Air Handling Units, Fan Coil Units & Heat Recovery Systems for Critical Australian HVAC-R Projects

G J Walker Air Handling Systems is a specialist Australian manufacturer of air handling units (AHUs), fan coil units (FCUs), coils and heat-recovery systems for commercial and mission-critical HVAC-R applications.

Established in 1975, G J Walker has spent 50 years supplying engineered air-handling solutions to hospitals, laboratories, universities, Defence, data centres, pharmaceuticals, government buildings and major commercial developments across Australia.

G J Walker designs AHUs to AS/NZS 3666 and manufactures to EN 1886 construction standards, with hygiene performance independently tested to VDI 6022 by TÜV. Selected models align with AHRI and Eurovent certification pathways for performance and energy.

For consulting engineers, mechanical contractors and FM teams, G J Walker offers a local, standards-aligned, Australian-made platform for airside plant — from central AHUs and heat-recovery units to FCUs and replacement coils.

Air Handling Units

G J Walker manufactures Australia’s most established AHU ranges — refined over five decades for performance, hygiene, durability and compliance.

1. ASH Series – Horizontal AHUs (Flagship Range)

Designed for hospitals, universities, data centres and commercial buildings.

Features include:

• Double-skin galvanised construction
• 50–100 mm insulation: PU, PIR or XFLAM EPS
• Chilled-water, DX or glycol coils
• Steam or hot-water heating coils
• AS 3666-compliant stainless steel drain trays
• EC or AC plug fans or belt driven fans
• Full AHRI-certified unit performance (selected models)

2. ASV Series – Vertical AHUs

Ideal where plantroom or riser constraints require a vertical configuration.

3. AM Series – Multizone AHUs

For projects requiring multiple temperature or pressure zones from a single plant.

• Multiple-section configurable casing

Technical Brochures

AHU Technical Brochure (PDF):
https://jellyfish-orange-2bnp.squarespace.com/s/031_GJ-Walker-AHU-Brochure_v13.pdf

This brochure details casing classes, leakage classes, hygiene features, fan selections, coil options and access/maintenance design for specification writing.

Fan Coil Units – Ducted FCUs with EC Fan Options & Stock Availability

FCU Page: https://www.gjwalker.com.au/fan-coil-units

G J Walker manufactures ducted FCUs for Australian commercial conditions, with a focus on low-profile height, high static performance, low noise, and EC fan energy efficiency.

FCU Family Highlights

CFP – Low-Profile Ceiling Concealed FCUs

• High-static, low-profile
• Three-speed or EC fan options
• Ideal for commercial tenancy fit-outs and building upgrades

CMLH / CMDH – High-Capacity Horizontal FCUs

• Shallow ceiling void design
• Direct-drive fans
• Widely used in universities, hospitals and commercial towers

Vertical & Custom FCUs – ALEC, CMLV, CFF Series

• Vertical or horizontal configurations

FCU Stock On Hand:
https://www.gjwalker.com.au/stock-on-hand

CMLH/CMDH Catalogue (PDF):
https://jellyfish-orange-2bnp.squarespace.com/s/CMLH-_-CMDH-catalogue.pdf

Coils – Chilled Water, Hot Water & DX Coils

Coils Page: https://www.gjwalker.com.au/coils

G J Walker manufactures:

• Chilled-water coils
• Hot-water coils
• DX evaporator coils
• Custom retrofit/replacement coils

Features:

• Tube sizes: 3/8″, 1/2″, 5/8″
• All coils nitrogen-charged & sealed to maintain internal cleanliness
• Made for both new plant and upgrade/replacement projects

This simplifies the work of engineers and contractors needing exact-matching replacement coils or integrating coils into custom AHUs.

Heat Recovery – Eurovent-Certified Heat Wheels

Heat Recovery Page:
https://www.gjwalker.com.au/heat-recovery

G J Walker supplies Eurovent-certified heat-recovery wheels, supporting:

• Latent & sensible energy recovery
• Hospital & laboratory exhaust/supply systems
• Commercial IAQ improvement
• Rooftop and indoor plantroom installations

These wheels are suitable for offices, healthcare, laboratories, universities and high-ventilation buildings.

 

Key Applications – Hospitals, Cleanrooms, Defence, Universities & Critical Facilities

G J Walker’s systems support:

• Hospitals & medical facilities
• Pharmaceutical and cleanroom environments
• Defence and government buildings
• University laboratories
• Data centres
• Art galleries, museums & archives

These projects require AS 3666 hygiene, maintainable design, reliable coils, high-efficiency heat recovery, and long-term local support.

Resources for Designers, Contractors & FM Teams

Downloads: https://www.gjwalker.com.au/downloads
Includes:

• AHU technical brochures
• AHU Installation & Operation Manuals
• FCU brochures (ALEC, CMLH/CMDH)
• Coil specifications
• Wiring diagrams and data sheets

Spare Parts:
https://www.gjwalker.com.au/spare-parts

FM teams benefit from clear documentation, spare parts access and long-term manufacturer support.

Why Engineers, Contractors & FM Teams Choose G J Walker

Consulting Engineers

• Australian-made AHUs & FCUs with AS 3666, EN 1886, VDI 6022, AHRI/Eurovent alignment
• Deep technical documentation for specifications and scheduling
• Proven track record on hospitals, universities and critical facilities

Mechanical Contractors

• National footprint with reliable local support
• Robust, durable AHU/FCU construction
• EC fan selections for energy-efficient upgrades
• Stock units available for fast-track projects

Facilities Managers

• Hygienic, maintainable AHUs with proper access & drainage
• Long-term parts support
• Energy-efficient FCUs and heat-recovery options for sustainability goals