Electrical Enclosure Pressurisation Systems Guide

Apr 29, 2026

Electrical enclosure pressurisation systems are designed to protect industrial electrical cabinets from dust ingress, internal heat buildup, and contamination-related electrical failure. In harsh site environments, filtered positive pressure airflow provides a cleaner, cooler, and more reliable operating environment for sensitive electrical components.

In this guide, we provide a general overview of what electrical enclosure pressurisation systems are, how they improve cabinet protection and electrical reliability, why more industrial sites are adopting them, and where they are commonly used.

Let’s dive in.

What Is an Electrical Enclosure Pressurisation System?

Electrical enclosure pressurisation systems are dedicated filtered airflow units fitted to electrical cabinets to actively control the environment inside the enclosure. Rather than relying solely on cabinet seals, these systems continuously introduce clean filtered air while maintaining stable internal pressure during operation.

This allows the enclosure to operate as a protected internal space, helping reduce the impact of airborne contamination and excessive heat on sensitive electrical hardware.

A Filtered Positive Pressure Protection System

The system works by drawing in ambient air through a high efficiency filtration assembly before supplying that air into the cabinet. Once inside, the filtered airflow creates slight positive pressure, meaning the cabinet pressure remains above the surrounding atmosphere.

Because air naturally wants to move outward through any small cabinet gaps, dusty external air is far less likely to leak inward. This simple pressure difference forms one of the most effective barriers against long-term contamination.

Common Electrical Cabinets Protected by These Systems

Electrical enclosure pressurisation systems are commonly installed on PLC cabinets, variable speed drive cabinets, motor control centres, automation panels, and remote field instrumentation enclosures.

These cabinets are often located close to conveyors, crushers, wash plants, diesel equipment, or process areas where dust and heat are constant operating challenges.

Electrical Enclosure Pressurisation Systems Improve Cabinet Protection

The biggest advantage of enclosure pressurisation is that it helps create a far more stable internal cabinet environment compared to passive sealed enclosures. Instead of allowing the cabinet to slowly absorb site contamination and trap internal heat, the system actively manages both cleanliness and airflow.

This leads to better long-term electrical reliability and reduced stress on internal components.

Reducing Dust Ingress and Airborne Contamination

Even cabinets that appear sealed can slowly draw in contaminated air through cable penetrations, worn seals, and maintenance openings as internal pressure changes throughout the day.

Positive pressure airflow changes that behavior completely by ensuring filtered air is always moving outward. This greatly reduces the amount of airborne dust, fine particulates, and moisture entering the cabinet over time, helping keep terminals, relays, boards, and drives cleaner.

Supporting Better Cooling for Sensitive Electrical Components

Modern electrical enclosures generate a significant amount of heat from PLC processors, relays, drives, transformers, and power supplies. Without controlled airflow, this heat can remain trapped and push internal temperatures beyond ideal operating levels.

Continuous filtered airflow helps remove that trapped heat and creates a more stable internal operating temperature, reducing thermal stress on sensitive electrical components and lowering the risk of nuisance trips or premature failures.

More Industrial Sites Adopting Electrical Enclosure Pressurisation

Industrial machinery is becoming increasingly dependent on electronic control systems, which means electrical cabinet reliability now has a direct impact on machine uptime.

As site environments become harsher and automation becomes more sensitive, many operations are recognising that standard cabinet sealing methods are no longer enough for long-term protection.

Electrical Cabinet Failures Lead to Expensive Downtime

When contamination or overheating causes electrical faults, the issue often extends beyond a single failed component. Machines may shut down unexpectedly, electricians are called out for troubleshooting, and production can be interrupted for hours or even days.

This makes cabinet protection a reliability issue as much as a maintenance issue.

Proactive Protection Is More Effective Than Reactive Repairs

Rather than waiting for contamination-related failures to occur, many sites are moving toward proactive enclosure protection to keep cabinets cleaner and cooler from the beginning.

Electrical enclosure pressurisation helps reduce the frequency of dust cleaning, electrical repairs, and heat-related component stress, making it a practical long-term upgrade for equipment operating in harsh environments.

Where Are Electrical Enclosure Pressurisation Systems Commonly Used?

