end; 2 2mm male end. breathing filter should be combination of pleated mechanical filter and electrostatic c harge attraction. the filtration efficiency should be more than 99.99% for virus and bacteria ]