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. Both share identical mounting dimensions, filtration accuracy, and service life, and are fully interchangeable. Please order using the new number 47701891001.

Product Overview

The 39903281 air filter element is used on Ingersoll Rand SSR S Series, M Series, and RM Series screw air compressors. This part number has been officially superseded by 47701891001. The two are completely interchangeable—same mounting dimensions, same filtration accuracy, same service life—with no modification to any installation structure required.

The element uses imported wood pulp filter paper / glass fiber composite media (Ahlstrom grade), delivering 5–10 μm filtration accuracy 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 pressure drop 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.

Specifications

• Old part number: 39903281
• New part number: 47701891001 (official upgrade, direct interchange)
• Part type: Air Filter Element (dry pleated cartridge)
• Brand: Ingersoll Rand
• Outer diameter: ≈380 mm (max OD of filter body; factory tolerance ±2 mm)
• Inner diameter: ≈199 mm (center mounting bore, matches compressor intake)
• Height: ≈178 mm (including top and bottom polyurethane end caps; some batches marked 180 mm)
• Filtration accuracy: 5–10 μm; ≥98% efficiency for particles above 5 μm
• Media: Imported wood pulp filter paper / glass fiber composite (Ahlstrom grade)
• Weight: ≈1.75 kg net per element (slight variation between batches)
• Quantity per compressor: 1 element
• Recommended replacement interval: 2,000 hours or 1 year, whichever comes first
• New/old interchangeability: Fully interchangeable

Dimensional note: OD, ID, and height are measured reference values. Factory tolerance ±2 mm; some batches are marked 180 mm in height. Please verify against the physical part before installation.

Compatible Ingersoll Rand Models

SSR S Series (oil-flooded screw compressors, 90–150 kW): S90 (90 kW), S110 (110 kW), S150 (150 kW).

SSR M Series (oil-flooded screw compressors): M185 (185 kW).

RM Series (screw compressors, 185 kW): RM185i (i = fixed-speed), RM185n (n = variable-speed).

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

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

Price & Lead Time

• Old number 39903281: superseded; no longer in normal supply
• New number 47701891001: normally available; reference price ¥1,240; quoted price ¥1,419; lead time 45 days
• Unit: EA (each)

Bulk inquiries welcome. Global shipping available.

Installation & Maintenance

Replacement Interval

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

Signs Replacement Is Needed

• 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 with no other fault cause.

Do Not Clean and Reuse

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

Installation Steps

1. Shut down and lock out/tag out; wait for 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 appear on the clean side, the seal has failed and must be addressed before installing the new element.
5. Wipe the sealing surface and install the new element (align the ≈199 mm ID with the intake). Do not over-tighten.
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.

Direct interchange: 47701891001 and 39903281 share identical mounting dimensions. No housing change or structural modification is needed—simply install 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. They share identical mounting dimensions, filtration accuracy, and service life, and are directly interchangeable.

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

Q4. What is the filtration accuracy 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 media, Ahlstrom grade, with high dust-holding capacity and low flow resistance.

Q6. Which compressors does 39903281 fit?
Six 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 the fixed-speed version, n is the variable-speed version. Both use the same air filter.

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

Q9. How many air filters does one compressor need?
1 element.

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 air-blown—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 a precise match verification.

Request a Quote

We support bulk procurement, export documentation, and global shipping.

To quote quickly and accurately, please provide:

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

We will respond during business hours.