gas mask 3d model

The mask features a rigid front housing made from lightweight ABS with an integrated air-intake module positioned at the lower front, containing a snap-fit replaceable HEPA H13 cylindrical filter (35–45 mm diameter, 20–30 mm thickness) seated in a sealed compartment with a silicone O-ring. A compact brushless micro-fan (25–30 mm, 5V) is mounted directly behind the filter to generate positive airflow of 2.0–2.5 L/min into the inner breathing chamber, which is shaped to maintain a 15–20 mm air gap from the face using soft TPU contours. Two one-way exhaust valves (12–18 mm) are placed symmetrically on the left and right sides of the mask body, allowing exhaled air to exit without mixing with incoming purified air. A flexible silicone face seal (2–3 mm thick) ensures airtight contact along the nose, cheeks, and chin. The battery module (3.7V 500–800 mAh Li-ion) is embedded in the lower chin extension with a USB-C charging port, delivering 4–6 hours runtime. A removable polycarbonate front shell protects the inter