Electrical enclosure pressurisation systems are used anywhere industrial electrical cabinets are exposed to airborne contamination, excessive heat, or unstable site conditions.

These systems are particularly valuable in operations where electrical reliability is critical to machine productivity.

High Dust Mining and Processing Environments

Mining operations, quarry plants, crushing systems, wash plants, and bulk handling facilities constantly generate fine airborne particulates that can slowly contaminate exposed electrical enclosures.

In these environments, maintaining positive pressure and filtered airflow helps create a far more reliable cabinet condition over long operating periods.

Remote Industrial Equipment and High Temperature Zones

Remote field automation stations, underground operations, smelters, and process areas often combine contamination risk with elevated ambient temperatures.

Electrical enclosure pressurisation provides both environmental protection and thermal airflow support, helping cabinets maintain cleaner and more stable operating conditions where standard sealed enclosures often struggle.

Keeping Underground Mining Safe with OnGuard!

Oct 14, 2025

Keeping Underground Mining Safe with OnGuard!

High-efficiency air filtration system with durable black filters and white PVC piping, designed for improved indoor air quality and ventilation in industrial and commercial facilities.

In underground activities, especially tunnelling and mining, dust exposure and poor air quality are critical health hazards. Limited ventilation, restricted air circulation, and the accumulation of carbon dioxide can quickly create unsafe working conditions for machine operators and crew members. To address these challenges, BreatheSafe designs and installs advanced filtration and pressurisation systems that provide operators with a clean, safe, and comfortable environment even in the harshest underground settings.

The Challenge of Underground Air Quality

Unlike open-air environments, underground worksites have very limited natural ventilation. Dust generated from drilling, cutting, and vehicle movement can remain suspended in the air for long periods.

At the same time, carbon dioxide produced by diesel engines, blasting activities, or human respiration can accumulate within enclosed spaces.

These conditions can cause a drop in oxygen concentration, increase operator fatigue, reduce visibility, and pose long-term respiratory risks. Maintaining air quality in such an environment requires a continuous and intelligent approach.

Industrial workers operating breathing-safe equipment in a manufacturing plant, promoting workplace respiratory safety and compliance with health standards.

Photo of BreatheSafe and Stairway inspecting the installation of an OnGuard system on a Tunnel Boring Machine.

How OnGuard Keeps Operators Protected

To ensure the safety of operators, BreatheSafe’s OnGuard air quality manager continuously monitors and manages air quality inside control rooms, break rooms, medical rooms, and offices.

The system automatically detects changes in pressure, carbon dioxide (CO₂), and dust levels, then reacts intelligently to any changes in air quality. It maintains positive pressure inside the room to prevent contaminated air from entering and logs air quality data for compliance and performance tracking.

This fully automated process allows operators to focus on their tasks while OnGuard maintains a stable and safe working environment without the need for manual adjustment.

Photo of one of the OnGuard systems on a Tunnel Boring Machine.

Custom Solutions for Demanding Conditions

Not only the RoomSafe system, but BreatheSafe also provides tailored solutions for underground machines, as well as electrical enclosures. Each system is custom-designed to meet specific site conditions or equipment requirements, ensuring optimal performance, safety, and reliability.

Whether it is protecting operators underground, safeguarding electrical components from dust and heat, or maintaining clean air in break rooms, BreatheSafe delivers integrated air quality solutions that enhance both safety and operational efficiency across all environments.

Operator Cabins – BreatheSafe System

What it does:
BreatheSafe system filters and pressurises air in mobile machinery like excavators, dozers, trucks, and drills.

Key features:

HEPA H14 filtration removes 99.995% of harmful dust (carbon filter optional for gas removal)
HEPA Panel Return Air Filter scrubs and filters the internal air
Positive pressure keeps contaminants out
Real-time monitoring of CO₂, PM2.5, airflow, and cabin pressure

Why it matters:
It protects machine operators at the source of exposure and helps your site meet safety standards for air quality.

BreatheSafe system fitted to a Sandvik Loader 517i

Electrical Enclosures – VoltAire System

What it does:
VoltAire protects sensitive electronics inside the enclosure by preventing dust ingress and heat build-up. This improves the reliability and longevity of critical electrical components.

