CNWINNEX ATEX Certified Explosion Proof Combined Air Handling Unit, Modular Explosion-Proof AHU for Hazardous Areas

Product Overview

The explosion-proof combined air handling unit (AHU) is the core air treatment equipment in HVAC systems. It is designed for industrial sites where explosive atmospheres of IIA, IIB, IIC groups and temperature classes T1~T4 may exist.

Manufactured in compliance with ATEX Directive 2014/34/EU and EN 60079 explosion protection standards, this unit is ATEX Certified. Explosion-proof marking: Ex db ib mb IIC T4 Gb, suitable for Zone 1 and Zone 2 hazardous locations. All electrical components, fans and control circuits are fully explosion-proof protected to eliminate potential ignition sources. Complete explosion-proof documentation is available for HSE review and site acceptance for global chemical, oil & gas projects.

The unit adopts a modular design with single or multiple functional sections. Optional sections include fresh & return air mixing section, pre & medium efficiency filter section, fresh air & exhaust section, intermediate (maintenance) section, secondary return air section, cooling coil section, heating section, water spray section, silencer section, humidification section, flow equalizing section, supply/return fan section and air outlet section. Customers can select and combine sections according to project requirements. The modular structure enables flexible configuration and easy disassembly & maintenance. Custom non-standard design and manufacturing are available for diverse industrial applications.

Key Features

1. Low investment with high performance

Lower upfront capital cost while delivering excellent ventilation and heat transfer performance.

2. Low power consumption & low operational cost

Low electricity consumption to cut running cost. For the same area, the evaporative explosion-proof air conditioner consumes around 1/8 power of central air conditioning, with power consumption of only about 1 kWh per hour.

3. Long air supply distance & large airflow

Airflow can reach above 18,000 m³/h with long throwing distance, suitable for large workshop ventilation.

4. Excellent air purification

Integrated ventilation, air exchange, purification and odour removal. It exhausts odorous, dusty and hot stale indoor air and brings in fresh outdoor air. Filtration efficiency for dust particles larger than 1μm reaches over 80%.

5. Effective & fast cooling

Achieves temperature drop of 4℃–10℃ with rapid cooling response to relieve high temperature in workshops.

Functional Section Introduction

- Pre-filter section: Non-woven panel pre-filter, capturing large particles in fresh air, protecting the unit and reducing load on medium filters.

- Medium filter section: Non-woven bag filter, removing secondary dust generated inside ducts and the AHU to improve supply air cleanliness.

- Fan section: Low-noise centrifugal explosion-proof fan with high static pressure and low sound level. Variable frequency explosion-proof control is optional upon request.

- Cooling coil section: Face velocity ≤2.5 m/s. Hydrophilic flat fin coils deliver high heat transfer efficiency, resist dust accumulation and bacterial growth, and prevent water carry-over.

- Heating section: Hot water, steam or electric heating available. Electric heating adopts smooth stainless steel tubes without fins, featuring good corrosion resistance, low dust accumulation and easy cleaning.

- Humidification section: Dry steam humidification optional. No residual water inside the humidifier after shutdown to avoid bacterial growth.

- Sterilization option: UV or ozone generator can be equipped to sterilize air inside the unit and inhibit bacterial growth.

Typical Applications

Chemical plants, oil & gas workshops, hazardous material workshops, pharmaceutical explosion-proof workshops, energy storage plants, paint booths, Zone1 / Zone2 hazardous areas with ⅡA/ⅡB/ⅡC T1~T4 explosive atmospheres.