3-Stage Breathing Air Filter Regulator Sets (EN12021 Ready)
Oil-free, odour-free compressed air for spray booths and breathing air lines.
3-stage filtration removes moisture, oil mist and contaminants for clean, reliable air.
UK stock available — order by 16:00 for FREE next-day delivery.
Our three-stage kit delivers dry, oil-free, odour free air for spray booths, hood/visor lines and maintenance stations, backed by real test reports and our trademark attention to detail.
Why Choose Our 3-Stage Breathing Air Filter Sets?
- Removes oil, water & odours
- Silicone-free – ideal for paint spraying
- Visual filter status indicators
- Lockable regulator (0.5–10 bar)
- Fully assembled & pressure tested
- UK stock → next-day delivery
Important Breathing Air Safety Information
This 3-stage system removes particles, oil mist, moisture and odours, but it does not remove carbon monoxide (CO) or carbon dioxide (CO₂).
Breathing air compliance depends on:
- Compressor intake air quality
- Correct breathing-air hose (EN standards)
- Regular maintenance and filter replacement
- Periodic air-quality testing
HOW THE 3 STAGES WORK
How the 3-Stage Filtration System Works
Stage 1: 5µ Pre-Filter + Regulator
Removes larger particles, rust, dirt and up to 90% of water.
Includes pressure regulation for stable downstream air supply.
Stage 2: 0.01µ Coalescing Filter (RED)
Removes fine oil mist, aerosols and micro-particles.
Protects both equipment and breathing air quality.
Stage 3: Activated Carbon Filter (GREEN)
Removes oil vapours and odours, delivering clean, neutral-smelling air.
Together, these three stages deliver ultra-clean compressed air suitable for demanding industrial applications.
Typical Applications
- Spray booths and automotive body shops
- Breathing air supply lines
- Manufacturing and assembly stations
- Inspection, cleaning and maintenance areas
- Any application requiring clean, odour-free compressed air
Tested Performance & Air Quality Results
Independent UK Testing (EN12021)
Independently tested by a UK air systems specialist.
Results show compliance with EN12021 air quality targets when properly maintained.
Verified Results (Example)
- Oxygen: 20.7%
- CO: 0 ppm
- CO₂: within limits
- Oil mist: pass
- Dew point: within acceptable range
- Factory Flow Testing
Each unit is factory-tested for flow performance under controlled conditions.
Typical outputs exceed 2000 L/min depending on model size.
Verified Flow Performance (from factory test report)
“Independently Verified Results (UK Test)”
| Model | Port Size | Flow Rate | Max Flow Rate | Inlet Pressure | Outlet Pressure | Test Temperature |
|---|---|---|---|---|---|---|
| UFR02B-UMF02B-UMF02KB | ¼ BSP | 2057 L/min (≈ 123 m³/h) | 2104 L/min (≈ 126 m³/h) | 7.15 kg/cm² (≈ 7 bar) | 0.37 kg/cm² (≈ 0.36 bar) | +24.8 °C |
| UFR04B-UMF04B-UMF04KB | ½ BSP | 2237 L/min (≈ 134 m³/h) | 2238 L/min (≈ 134 m³/h) | 7.72 kg/cm² (≈ 7.6 bar) | 0.40 kg/cm² (≈ 0.39 bar) | +22.7 °C |
1. Factory Flow-Rate Certification
Each assembly is factory-tested by Shako Co Ltd under controlled conditions.
At 7 bar inlet pressure and outlet drop of 0.4 bar, the maximum clean-air flow is confirmed as:
¼″ BSP: ≈ 2057 L/min (123 m³/h)
½″ BSP: ≈ 2237 L/min (134 m³/h)
Certification dated August 2020, witnessed by Connexion Developments Ltd (UK Reg No 03502257).
Independent Breathing-Air Quality Testing
Real-world testing August 2025 carried out by Griffin Air Systems Ltd, Clydebank (UK), on installed Connexion Developments 3-stage breathing-air filter regulator sets.
