01924 253509

Our team of experienced industry experts can provide a wide range of services across the UK. With our diverse fan and air handling unit knowledge, we are a perfect option for all your on-site refurbishment and maintenance requirements.

Highest possible efficiency

Highest possible efficiency

We believe that the correct service, maintenance and refurbishment of HVAC plant is critical to ensure that the ventilation system operates to the highest possible efficiency levels.

Technical expertise

Technical expertise

We can review all your existing air handling and filtration requirements to provide a solution to ensure that the system operates at peak energy performance.

Excellent service

Excellent service

Each project is handled with the utmost professionalism and our distinctive personalised hands on approach ensure an excellent service is carried out in a friendly and outgoing manner.

High quality performance

High quality performance

Our clients often find our services have not only helped to provide them with a higher quality performing system but also provided large cost savings on energy consumption.

High Efficiency Fan Upgrades

Our team can refurbish various types of fans for different applications. These include changing belt driven centrifugal fans to high efficiency plug fans (AC and EC versions). By removing old inefficient belt driven fans and replacing with the latest direct driven EC or AC fan technology, large energy savings can be achieved.

We can advise on the cost saving benefits of carrying out such a change. We can also advise on the range of speed control options available to ensure the highest possible energy efficiency system.

AHU Maintenance

Our team are able to maintain all of your existing AHU’s. As manufacturers and installers of AHU’s we have vast experience amongst the team to enable us to provide maintenance solutions to a wide range of potential scenarios. All systems are different and our team would provide a tailor made solution to suit your exacting requirements.

This can include but not be limited to:

  • Regular filter changes
  • Repair / replacement of gauges and controls devices
  • Mechanical and electrical inspection of fans & motors
  • Repair / replacement of components
  • Cleaning of internal components and casework
  • Check & repair leaking AHU panels and casework
  • Diagnosis of system faults and problems

AHU Installation

We are able to provide installation services for all manufacturers and types of AHU’s.

Contact our team for further details.

Flat Pack AHU Installation

Flat pack installations are a speciality and we have completed many installations throughout the UK.

Our own manufactured equipment is designed to fit through the specific available access, delivered to site, positioned and fully assembled by our own engineers.

As well as the casework all parts can also be broken down including fans, coils and heat recovery devices.

Our specialist flat pack installation team have fitted units into the tightest near impossible locations.

The option to have a flat pack AHU is often as a result of limiting space restrictions however it can also be a cheaper option than cranage in certain applications.

We are able to provide flat pack installation services for all manufacturers and types of AHU’s.

Contact our team for further details.

Comprehensive Site Surveys

Our team can attend site to advise on any issues relating to AHU’s. Whether it be feasibility to what can be achieved with a new system, changes to an existing system or problems relating to the performance of a current system our team are always happy to help.

Full AHU Condition Reports

Our site services team can provide a full condition survey on your existing AHU plant.

Typically, we would cover the following areas during a condition survey on an AHU.

Casework: Check all internal and external casework for corrosion. Check all panels for air leakage. Check all panels for ingress of rain water. Check rain roofs are correctly allowing water to run from the top of the AHU and not allowing rain water to form puddles.

Louvres / cowls: Check for integrity and ensuring they are fit for purpose.

Dampers: Ensure they operate smoothly and correctly and check functional properties of the damper actuators where fitted.

Filters: Check for condition of the filters and the filter slide frames / casework. Check for evidence of incoming rain water possibly damaging the filters due to high velocities on the AHU inlet. Check for damage / wear to the filter slide frames or mechanisms deployed for holding of the filters.

Fans / Motors: Check mechanical and electrical properties. Check impellors turn freely and there are no signs of bearing damage. Check the anti-vibration mountings and flexible connections for signs of wear / damage.

Coils: Check the coil fins for any signs of blockages. Inspect the coil fins (particularly frost coils) for any crumbling of the fins. Check condition of the pipework for any previous signs of leakage. Inspect drain trays and traps.

Thermal wheels: Ensure there are no mechanical defects with the thermal wheel. Check to ensure no damage has been caused to the wheel matrix and check for signs of blockages (particularly on systems that have had poorly maintained filters as dirty air may have passed through the unit into the wheel matrix). Check the speed controller functions correctly.

Plate heat exchangers: Visibly check for any possible damage to the heat exchanger surfaces and structure. Check for signs of blockages (particularly on systems that have had poorly maintained filters as dirty air may have passed through the unit into the heat exchanger matrix). Check that the by-pass damper turns freely and observe the condition of the by-pass damper.

