ZERN ENGINEERING heat exchangers

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Enthalpy Hygiene Certification VDI 6022

Enthalpy Hygiene Certification VDI 6022

We are excited to announce that our enthalpy plate heat exchangers have officially obtained hygiene certification in line with VDI 6022, highlighting our ongoing commitment to safe, efficient, and sustainable ventilation technology.

🔍 Why is VDI 6022 important?

This European standard is among the most rigorous frameworks for HVAC hygiene. It establishes strict criteria for design, material selection, and cleanability — ensuring that ventilation components can be safely used in sensitive facilities such as healthcare centers, laboratories, educational institutions, and public buildings.

🧪 Internationally recognized hygiene compliance

Our EC-EX6 series has been tested and confirmed to meet multiple standards, including:

✅ VDI 3803, sheet 1 (05/2020)

✅ DIN 1946, part 4 (09/2018)

✅ ÖNORM H 6020 (03/2024)

✅ ÖNORM H 6021 (01/2023)

✅ SWKI VA104-01 (01/2019)

✅ SWKI VA105-01 (08/2015)

📐 Benefits of certified enthalpy exchangers

With the ability to transfer both temperature and moisture, EC-EX6 exchangers create balanced indoor climates while maximizing energy efficiency. Certification guarantees that these advantages are delivered under strict hygiene and safety requirements.

♻️ Clean air as a principle

For us, certification is not just a milestone — it is a proof of our philosophy: innovation with responsibility. By achieving this recognition, ZERN ENGINEERING continues to support healthier, more sustainable building environments.

🔗 Discover more: Hygiene Test Certificate ZERN HU_HC_HS_HD_EC-EX6_EN.pdf

Effective energy recovery starts with ZERN ENGINEERING🔋

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Pool & fitness ventilation – Managing humidity and comfort 🏊

Pool & fitness ventilation – Managing humidity and comfort 🏊

Indoor swimming pools and fitness centers are among the most challenging environments for ventilation systems.

💦 High water evaporation, constant temperature differences, and intense human activity create extreme humidity and corrosive air conditions.

Without proper air management, these factors lead to:

Uncomfortable indoor climate
Condensation on walls, ceilings, and windows
Corrosion of metal structures and equipment
Growth of mold and harmful microorganisms

That’s why a well-designed Air Handling Unit (AHU) with efficient heat recovery is essential.

The role of the heat exchanger in pool & fitness ventilation

In every high-performance AHU, the heat exchanger is at the heart of the system.

Its function is to recover energy from the warm, humid exhaust air and transfer it to the incoming fresh air — without mixing the two streams. This allows the system to:

1. Reduce heating or cooling energy consumption

2. Maintain stable indoor temperature

3. Control humidity levels

4. Ensure fresh, healthy air supply

ZERN ENGINEERING solution for aggressive environments

For swimming pools, spas, and high-humidity fitness centers, we developed a special series of counter-flow air-to-air heat exchangers designed to withstand aggressive conditions:

🪙 Casing – corrosion-resistant aluminum with gold epoxy coating, providing long-term protection against chlorinated and saline air.

📄 Heat transfer plates – made of high-quality polystyrene (PS), ensuring high thermal efficiency and complete immunity to rust.

♻️ Counterflow design – maximizes temperature efficiency, delivering superior energy savings even in demanding operating modes.

⚙️ Durability & reliability – engineered for continuous operation in humid and chemically aggressive environments.

Why it matters for pools & fitness facilities

1. Energy efficiency – lower heating and cooling costs, even with large fresh air volumes.

2. Comfort – stable temperatures and optimal humidity for users.

3. Building protection – prevention of condensation and structural damage.

4. Hygiene – minimized risk of mold, bacteria, and unpleasant odors.

With ZERN ENGINEERING heat exchangers, you get more than just ventilation — you get climate stability, lower operational costs, and extended system lifetime.

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🌫 Combating mold and excess moisture with proper ventilation

🌫 Combating mold and excess moisture with proper ventilation

Excess humidity is one of the most common and underestimated problems in buildings. It often starts unnoticed: steamed-up windows, damp corners, or a musty smell. But over time, it leads to:

1. Black mold on walls and ceilings

2. Peeling paint, damaged insulation and furniture

3. Worsening of asthma, allergies, and respiratory symptoms

4. Health risks due to mold spores and mycotoxins

5. Structural degradation and increased renovation costs

📉 Studies show that relative humidity above 60% indoors creates the ideal environment for mold growth and microbial activity.

Why does moisture build up?

In modern, airtight buildings, moisture has nowhere to go.

Activities like cooking, showering, breathing, and even drying clothes indoors generate liters of water vapor every day.

If there’s no proper ventilation – the air becomes stagnant, and humidity accumulates in corners, behind furniture, and in cold zones.

The solution – balanced mechanical ventilation

To control humidity, ventilation must do more than just supply fresh air — it must remove excess moisture continuously, even in winter.

That’s where heat recovery ventilation (HRV/ERV) with a well-designed heat exchanger becomes essential:

✅ Constant airflow — stale, humid air out; fresh, filtered air in

✅ No need to open windows or lose heat

✅ Controlled indoor climate without condensation

✅ Prevention of mold, dampness, and allergens

How ZERN ENGINEERING heat exchangers help?

At ZERN ENGINEERING, we design air-to-air heat exchangers that actively support moisture control in every type of building:

🔷 Sensible plate exchangers

Keep airflows completely separate — ideal for bathrooms, kitchens, and bedrooms where hygiene is key.

They prevent condensation by maintaining proper air exchange without energy waste.

🔷 Rotary heat exchangers

In enthalpy and sorption versions, they recover both heat and moisture — balancing indoor humidity in dry seasons, while still preventing excess buildup.

In condensation versions, they focus purely on heat — useful in damp or high-load environments.

🔷 Enthalpy plate exchangers (membrane-based)

Allow vapor transfer while keeping gases, odors, and microbes separate.

Perfect for residential, educational, and healthcare environments where both comfort and hygiene matter.

✔️ VDI 6022 compliant

Don’t wait for mold to show up

Mold doesn’t need a flood — just still air and hidden humidity.

A proper heat recovery ventilation system with the right heat exchanger ensures:

✅ Clean, dry air

✅ No condensation

✅ Long-term protection for your building and health

📩 Contact ZERN ENGINEERING to select the right heat exchanger to keep humidity under control — all year round.