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Description
4229 120 1800 STIHL Air Filter – Genuine OEM Replacement
The STIHL Air Filter (4229 120 1800) is a genuine OEM replacement filter designed to protect the carburetor and engine from dirt, dust, and debris in a wide range of STIHL handheld blower and blower-vac units. A clean air filter is critical for proper air–fuel mixture, smooth engine performance, and long-term durability.
Dirty or clogged air filters restrict airflow, leading to rich running conditions, reduced power, hard starting, and accelerated carburetor wear. Installing this genuine air filter helps ensure your blower runs efficiently and reduces maintenance issues caused by contaminated air intake.
Manufactured to exact STIHL specifications, this OEM air filter delivers correct filtration performance, proper fitment, and reliable protection under professional working conditions.
Product Details
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OEM Part Number: 4229 120 1800
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Brand: STIHL (Genuine OEM Replacement)
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Part Type: Air Filter
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Application: Air intake filtration for blower and blower-vac units
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Condition: New Genuine OEM replacement
Function
This genuine STIHL air filter is designed to:
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Capture dirt, dust, and debris before entering carburetor and engine
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Promote correct airflow for efficient combustion
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Protect internal engine components from contamination
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Improve starting, power, and throttle response
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Extend carburetor and engine service life
⚠️ A dirty or clogged air filter can reduce engine performance and increase wear on internal parts.
Verify Fitment (Recommended)
Before ordering, confirm:
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OEM part number 4229 120 1800
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Your unit’s model matches one listed below
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Application matches your STIHL illustrated parts diagram
Compatibility
This air filter fits the following STIHL blower and blower-vac models equipped with carburetor and air filter assemblies:
Blowers / Blower-Vacs
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SH 85-D (Carburetor, Air filter)
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SH 85 (Carburetor, Air filter)
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SH 55 (Carburetor, Air filter)
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BG 85-D (Carburetor, Air filter — BG 85-DZ)
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BG 85 (Carburetor, Air filter — BG 85 | BG 85-Z)
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BG 65-D (Carburetor, Air filter)
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BG 65 (Carburetor, Air filter)
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BG 50 (Carburetor, Air filter)
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BG 46-D (Carburetor, Air filter — BG 46-DZ)
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BG 46 (Carburetor, Air filter — BG 46-Z)
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BG 45 C KAT (Carburetor, Air filter — BG 45)
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BG 45 (Carburetor, Air filter — BG 45-Z)
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BG 55 (Carburetor, Air filter)
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BG 55 C KAT (Carburetor, Air filter)
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BR 45 C (Air filter, Carburetor)
(Exact fitment depends on production version — always verify using OEM parts diagram.)
Installation Notes
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Remove old air filter from housing
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Inspect air filter housing for debris
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Install new 4229 120 1800 air filter ensuring proper seal
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Replace or clean fuel filter if performing broader service
Maintenance Tips
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Check air filter regularly on dusty jobs
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Replace when clogged or after heavy use
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Always use genuine STIHL OEM air filters for correct protection
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Clean air filter housing and intake screen periodically