Key features:

EPA E11 pressurisers filter incoming air.
Positive pressure prevents contaminated air from entering.
Automatically manages pressure and flushes out hot air when electronics begin to overheat.

Why it matters:
Electrical components are highly sensitive to heat and airborne contaminants. Reducing maintenance costs and extending equipment lifespan.

High voltage electrical safety equipment in industrial setting, featuring yellow control panels with warning labels and black electrical components.

VoltAire system fitted to a Caterpillar 796AC HV Cabinet

Our Commitment to Zero Exposure

At BreatheSafe, our mission is clear: Eliminate operator exposure to airborne contaminants. With the integration of OnGuard, we are helping create safer underground environments where operators can work confidently and efficiently, knowing their health and well-being are protected.

High-visibility workwear for industrial safety with respiratory protection at manufacturing plant in Australia.

Keep Your Operators Safe Everywhere

Air quality is not negotiable in the workplace. Dust, CO₂, and poor ventilation can put workers at serious risk and compromise the reliability of your equipment.

Get a Quote

BreatheSafe and Zamine Partnering to deliver cleaner air solutions at Perumin 2025

Sep 17, 2025

BreatheSafe and Zamine Partnering to deliver cleaner air solutions at Perumin 2025

Traducción al español

As BreatheSafe prepares to exhibit at Perumin, 22 – 26 September 2025, we sat down with Roberto Cárdenas, Dealer Manager Americas, to discuss our strong partnership with Zamine and what we’re most looking forward to at this year’s event.

Q: Can you talk us through the current partnership between BreatheSafe and Zamine?

Roberto: Zamine is an excellent partner for us because they share a strong focus on productivity. Their approach is all about increasing their customers’ performance and supporting them directly, not just serving their own interests.

That aligns perfectly with BreatheSafe’s mission. We are committed to protecting operators, improving air quality in the cabin, and ultimately enhancing mine productivity by reducing downtime through better maintenance, reliability, and availability of machines.

Zamine is highly respected in Peru and widely recognised across the mining sector. With their expertise, reach, and strong presence in the market, the partnership is a natural fit for us.

Q: What makes this partnership so valuable for customers in Peru?

Roberto: Zamine has outstanding technical capabilities and provides direct on-site support. This means that when customers choose BreatheSafe solutions, they also benefit from Zamine’s expertise. Their local team can help operators and maintenance crews maximize the value of our technology—ensuring clean air systems perform at their best and truly improve working conditions.

Together, we’re not only delivering advanced technology but also ensuring customers receive the technical support and expertise needed to get the most from it. This combination makes BreatheSafe and Zamine a powerful team for Peru’s mining industry.

Q: With Perumin 2025 coming up, what are you most excited about?

Roberto: Perumin will be the official launch of BreatheSafe in the Peruvian market, and that’s very exciting. It’s an incredible opportunity to showcase how our solutions can improve the working environment for operators underground and in open-pit operations.

We’ll be able to demonstrate to customers how they can measure, monitor, and rely on BreatheSafe technology for consistent results. This visibility is an important milestone as we expand into Latin America.

Q: What do you hope to get out of being at Perumin 2025?

Roberto: For me, the key is connecting with end users and really listening to their needs. Every mining market is different, and it’s vital to understand the local challenges. By engaging directly with operators and decision-makers in Peru, we’ll learn how BreatheSafe can best support them and tailor our solutions accordingly.

Ultimately, it’s about improving operations through cleaner air, healthier working environments, and higher productivity.

Catch BreatheSafe and Zamine at Perumin 2025 this September, and learn how we’re helping mining operators breathe easier while improving productivity across the industry.

Saving Lives in the Smoke: A New Approach to Firefighter Safety

Aug 26, 2025

Saving Lives in the Smoke: A New Approach to Firefighter Safety

Firefighters battle more than flames; smoke filled with toxins poses an invisible, long-term threat to their health. In this interview, BreatheSafe’s General Manager of Engineering and Product, Tommi Perkins, shares how innovations are helping protect those on the frontline.

Learn more about the high-temperature solution

Q: Tommi, wildfire fighting is one of the most demanding jobs in the world. From BreatheSafe’s perspective, what are the primary health challenges facing these professionals?

