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

Part Number Upgrade Notice: 47701891001 is Ingersoll Rand's official upgrade number for the older 39903281. Installation dimensions, filtration efficiency, and service life are identical — the two are fully interchangeable. Please order using the new number 47701891001.

Product Information

Specifications

Dimension Note: Outer diameter, inner diameter, and height are measured reference values. Original manufacturing tolerance ±2 mm. Some batches are marked with a height of 180 mm. Verify physical part before installation.

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

Need 100% accurate fit? Provide the complete machine serial number and we can verify for you.

Price & Lead Time

Bulk inquiries welcome. Worldwide shipping available.

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This part number has been officially superseded by 47701891001. Installation dimensions, filtration efficiency, and service life are identical — direct interchange without any mounting modifications.

The element uses imported wood pulp filter paper / fiberglass composite media (Ahlstrom-grade), with filtration efficiency of 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 compressor rotor while avoiding excessive pressure drop that increases energy consumption.

Outer diameter ≈ 380 mm, inner diameter ≈ 199 mm, height ≈ 178 mm, net weight ≈ 1.75 kg per element. One element per compressor. Recommended replacement: 2000 hours or 1 year, whichever comes first.

Installation & Maintenance

Replacement Interval

OEM recommendation: 2000 hours or 1 year, whichever comes first. In dusty environments (dusty workshops, construction sites), shorten inspection intervals to monthly.

Signs Replacement Is Needed

• Inlet restriction indicator enters the yellow zone and remains there after shutdown;
• Dust traces visible on the clean side of the filter housing;
• Discharge volume continuously decreases with no other fault found.

Do Not Clean and Reuse

Dry pleated elements cannot 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 loosen the filter housing cover;
3. Grip the end cap and remove the old element;
4. Inspect the housing interior — if dust traces are on the clean side, the seal has failed and must be addressed before installing the new element;
5. Wipe the sealing surface, insert the new element (inner diameter ≈199 mm aligned with the intake port), and avoid over-tightening;
6. Reinstall the housing cover and confirm the restriction indicator returns to the clean position;
7. Restart the unit and verify inlet restriction has returned to normal.

Old and new numbers are directly interchangeable: 47701891001 and 39903281 share identical installation dimensions. No housing replacement or structural modification is needed — install directly following the steps above.

FAQ

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

Q2. Are 39903281 and 47701891001 interchangeable?
Yes. Installation dimensions, filtration efficiency, and service life are identical — fully interchangeable.

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 efficiency 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 / fiberglass composite media. Original uses Ahlstrom-grade media for high dust holding capacity and low flow resistance.

Q6. Which compressors does 39903281 fit?
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: 2000 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 to replace the air filter?
When the inlet 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 compatibility with my machine?
Provide the complete compressor serial number and we can perform an accurate compatibility check.

Inquiry

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

For a fast, accurate quote, please provide:

• Compressor model (e.g., S110, RM185n)
• Or complete machine serial number (for 100% accurate compatibility verification)
• Required quantity

We will respond during business hours.