Nanhe 9009 high efficiency filtration luxury low resistance silicone protective mask (body thread interface)

Advanced liquid silica gel is soft, comfortable, and suitable for long time wear, which is suitable for long time wear.
thread interface structure, convenient and quick filter cartridge exchange,
four valve design, patented product, low resistance, less than 20% resistance than similar products,
double breath valve design, nose and mouth expiratory valve, reduce hot gas in cavity. Circulation, more comfortable;
the upper valve is hidden, and the lower valve cover is protected, so it is not easy to pollute. It’s easy to disassemble and clean;
the head hoop is designed with head shape, which is suitable for Asian head type wearing, and fits better for the working environment of helmet wearing, with polyester spandex elastic band, which has more lasting elasticity;
it can be connected with the filter box and cotton filter box, which can be used as anti-virus or dust mask;
it meets the GB 2890-2009 standard, and GB 2890-2009 standard 2626-2006 standard, obtained European CE certification and Chinese La certification, QS certification.
size: medium , please