Tommi Perkins: Wildfire firefighters have an incredibly strenuous task, often working up to 24 hours straight in high-temperature and high-smoke conditions. For a long time, smoke from wood fires was presumed relatively safe, but research has proven this is not the case. The smoke contains a dangerous mix of gases and particulates, with studies identifying up to 31 carcinogens.

The challenge is that prolonged exposure to these fine particulates and gases, which is an industry given, causes significant and permanent lung damage. This can lead to cancers, COPD, and other serious respiratory illnesses. Many in the industry still believe they can’t burden firefighters with PPE because of the risk of overheating in a high-intensity, remote environment, but modern medical research is now highlighting the massive damage being done to firefighters’ lungs.

While wearing heavy PPE in the field can be impractical, we can still protect firefighters by creating a clean and safe breathing environment inside the enclosures of their vehicles and heavy machinery, where many are either operating or taking a moment’s respite.

Q: So, how does BreatheSafe’s general solution, used in mining and construction, translate to this unique environment?

Tommi Perkins: The approach is very similar. The solution is to protect the entire enclosure rather than just the person, and it’s a tried and tested method. We can isolate any enclosure from the outside air, like a dozer cab or a crew transport vehicle, by creating positive pressure inside. By delivering high volumes of purified, clean air into the space, the internal air is constantly pushed out. This ensures that none of the gases, dust, or ash from the outside environment can make its way into the enclosure.

The only way for air to get inside is through our filtration system. This creates a safe environment where firefighters can step in, take off their heavy gear, and cool down, confident that the air they are breathing is purified and safe.

Q: Firefighting poses some very specific risks that mining might not. What modifications or additions have you made to address the reality of flames, heat, and embers?

Tommi Perkins: You’re right, the threat of flying embers is a key concern. Our solution for firefighting equipment, such as dozers that are literally pushing burning trees, includes a spark arrestor and a pre-cleaner to extinguish embers and remove heavy ash and soot before it reaches the air filter. We also use heat-resistant and flame-retardant filters to ensure that the system can withstand high-temperature air.

Another critical modification we’ve made addresses the issue of heat. The last thing you want to do is introduce 176°F (80°C) air straight into the cabin onto an already hot and uncomfortable crew. We have designed a system that mixes the incoming air with the machine’s already cooled air from the air conditioning system before it passes through multiple stages of filtration. This ensures the air introduced is safe to breathe and also helps the firefighter cool down, as well as continuously filtering the air inside the cabin. The process of mixing and cooling the incoming air before it is moved into the enclosure is actually part of a patent-pending system.

Q: What about the types of vehicles and machinery used in firefighting? Can you provide solutions for all of them?

Tommi Perkins: Yes, we can. We have designed systems for a wide range of vehicles, from frontline dozers and fire engines with huge cabs to emergency crew transports and even light support vehicles. While a lot of fire equipment has sufficient excess power for our systems, a key challenge is that these vehicles are not built with adequate sealing, unlike modern mining equipment.

The industry is also poorly addressed right now. I’ve seen some existing proposed solutions, which filter the air in the space immediately around them, like a home room purifier, which means they’re only targeting air already inside the cabin and not necessarily in the breathing zone of the crew. There is nothing right now that provides a comprehensive solution. Our unique approach of filtering all incoming air and then mixing it with the air inside the cabin is something no one else has done yet.

Wildfire smoke is a silent threat to firefighters’ health. BreatheSafe’s cabin protection systems provide clean, cooled air and a safe space to recover—so our frontline heroes can keep breathing safely.

Lung Diseases in Heavy Industries: COPD, Silicosis, and More

Jun 12, 2025

Lung Diseases in Heavy Industries: COPD, Silicosis, and More

Patient visits doctor at the hospital. Concept of medical healthcare and doctor staff service.

What Are Occupational Lung Diseases?

In heavy industries like mining, construction, and manufacturing, some of the most serious health risks aren’t always visible, and that’s exactly why they’re often ignored. Dust, diesel particulates, and microscopic contaminants may be out of sight, but their long-term impact on lung health is severe and irreversible.

From COPD and silicosis to black lung and progressive massive fibrosis, these diseases can develop silently over years of exposure. By the time symptoms appear, the damage is often permanent.

