Fresh outdoor air is essential for maintaining indoor air quality, process cleanliness and controlled room conditions. However, untreated outdoor air can contain dust, fine particles, humidity, microorganisms, odours and gaseous contaminants.

A hygienic fresh air system treats outdoor air before supplying it to the occupied or process area. The air may pass through multiple filtration stages, cooling coils, heating coils, dehumidification sections, UVGI air treatment and heat-recovery equipment.

Zenvent Engineering develops filtered fresh air systems for applications where standard ventilation is not sufficient.

Our hygienic fresh air solutions are designed to support:

Each solution is developed according to the building layout, process requirements, outdoor-air conditions and required indoor environmental parameters.

A process fresh air system provides treated outdoor air according to the environmental requirements of an industrial or manufacturing process.

The system may control:

A process air handler may operate as a standalone unit or as part of a larger process HVAC system.

Zenvent Engineering designs process air handling systems for manufacturing facilities where uncontrolled outdoor air could affect production quality, equipment operation or process stability.

Our customised process air solutions can be developed for:

Controlled spaces require a consistent supply of treated outdoor air to maintain the required operating conditions.

Fresh air helps:

In pharmaceutical, healthcare and food-processing environments, untreated fresh air can introduce particles and microorganisms into sensitive areas.

Zenvent Engineering designs conditioned fresh air systems that treat outdoor air before it enters the controlled space.

A hygienic AHU is specially designed for clean and controlled applications.

A standard AHU may not provide the internal finish, drainage, sealing and cleanability required for hygienic environments.

A hygienic air handler may feature:

Zenvent Engineering provides hygienic air handling units for cleanrooms, pharmaceutical plants, hospitals, laboratories and food-processing facilities.

Our services include hygienic AHU selection, installation, testing, commissioning and maintenance.

A 100% fresh air unit processes outdoor air without mixing it with return air.

This arrangement is suitable for applications where return-air recirculation is restricted or undesirable.

Common applications include:

A 100% fresh air handling unit may include cooling, heating, dehumidification, HEPA filtration and heat recovery.

Zenvent Engineering provides 100% fresh air handling unit installation according to the required airflow, outdoor-air condition and indoor environmental parameters.

An outdoor air handling unit is designed to treat fresh outdoor air before supplying it to occupied or process spaces.

The unit may be installed:

Outdoor units require suitable weather protection, corrosion resistance, insulation and drainage.

Zenvent Engineering designs outdoor air handling units according to climate conditions, airflow requirements, filtration stages and project specifications.

A process air handling system is developed around the specific needs of a manufacturing or controlled process.

Unlike general comfort air conditioning, process HVAC focuses on maintaining conditions required for production, storage or equipment operation.

A process fresh air system may control:

Zenvent Engineering provides process air handling systems for manufacturing facilities with customised coil selection, filtration, controls and airflow arrangements.

A fresh air intake filter reduces the entry of outdoor dust and debris into an HVAC system.

Depending on the application, the intake arrangement may include:

An HVAC fresh air intake filter must be selected according to outdoor-air quality, airflow volume and fan capacity.

Zenvent Engineering provides filtered fresh air intake systems for residential, commercial and industrial applications.

UVGI air treatment uses germicidal ultraviolet energy to support microbial control inside the fresh air system.

UVGI equipment may be installed:

UVGI air treatment can support:

UVGI does not replace air filters. It is used together with suitable particle filtration.

Zenvent Engineering designs UVGI air-treatment arrangements according to airflow velocity, lamp output, exposure time and installation position.

Humidity control is essential in many pharmaceutical, laboratory, food-processing and manufacturing applications.

Excessive humidity can contribute to:

Low humidity can also affect sensitive processes, products and occupants.

A humidity-control system may include:

Zenvent Engineering selects humidity-control equipment according to the required room conditions and outdoor moisture load.

A positive-pressure system supplies more filtered air than the amount removed from the room.

This creates outward airflow when doors or openings are used, helping reduce the entry of contaminants from surrounding spaces.

Positive-pressure ventilation is commonly used for:

Zenvent Engineering provides positive-pressure fresh air systems for cleanrooms with suitable airflow control, filtration and pressure monitoring.

Differential pressure control maintains a planned pressure relationship between adjoining rooms.

A room differential pressure control system may include:

Maintaining the correct pressure gradient helps control airflow direction and reduce cross-contamination.

Zenvent Engineering designs pressure-control arrangements for cleanrooms, pharmaceutical facilities, hospitals and laboratories.

Heat-recovery ventilation transfers thermal energy between exhaust air and incoming fresh air.

A fresh air heat-recovery unit can reduce the heating or cooling load required to condition outdoor air.

Heat-recovery technologies may include:

An HRV fresh air system is commonly used when energy recovery is required without significant moisture transfer.

Zenvent Engineering selects heat-recovery equipment according to airflow, exhaust-air quality and cross-contamination requirements.

A fresh air heat exchanger transfers energy between supply and exhaust air without directly mixing the two air streams.

Benefits can include:

Zenvent Engineering integrates air-to-air heat exchangers with fresh air units, treated fresh air units and commercial ventilation systems.

A washable hygienic air handling unit is designed to support internal cleaning and inspection.

Important construction features include:

Washable hygienic panels help reduce areas where dirt, moisture and microorganisms can accumulate.

Condensation inside an AHU can support corrosion and microbial growth.

Zenvent Engineering considers the following during hygienic system design:

Proper drainage and internal construction help prevent standing water inside the air handling unit.

A successful fresh air system must coordinate filtration, temperature, humidity, pressure, airflow and energy performance.

Zenvent Engineering considers:

Each system is developed to suit the building, process and operating environment.

Zenvent Engineering provides turnkey hygienic fresh air system installation for new construction, renovations and HVAC upgrades.

Our installation services may include:

Each installation is coordinated with the architectural, electrical, plumbing and process requirements.

Hygienic AHU testing and commissioning verify that the equipment and controls operate according to the project requirements.

Commissioning may include:

Zenvent Engineering documents the operating parameters required for stable system performance.

A BMS-integrated fresh air unit allows central monitoring and control of system performance.

The BMS may monitor:

A BMS-integrated process fresh air system can support reliable operation, fault detection and maintenance planning.

Regular maintenance is necessary to maintain airflow, filtration efficiency and hygienic conditions.

Zenvent Engineering provides fresh air system maintenance for:

Maintenance activities may include:

A fresh air system for a home introduces filtered outdoor air while removing stale indoor air.

Residential options may include:

A clean air ventilation system can improve air circulation in tightly sealed houses where natural ventilation is limited.

Zenvent Engineering can design residential ventilation according to house size, occupancy, duct availability and local climate conditions.

Basements can experience stale air, odours, moisture and limited natural ventilation.

A basement fresh air system may include:

The airflow must be balanced to improve ventilation without creating uncontrolled moisture problems.

Industrial ventilation systems control heat, fumes, dust, odours and process-generated contaminants.

A process ventilation system for industrial facilities may combine:

Zenvent Engineering designs industrial ventilation systems according to process conditions and contaminant sources.

Food-processing facilities require fresh air systems that support cleanliness, temperature control and contamination prevention.

Zenvent Engineering provides:

The system design considers process heat, moisture, exhaust requirements and hygienic cleaning procedures.

A laboratory ventilation system must manage fresh air, exhaust air, fumes and room pressure.

Zenvent Engineering provides:

Laboratory airflow is designed to support containment and prevent contaminated air from moving into adjoining areas.

Zenvent Engineering provides hygienic and process fresh air systems for a wide range of applications.