Fine Dust Motor Filter for Miele Boost CX1 Bagless Vacuums (Washable Pre-Filter Replacement)

Replaces Miele CX FSF (11639250) | Includes Pleated Filter + Foam Pre-Filter

Restore the suction power of your Miele bagless vacuum with this Premium Fine Dust Filter Set for the Miele Boost CX1 series. Designed as a high-quality alternative to the original part (CX FSF / 11639250), this filter fits snugly inside your dust container to separate fine dust from the air stream before it hits the motor.

If your Boost CX1 is starting to lose suction, overheat, or leave dust behind, a clogged inner filter is usually the culprit. This kit includes everything you need to fix it: a durable Washable Pleated Filter to trap microscopic allergens and a Foam Pre-Filter to catch larger debris. Together, they ensure your vacuum runs smoothly, smells fresher, and lasts longer.

Key Features & Benefits

• Dual-Layer Protection:

1. 1. Foam Pre-Filter: Catches larger particles (hair, lint, crumbs) before they can clog the main filter.
   2. Pleated Fine Dust Filter: High-surface-area material traps ultrafine dust and allergens, preventing them from recirculating into your home.

• Washable & Reusable: Unlike disposable paper filters, this unit is designed to be tapped clean or rinsed under water, saving you money on replacements.
• Protects Your Motor: By ensuring optimal airflow, this filter prevents the motor from struggling and overheating, significantly extending the life of your expensive machine.
• Perfect Fit: Precision-engineered to fit inside the dust canister of all Miele Boost CX1 bagless models.

Compatible Miele Models

This filter is suitable for the entire Miele Boost CX1 bagless range, including:

• Miele Boost CX1 PowerLine (SN: 11640630)
• Miele Boost CX1 Cat & Dog PowerLine (SN: 11640600)
• Miele Boost CX1 Parquet PowerLine (SN: 11640590)
• All other Miele Boost CX1 Series

Replaces Part Number: Miele CX FSF, 11639250.

Kit Contents

• 1 x Washable Pleated Filter
• 1 x Foam Pre-Filter Insert

Frequently Asked Questions 

• Q. How do I know if my filter needs changing?
• A. Watch for these signs:

1. Reduced Suction: The vacuum feels weak or won't pick up heavy debris.
2. Overheating: The vacuum cuts out during use (safety thermal cut-out).
3. Noise: The motor sounds high-pitched or strained.
4. Odours: A stale or dusty smell comes from the exhaust.

• Q. How do I clean this filter?
• A. For regular maintenance, remove the filter container and tap the pleated filter firmly against the inside of a bin to dislodge dust. For a deeper clean, you can rinse the pleated filter and the foam insert under cold water. Crucial: Ensure both parts are 100% dry (air dry for 24-48 hours) before putting them back. Using a wet filter will damage your motor.
• Q. Is this the exhaust filter on the back?
• A. No. This is the Fine Dust Filter that sits inside the clear dust bin. The exhaust filter (HEPA AirClean) is located at the back of the machine where the air comes out.
• Q. How often should I replace it?
• A. While it is washable, the filter material degrades over time. We recommend replacing it every 12 months for optimal performance, or sooner if you use the vacuum daily.

Technical Specifications

• Type: Fine Dust Filter (Inner Container)
• Material: Washable Synthetic Pleats + Foam
• Part Number Equivalent: 11639250 / CX FSF
• Fitment: Miele Boost CX1 Bagless Series

Dual-Layer Protection:
1. Foam Pre-Filter: Catches larger particles (hair, lint, crumbs) before they can clog the main filter.
2. Pleated Fine Dust Filter: High-surface-area material traps ultrafine dust and allergens, preventing them from recirculating into your home.
- Washable Reusable: Unlike disposable paper filters, this unit is designed to be tapped clean or rinsed under water, saving you money on replacements.
- Protects Your Motor: By ensuring optimal airflow, this filter prevents the motor from struggling and overheating, significantly extending the life of your expensive machine.
- Perfect Fit: Precision-engineered to fit inside the dust canister of all Miele Boost CX1 bagless models.

- Miele Boost CX1 PowerLine (SN: 11640630)
- Miele Boost CX1 Cat & Dog PowerLine (SN: 11640600)
- Miele Boost CX1 Parquet PowerLine (SN: 11640590)
- All other Miele Boost CX1 Series