This article examines the most prevalent lung diseases affecting industrial workers, the symptoms to look out for, and how BreatheSafe’s filtration and pressurisation systems help prevent exposure before it occurs.

Chronic Obstructive Pulmonary Disease (COPD)

Causes narrowing and inflammation of airways, and damages air sacs (alveoli), making it difficult to breathe out.

Symptoms include:

Persistent cough with mucus
Shortness of breath during physical activity
Wheezing or chest tightness

Long-term exposure to fine dust, fumes, and diesel particulates is a major cause in industrial settings.

Silicosis

Caused by inhaling fine crystalline silica dust, commonly found in rock, sand, concrete, and mine dust. Leads to scarring (fibrosis) of lung tissue due to inhaled silica dust, which reduces lung capacity over time.

Symptoms include:

Persistent cough
Chest pain
Shortness of breath

In advanced cases, it may develop into Progressive Massive Fibrosis (PMF), a severe and debilitating condition marked by large scarring of lung tissue.

8.-_Miner's_lung_with_silicosis_and_tuberculosis

Miner’s lung with silicosis and tuberculosis (Basque Museum of the History of Medicine and Science, Spain)

By Museomed – Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=12223787

Black Lung Disease (Coal Workers’ Pneumoconiosis)

Results from long-term inhalation of coal dust and cause the accumulation of coal dust in the lungs, triggering chronic inflammation and fibrosis.

Symptoms include:

Chronic coughing
Breathlessness
Lung scarring

Can progress to Progressive Massive Fibrosis (PMF) in severe or prolonged cases.

Progressive Massive Fibrosis (PMF)

An advanced stage of silicosis or black lung that causes large, severe scars to form in the lungs, leading to major breathing impairment.

Symptoms:

Severe, permanent shortness of breath
Reduced lung capacity
Poor quality of life and limited treatment options

PMF is not a standalone exposure disease but a complication of advanced dust diseases.

Lung slice from a coal worker, showing black pigmentation and fibrotic scarring caused by prolonged inhalation of coal dust and silica particles.

Dr. Yale Rosen, https://www.flickr.com/photos/pulmonary_pathology/5187845054/, CC BY-SA

How to Actively Prevent Lung Disease?

Preventing lung disease in industrial environments starts with clean air. Using high-efficiency filtration systems like HEPA H14, maintaining positive pressure in cabins and rooms, and monitoring air quality in real time are key steps. These measures help reduce workers’ exposure to harmful dust and gases, lowering the risk of long-term conditions such as COPD, silicosis, and black lung.

Operator Cabins – BreatheSafe System

What it does:
BreatheSafe system filters and pressurises air in mobile machinery like excavators, dozers, trucks, and drills.

Key features:

HEPA H14 filtration removes 99.995% of harmful dust (carbon filter optional for gas removal)
HEPA Panel Return Air Filter scrubs and filters the internal air
Positive pressure keeps contaminants out
Real-time monitoring of CO₂, PM2.5, airflow, and cabin pressure

Why it matters:
It protects machine operators at the source of exposure and helps your site meet safety standards for air quality.

BreatheSafe system fitted to a JCB loader 436HT

Enclosed Workspaces – RoomSafe System

What it does:
RoomSafe protects crib rooms, control rooms, and workshops from harmful dust and gases.

Key features:

HEPA H14 pressuriser filters incoming air (optional carbon module for gas removal)
Positive pressure prevents contaminated air from entering
Power HEPA recirculation filter captures internal dust and improves airflow.

Why it matters:
RoomSafe creates a clean-air zone where workers can safely rest, work, and recover — even in high-dust environments.

RoomSafe system fitted to a TBM control room

Conclusion: Dust Is Invisible — But the Risk Isn’t

Diseases like COPD, silicosis, black lung, and progressive massive fibrosis develop over time, often with no early symptoms. But by the time they’re diagnosed, the damage is often permanent. Fitting a proper air filtration and pressurisation system is one of the most effective ways to reduce workers’ exposure to harmful dust and airborne contaminants. When combined with real-time air quality monitoring and regular maintenance, these systems help create safer breathing environments, whether in machine cabins or enclosed workspaces. This not only protects worker health but also helps sites comply with modern occupational air quality standards.

