A Primary Air Handling Unit is a centralized HVAC unit that conditions and circulates air throughout a building or designated zone. It can process fresh outdoor air, return air or a controlled mixture of both.

An AHU system normally contains fans, filters, cooling coils, heating coils, dampers, mixing chambers and control components. Depending on the application, the unit may also contain HEPA filters, heat-recovery sections, humidifiers, dehumidification components and sound attenuators.

Zenvent Engineering supplies primary air handlers for chilled-water, direct-expansion, fresh-air, hygienic and specialized industrial HVAC applications.

A primary AHU performs several important functions within an HVAC installation.

Zenvent Engineering provides different air handling unit types according to the building layout and HVAC system requirements.

Available configurations include:

Our team evaluates the required airflow, cooling capacity, filtration level and installation area before recommending the appropriate configuration.

A double-skin air handling unit has inner and outer casing panels with insulation between them. This construction helps reduce thermal transfer, surface condensation, noise and vibration.

Zenvent Engineering provides modular double-skin AHU solutions for applications requiring durable construction, improved insulation and controlled internal conditions.

Double-skin units are commonly selected for:

A chilled-water air handling unit uses chilled water supplied by a central chiller plant. The chilled water circulates through the AHU cooling coil and removes heat from the passing air.

Our chilled-water air handling unit installation service includes:

Zenvent Engineering provides primary AHUs for chilled-water HVAC systems in commercial and industrial buildings.

A fresh-air AHU introduces outdoor air into a building after filtering and conditioning it. This supports ventilation and helps maintain appropriate indoor air quality.

A treated fresh-air unit, also called a TFA unit, can cool, heat, filter and dehumidify outdoor air before supplying it to occupied or controlled areas.

Zenvent Engineering provides fresh-air handling unit installation services for:

As a treated fresh-air unit manufacturer and supplier, we configure filtration, cooling and airflow according to the project requirements.

An indoor air handling unit is installed inside an AHU room, mechanical room, service area or ceiling space. The unit is protected from direct outdoor weather conditions.

An outdoor air handling unit requires weather-resistant construction, sealed panels and suitable external protection. It can be installed on terraces, rooftops or external service platforms.

Our team considers equipment access, drainage, service clearance, ventilation, structural support and duct routing when planning the AHU room or outdoor installation area.

A horizontal air handling unit arranges the internal components along a horizontal airflow path. This configuration is widely used in AHU rooms with adequate floor area.

A vertical air handling unit arranges the components within a vertical casing. It can be suitable for compact mechanical rooms and areas with limited floor space.

We select the equipment orientation according to:

An air handling unit fan must provide the required airflow while overcoming the static pressure created by filters, coils, dampers and ductwork.

A mixing chamber combines return air with fresh outdoor air before the air passes through the filters and coils.

The damper arrangement may include:

Motorized dampers can automatically adjust according to occupancy, indoor air quality, operating schedule or BMS commands.

Zenvent Engineering configures the mixing and damper sections to maintain the required ventilation rate and building pressure.

An energy-efficient primary air handling unit can use variable-speed components and automatic controls to match airflow with actual building demand.

Energy-efficient options include:

Our variable-air-volume AHU installation solutions adjust airflow according to changing requirements across different building zones.

Correct engineering calculations are essential for selecting an AHU unit.

Our design considerations include:

Zenvent Engineering performs airflow and cooling-load assessment before recommending an appropriate commercial or industrial air handler.

Zenvent Engineering provides professional air handling unit installation for new HVAC projects and existing system upgrades.

Our installation scope can include:

Our air handling unit testing and commissioning process verifies fan rotation, airflow, static pressure, coil operation, valve response, damper movement, drainage and control functionality.

Regular AHU service helps maintain airflow, filtration, cooling capacity and equipment reliability.

Zenvent Engineering provides air handling unit repair and maintenance services, including:

An annual maintenance contract for AHU systems can be arranged according to the number of units, operating schedule and maintenance requirements.

Zenvent Engineering provides commercial and industrial air handling systems for multiple sectors.

Zenvent Engineering delivers turnkey AHU supply and installation services for new buildings, facility expansions and existing HVAC upgrades.

Our team manages equipment selection, AHU installation, piping connections, duct coordination, controls, BMS integration, testing and final commissioning. We also provide ongoing maintenance, filter replacement, coil cleaning, fan repairs and system upgrades.

Contact Zenvent Engineering for commercial air handling unit installation services, industrial AHU design, chilled-water AHUs, fresh-air units, hygienic AHUs and customized primary air handling solutions.