a replaceable particulate filter element designed to be used inside a compatible mask or respirator. It acts as a barrier to filter out airborne particles, dust, and aerosols.

Key Specifications & Certifications

• Brand: Stanley
• Model Number: ST22117
• Standard Rating: KN95 (Certified under the Chinese GB 2626-2019 standard)
• What this means: It is rated to filter out at least 95% of non-oily airborne particles (such as dust, pollen, wood shavings, and certain biological aerosols). It offers protection equivalent to the US N95 or European FFP2 standards.
• Orientation Note: The text "Mask side / 此面朝向面具" indicates that this specific side must face inward toward the mask body when you install it, ensuring correct airflow and filtration.

Common Uses

Filters like this are typically used for:

• Sanding, grinding, or sawing wood and drywall.
• Working in dusty environments or construction sites.
• Protection against non-toxic airborne particles and allergens.