HS Code for Gas filter

The classification for gas filters falls under HS code 8421.39. Heading 8421 is a broad category covering centrifuges and filtering or purifying machinery and apparatus for liquids or gases. Subheading 8421.39 specifically addresses other machinery for filtering or purifying gases, excluding those used as intake air filters for internal combustion engines (8421.31) or catalytic converters (8421.32). This code includes a diverse array of equipment, from industrial-scale gas scrubbers used in smokestacks to small inline filters used in laboratory gas lines. The primary function must be the removal of solid, liquid, or gaseous impurities from a gas stream. This classification is critical for environmental protection technology and industrial safety equipment, as it distinguishes general gas purification from specialized automotive emission control components. The technology used can range from mechanical mesh and activated carbon to electrostatic precipitation, provided the medium being filtered is a gas.

Products Included

• Industrial gas scrubbers
• Air purifiers (excluding domestic room units)
• Inline gas filters for pipelines
• Chemical vapor filters
• Electrostatic precipitators for gas cleaning
• Dust collectors for industrial gas exhaust

Common Misclassification

The most prevalent error is using 8421.31, which is reserved specifically for intake air filters for internal combustion engines. If the filter is for a factory ventilation system or a gas pipeline, it must be 8421.39. Additionally, 8421.29 is sometimes used by mistake, but that code is for filtering or purifying liquids, not gases. Domestic-type air purifiers are sometimes argued to be 8509 (domestic appliances), but they are generally held to remain in 8421.39 unless they are very small, fan-only units. Catalytic converters must be placed in 8421.32.

FAQ

What is the HS code for gas filter?

The HS code for general gas filtering or purifying machinery is 8421.39.

Does this include filters for car engines?

No, intake air filters for internal combustion engines are classified under HS code 8421.31.