U.S. imports of Intake Air Filters for Internal Combustion Engines (HS 842131) totaled $56.1M in August 2026, imported from 57 countries.
Importers of Intake Air Filters for Internal Combustion Engines paid $5.1M in duties in August 2026, an average duty rate of 9.19% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Intake Air Filters for Internal Combustion Engines imports of $56.1M in August 2026 ran 11% above the year-to-date monthly average of $50.4M.
Last updated: August 2026 dataIntake air filters — which remove particulates from combustion air before it enters the engine — are a critical wear-replacement component across automotive, trucking, agricultural, and construction equipment sectors. Mexico is the primary US import source, underpinned by integrated North American automotive manufacturing, while China is a significant secondary supplier subject to Section 301 tariff exposure. Unlike oil or fuel filters, intake air filters are classified separately under 8421.31, so mixed shipments containing both air and fuel filters require line-item separation on the commercial invoice.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
6.1K import shipments a month
Intake air filters (8421.31) are specifically designed to clean combustion air entering an internal combustion engine. Cabin air filters, which purify passenger-compartment air, are not engine components and classify differently — typically as parts of motor vehicles or HVAC equipment. The functional destination of the filtered air is the controlling distinction.
No. Intake air filters (8421.31) and oil or fuel filters (8421.23) are separate HTS subheadings and must be declared on separate tariff lines. Combining them on a single line risks misclassification and potential penalties; the commercial invoice should itemize each filter type with its applicable HTS code.
Subheading 7 of 12 in heading 8421
Subheading 842131 · $56.1M of $1.4B
ImportsExports
Imports
$56.1MYoY · free account
Exports
$53.8MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $610.4M of Intake Air Filters for Internal Combustion Engines and exported $638.8M.
Through August 2026. Source: U.S. Census Bureau.
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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8421310000 | Intake Air Filters for Internal Combustion Engines | $55.3M | 9.19% | 54.42% | $5.1M |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8421310000 | Intake Air Filters for Internal Combustion Engines | $53.8M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Imports · August 2026
origin
Mexico and China together supply 56% of it. China pays 38.4% duty; Canada 0.5%.
customs district
destination
entry
rate provision · imports
44.9% enters free of duty; duty collected equals 9.19% of imports for consumption.