BreatheSafe Dual HEPA filtration system

RoomSafe Dual HEPA filtration system

Comparing Cabin Filtration Systems: What is the BEST?

Apr 7, 2025

Comparing Cabin Filtration Systems: What is the BEST?

In high-risk industrial environments such as mining, tunnelling, construction, and heavy machinery operation, airborne contaminants like respirable dust, diesel particulates, and chemical vapours pose serious threats to operator health and safety. In such conditions, cabin filtration systems must go far beyond the basic requirements of HVAC.

This article explores the three common cabin filtration system types: Open Circuit, Closed-Circuit Dual HEPA, and Closed-Circuit Tri HEPA. It explains why only Closed-Circuit systems should be considered for effective cabin protection.

What Makes a Cabin Filtration System Effective?

An efficient cabin air filtration system must achieve more than particle removal inside the cabin. It must function as an integrated system that delivers:

✅ HEPA filtration (≥99.95% efficiency at 0.3 microns) for both fresh and recirculated air

✅ Closed-Circuit air filtration, ensuring all cabin air, both incoming and recirculating, is filtered

✅ Positive pressure maintenance to prevent unfiltered air from entering

✅ Sealed integration with HVAC systems to ensure air quality and operator comfort are not compromised

These are not optional features—they are the foundation of compliance, operator health, and operational uptime.

1. Open Circuit Filtration – Not Recommended

An open circuit filtration system relies on the OEM HVAC filter for recirculating air inside the cabin, which usually features a low-grade cabin filter, not capable of removing fine respirable particles.

This creates a partial protection scenario, where fresh air is filtered to HEPA standard, but recirculated air is not. In dusty environments, this results in the accumulation of contaminants inside the cabin, compromising air quality over time.

The image shows the recirculated air filter from a dozer.

❌ Recirculated air bypasses the OEM filter

❌ Unfiltered internal dust builds up and re-enters the breathing zone

❌ Operator exposure increases with time, even if fresh air is clean

❌ Not compliant in high-risk or regulated environments

2. Closed-Circuit Dual HEPA Filtration

A closed circuit dual HEPA system filters both the incoming fresh air and the recirculated cabin air through independent HEPA filters. This creates a fully sealed, controlled environment where all air the operator breathes is continuously cleaned.

✅ HEPA filtration on all air pathways, fresh and recirculated air

✅ Dual HEPA stages improve system and filter longevity

✅ Maintains positive pressure to prevent ingress of contaminated air

✅ Continuously purifies internal air by scrubbing the cabin air

3. Closed-Circuit Tri HEPA Filtration

Tri HEPA systems take the closed-loop design further, using three stages of HEPA filtration to ensure maximum protection, longer filter life, and redundancy. Often paired with gas-phase filtration, CO₂ monitoring, and advanced sealing, these systems are built for critical-risk environments where safety is non-negotiable.

✅ Triple HEPA filtration layers reduce decay time

✅ Optimised filter loading, extends the recirculation filter’s life

✅ Proven best for extreme dust working environments

Choosing the Right Cabin Filtration System

System Type	Fresh Air	Recirculated Air	Recommended for Air Filtration System?
Open Circuit	✅ Yes	❌ No (uses OEM low-grade filter)	❌ Not recommended for any condition
Closed-Circuit Dual HEPA	✅ Yes (HEPA H14)	✅ Yes (HEPA H13)	✅ Yes (for most conditions)
Closed-Circuit Tri HEPA	✅ Yes (HEPA H14)	✅ Yes (HEPA H13 & H14)	✅ Yes (for extreme conditions)

Final Thoughts

The effectiveness of a cabin filtration system is not just in what it filters—but in how completely it isolates and treats the air within the operator’s breathing space. Systems that filter only the incoming air while neglecting recirculated air are inherently flawed, especially in environments where fine particulate or toxic exposure is constant.

For any serious industrial application, Closed-Circuit HEPA filtration—dual or tri-stage—is not just recommended, it is essential. Don’t leave operator health and compliance up to chance. If your current setup still relies on Open Circuit design, it’s time to reassess.

BreatheSafe offers engineered solutions tailored to real-world conditions, ensuring that every breath your operator takes is as clean as possible.

Contact Us

Additional Resource

How BreatheSafe replaces OEM filters to deliver superior operator protection.