About this 3D model

Key features of this design include:-Separate inlet and outlet valves prolong the lifespan of the intake filter.(humidity of exhaled breath always shorten the filter life)-By design the flexible mask will fit on any face. (Or use hairdryer and scissor for best fitting)-100% infill so no hollow structure,-Modular System for future extension.-Remix template for makers Always check https://www.thingiverse.com/thing:4280201 for update before your next print.