Recent sample reports show results comfortably within the BS EN 12021:2014 breathing-air quality limits:
| Parameter | EN 12021 Limit | Griffin Air Result (Example) |
|---|---|---|
| O₂ Content % | 20–22 % | 20.7 % |
| CO₂ (ppm) | ≤ 500 ppm | 325 ppm |
| CO (ppm) | ≤ 5 ppm | 0 ppm |
| Oil Mist mg/m³ | ≤ 0.5 mg/m³ | Pass |
| Dew Point | ≤ −11 °C (typical) | −8 °C |
| Pressure (bar) | 6–8 bar typical | 6.3 bar |
| Result | Pass | Pass |
Tests performed 29 August 2025 at McKinnon & Forbes Ltd, Paisley, verified by Griffin Air Systems (UK test report ref: PM10145/002).
Breathing Air Certificate ↓ PDF
Technical Specifications
Keep structured, not long text:
- Port sizes: 1/4″ to 1″ BSP (NPT available)
- Pressure range: 0.5–10 bar
- Max pressure: 15 bar
- Temperature: 0°C to +60°C
- Materials: Aluminium body, polycarbonate bowls with guards
- Drain: Semi-auto (manual optional)
What’s Included
- Pressure regulator with gauge
- 5µ pre-filter
- 0.01µ coalescing filter (RED)
- Activated carbon filter (GREEN)
- Mounting brackets and fixings
- Bowl guards and fittings
- Instructions
Maintenance & Filter Replacement
Recommended Replacement Intervals
- Pre-filter: 6–12 months
- Coalescing: 6–12 months
- Carbon: 3–6 months
Simple Maintenance Process
- Isolate air supply
- Remove bowl
- Replace element
- Reassemble and test
Pro Tip
Keep spare filter elements in stock to avoid downtime.
Compliance & Best Practice
Designed to support compliance with:
- EN12021 breathing air standards
- HSE compressed air guidance
Final compliance depends on system setup and regular testing.
Breathing Air Filters → View Range
FAQs
Q: Does this set make my air “EN 12021 compliant” automatically?
It’s designed to help you meet typical limits, but true compliance depends on your whole system and must be confirmed by testing.
Q: How often should we test?
At least every three months, and after any change in risk (new paints/solvents, compressor service, element changes).
Q: When should I change the carbon element?
Every 3–6 months as a rule of thumb or immediately if any smell/odour breaks through.
Q: Are polycarbonate bowls safe near solvents?
Solvent vapours can attack polycarbonate. Where present, specify the acid/alkali-resistant bowls.
Q: Can you supply NPT threads?
Yes — specify at checkout or contact our team.
Q: Does the system remove CO2 and Carbon Monoxide?
No, this filter system DOES NOT REMOVE CO2 or CO
Q: Can I use normal airline for breathing Air?
No, you must use hose according to European standard of ‘REGULATION (EU) 2016/425 - personal protective equipment' SS-EN 14594: Respiratory protective devices and SS-EN 14593-1: Respiratory protective devices - Requirements, testing and marking.
Q: What compressor is required for breathing air systems?
An oil-free compressor is preferred, but the most important factor is the quality of the intake air.
Install compressors in clean, dry environments away from dust, fumes and moisture to reduce contamination.
Cleaner intake air extends filter life and improves overall air quality.
High-demand applications, such as spray booths, may require higher flow capacity to maintain consistent performance.
Attention to Detail — Built In
From bowl guards and lockable regulators to readily available spares, every component is specified for reliability and ease of maintenance.
Spares, Always Ready
Keep operations running: RED coalescing, GREEN carbon and 5 µm elements are stocked for same-day dispatch.
Compliance Statement
All Connexion 3-stage breathing-air assemblies are built, tested and supported to help users maintain breathing-air quality consistent with BS EN 12021:2014 and HSE guidance on compressed-air systems.
Regular quarterly testing and filter-element maintenance are essential to ensure continued compliance.