AHU Refurbishment

Can the AHU be refurbished?

Following a visit by one of our site services team a report would be issued detailing the feasibility of refurbishing the AHU with an explanation of the recommended works to bring the AHU to a standard to suit a particular requirement or budget.

Why refurbish?

Due to a poor quality AHU or failing components or a requirement to improve the specification of the existing plant.

They say you need a new AHU but do you really?

The old rusting unit on the roof is assumed to be beyond repair and no longer fit for purpose. Often this decision is made for some of the following reasons:

Corrosion of the casework. This can be remedied. Various techniques can be used to vastly improve the casework appearance and mechanical properties.

Low / insufficient airflow. This can be remedied. Factors such as blocked coils, closed dampers and blocked louvres can contribute towards this. Inefficient fans and incorrectly operating controls are often also major culprits.

Unable to maintain the correct temperatures. This can be remedied. As previous, plus draughts allowed to enter the building during system downtime can be a big issue.

Prior to throwing it in the bin! Think! Can it be refurbished?

Benefits of refurbishing

Our team have carried out refurbishment works on many different AHU manufacturers units. These works have included the fitting of new components, casework repair and modifications.

There are several major benefits of choosing to refurbish an existing AHU including:

Cost & practicality

If deciding whether to replace or refurbish an AHU cost savings to be considered include:

  • Saving on new ductwork installation
  • Saving on new pipework installation
  • Fitting the latest high efficiency technology components provides significantly improved running costs and greater reliability.
  • Cost savings on future maintenance as the new components will be considerably more reliable and require less maintenance time in future years (e.g belts and bearings).
  • No requirement for cranage in some cases that would be required to replace with a new unit.
  • Maintain the existing space. New equipment due to legislative differences in the time from installation of the existing unit to the requirements for a new system would invariably need to be significantly larger and take up more space on site.
  • Save on time between refurbishment and a typical new installation.
  • Vastly improves the life time of the AHU often in excess of 15 years.

Our team can provide detailed guidance on the best way forward when a client is deciding whether to renew or refurbish. Sometimes the best solution is to partially refurb and partially renew. Typically some AHU sections do not stand the test of time as well as others and it may be that a particular section can be removed and replaced.

Energy savings

By removing old inefficient belt driven fans and replacing with the latest direct driven EC or AC fan technology large energy savings can be achieved. We can advise on the cost saving benefits of carrying out such a change. We can also advise on the range of speed control options available to ensure the highest possible energy efficiency system.

Replacing or cleaning blocked coils will result in a much lower pressure drop which in result will improve air flows and reduce energy consumption.

Air quality

By changing blocked filters and damaged filter slide frames / casework which often allow dirty air to by-pass the filters significantly improved air quality levels will be achieved.

Increasing the specification

There may be a requirement to change a LPHW coil to electric or gas or a change in the cooling coil specification. The AHU may require an additional section fitting such as an additional heating or humidifier device. Our site services team are able to advice on all such issues.

Refurbishing of an AHU

Following the issue of a condition report our team would forward a quotation detailing a full list of the recommended / requested works. Often we provide a ‘shopping list’ of what options are available.

We can typically summarise our refurbishment options into three categories Level 1Level 2 and Level 3.

For a Level 1 option we would typically clean the unit of surface dirt, fit new gaskets / doors as required and replace any critical or failing components. For this option the AHU would not always look vastly different but would operate more efficiently. We often have clients who say that they need to keep a unit operating for a certain period of time such as two years and need it to operate more efficiently.

On a completed project at a major engineering company, we attended site and replaced all access panels, gaskets, fitted new damper actuators and new belts and pulleys. The client was extremely pleased with the results and actually commented their thought process in terms of timescales for providing new equipment may now be reviewed. It is our belief that for not an excessive amount of outlay some fairly significant differences can be made to the airflow performance and energy efficiency of the system.

For a Level 2 option we would do everything detailed within the Level 1 option. We would tend to replace the majority of the components, particularly the fans. The casework would be treated and repaired. For this option the AHU would look significantly different internally and externally and from a functionality perspective a major difference would be noticeable.

For a Level 3 option the AHU would be taken back to the outer shell. All internal casework would be re-built, all components would be renewed. The internal and external casework fully treated and fitted with new panels where possible and painted to match where not possible.


Our team are able to replace faulty controls parts and fit inverters / other controls devices to many different existing AHU’s.