Ingersoll Rand 47701891001 Air Filter Element | Replaces 39903281 | 380mm OD for S90–S150, M185, RM185

⚠️ Part number update notice
47701891001 is the official Ingersoll Rand upgrade for the older 39903281.
Both share identical mounting dimensions, filtration performance, and service life, and are directly interchangeable.
Please order using the new number 47701891001.

1. Product information

2. Specifications

Dimensional note: Outer diameter, inner diameter, and height are measured reference values. OEM manufacturing tolerance is ±2 mm; some batches are marked 180 mm in height. Verify against the physical part before installation.

3. Compatible Ingersoll Rand models

S Series — SSR S Series oil-injected screw compressors (90–150 kW)

M Series — SSR M Series oil-injected screw compressors

RM Series — RM Series screw compressors (185 kW)

Total compatible models: 6 — S90, S110, S150, M185, RM185i, RM185n.
These are classic Ingersoll Rand industrial oil-injected screw compressors in the medium-to-high power range.

Need 100% exact match?
Provide the complete compressor serial number and we can verify for you.

4. Pricing and lead time

Bulk inquiries welcome. Worldwide shipping available.

5. Product overview

39903281 is the air filter element used in Ingersoll Rand SSR S Series, M Series, and RM Series screw compressors.

This part number has been officially upgraded and replaced by 47701891001. Both share identical mounting dimensions, filtration performance, and service life, and are directly interchangeable without any modification to the installation structure.

The element uses imported wood pulp filter paper / glass fiber composite media (Ahlstrom-grade), with filtration rating 5–10 μm and ≥98% efficiency for particles above 5 μm. It combines high dust holding capacity with low flow resistance — effectively trapping dust to protect the main rotor while avoiding excessive resistance that drives up energy consumption.

Outer diameter ≈ 380 mm, inner diameter ≈ 199 mm, height ≈ 178 mm, net weight ≈ 1.75 kg per element. Each compressor uses 1 element. Recommended replacement: 2,000 hours or 1 year, whichever comes first.

6. Installation and maintenance

Replacement interval

OEM recommendation: 2,000 hours or 1 year, whichever comes first.
In dusty environments (dusty workshops, construction sites), shorten inspection intervals to once per month.

Signs replacement is needed

• Air intake restriction indicator enters the yellow zone and remains there after shutdown;
• Dust traces visible on the clean side of the filter housing;
• Discharge volume continues to drop after other causes have been ruled out.

Do not clean and reuse

Dry pleated elements must not be washed or blown with air — cleaning damages the pleat structure and reduces filtration efficiency. Replace with a new element.

Installation steps

1. Shut down and lock out/tag out; allow the enclosure to cool.
2. Open the intake-side enclosure panel and release the filter housing cover.
3. Grip the end cap and remove the old element.
4. Inspect the housing interior — if dust traces are present on the clean side, the seal has failed and must be addressed before installing a new element.
5. Wipe the sealing surface, install the new element (align the ≈199 mm inner diameter with the air inlet), and avoid over-tightening.
6. Reinstall the housing cover and confirm the restriction indicator returns to the clean position.
7. Restart the unit and confirm intake restriction returns to normal.

Old and new numbers are directly interchangeable: 47701891001 and 39903281 share identical mounting dimensions. No housing change or structural modification is required — simply install following the steps above.

7. Frequently asked questions

Q1. What is the new part number for 39903281?
47701891001. It is the official Ingersoll Rand upgrade for the older 39903281.

Q2. Are 39903281 and 47701891001 interchangeable?
Yes. Both share identical mounting dimensions, filtration performance, and service life, and can be used interchangeably.

Q3. What are the dimensions of 39903281?
Outer diameter ≈ 380 mm, inner diameter ≈ 199 mm, height ≈ 178 mm (including top and bottom polyurethane end caps). Outer diameter manufacturing tolerance ±2 mm.

Q4. What is the filtration rating of 39903281?
5–10 μm, with ≥98% efficiency for particles above 5 μm.

Q5. What filter media does 39903281 use?
Imported wood pulp filter paper / glass fiber composite, with OEM Ahlstrom-grade media; high dust holding capacity, low flow resistance.

Q6. Which compressors does 39903281 fit?
It fits 6 models: SSR S Series S90, S110, S150; M Series M185; and RM Series RM185i, RM185n.

Q7. What is the difference between RM185i and RM185n?
i is fixed speed; n is variable speed. Both use the same air filter.

Q8. How often should this air filter be replaced?
OEM recommendation: 2,000 hours or 1 year, whichever comes first. Shorten intervals in dusty environments.

Q9. How many air filters are needed per compressor?
1.

Q10. How do I know when the air filter needs replacement?
The intake restriction indicator turns yellow and remains in the yellow zone after shutdown.

Q11. Can 39903281 be cleaned and reused?
No. Dry pleated elements cannot be washed or blown with air; cleaning damages the pleat structure and reduces filtration efficiency.

Q12. How can I confirm it fits my machine?
Provide the complete compressor serial number and we can perform an exact match verification.

8. Inquiry

Bulk purchasing, export documentation, and worldwide shipping are available.

For a fast and accurate quote, please provide:

• Compressor model (e.g., S110, RM185n)
• Or the complete compressor serial number (for 100% exact match verification)
• Required quantity

We will respond during business hours.