Our AHUsWhat types of air handling units do we offer?We deliver a varied and diverse range of Air Handling Units (AHUs) developed to meet your specific needs. The below will give you a flavour of the types of air handling units that we can offer you.Our air handling units are delivered in various case sizes with airflow from 0.2m³/s to 50m³/s. As you would expect, the larger the flow rate required, the larger the case size but we always aim to deliver maximum system output from the smallest possible footprint whilst providing adequate space for maintenance.We operate with a 'less-is-more' ideology and always strive to manufacture the most compact AHU we can given the required design parameters. This makes them ideal for indoor installation (internal installation) and for outdoor applications (external installation) where space is tight and of paramount importance. AHU unit configurationsWhether you require indoor or outdoor AHUs, side-by-side or stacked AHUs, roof or floor-mounted AHUs we can assist.

Configuration is no worry to us and as long as specified at initial tender, we can adapt and develop your air handling unit accordingly.AHU components / optionsBelt drive fan section with optional run and standby facility or motors external to the air streamDirect drive fan section (plenum or centrifugal type, EC or high efficiency AC, PM motor option)Maintenance access, air diffusion space, turning plenumsAttenuationParticulate filtration (panel, bag, rigid)Carbon filtration for odours and contaminantsHigh efficiency particulate air filter Heating coil (water/steam)Cooling coil (water/DX gas)Electric heaterIndirect and direct gas heaterSteam humidifier (direct steam or self-generating – electrode boiler, resistive, gas)Modulating or shut off damperMixing/exhaust boxPlate heat exchanger (with or without bypass for free cooling) can be aluminium, coated aluminium, plastic, etc.Thermal wheel (sensible, hygroscopic, desiccant, enthalpy)Heat pipeRun around coilsInlet/Outlet with ducted connection/louvre/hood/acoustic louvreAdiabatic cooling or humidificationIntegrated controlsN+1 redundancyAcoustically and thermally insulated casing as standard, with further acoustic and thermal optionsFully welded galvanised steel box section frame work as standard, stainless steel and aluminium optionsInterior lighting and viewing optionsRaised or specially designed base frame optionsFixed (but accessible) or removable drain tray options in galvanised or stainless steelNon standard colours availablePitched roof as standard on externally

mounted air handling unitsIntegrated air to air heat pump for cooling or reverse cycle operationFully packaged ‘plug and play’ optionAHUs with complete flexibilityA choice of configurations is offered to give real operating flexibility to suit different applications and operator preference throughout all of our air handling units.Our Enviropack™ R410A refrigeration package is available throughout all our air handling units, providing the option for cooling (10kW – 235kW) and heating (9kW – 218kW). Available in single and dual circuits, Enviropack™ delivers up to 4 stages of cooling or heating across multiple skid platforms. A single control panel manages both the refrigeration package and the AHU. Contact our AHU sales engineers for further informationThe definition of air handling unit from ANSI/AHRI Standard 430-2009 states that it is "A factory-made encased assembly consisting of a fan or fans and other necessary equipment to perform one or more of the functions of circulating, cleaning, heating, cooling, humidifying, dehumidifying and mixing of air...."The AHU is used to control the following parameters of the space.

There are basically two types of air handling unit that are in used and they are the "Draw-Through" or "Blow-Through". In the Draw-Through type, the fan pulls the air through the mixing box, filters and cooling coil before discharging it from the fan outlet to the space to be conditioned or to the ducting network. The design can be vertical or horizontal. In this case, the section before the fan has negative pressure.cost of hvac repairIn the Blow-Through type, the fan blows the air through the mixing box, filters and cooling coil before discharging them to the space being conditioned or the ducting system. electric heating cooling wall unitsIn this case, the section after the fan has positive pressure.how to reset a home ac unit An air handling unit where (1) is the supply air,  (2) fan section, (3) vibration isolator, (4) cooling coil, (5) filter and (6) mixed air duct.

Components of Air Handling UnitHere are some of the air handling unit components that may be contained in the equipment.The housing that contains all the other components of an AHU is usually make of metal, some are painted to prevent corrosion.In sections where the fans and the coil are located, 1-2 inches of polyurethane foam or PU is used to insulate them to prevent the condensation on the panel. Drain pan is also used as a precaution in the event of condensation of water.Centrifugal fan is used to circulate the air to the various parts of the sections in the building. The typical types of fan available are Backward Inclined, Backward Curved, Forward Curved and Airfoil.The selection of the fan will depend on the air volume and the static pressure required of the system. Usually, the designer of the system will use a specialized software to do this selection. In order to reduce the effect of vibration on the panel, the motor and the fan are usually installed on the vibration isolator except when the drive assembly is external to the fan casing.

In recent years, the use of variable air volume (VAV) system is becoming more popular as the volume of the air being discharged can be varied depending on the load condition. If the load is high, the fan speed will be higher and if the load is lower, the speed of the fan will be lower. The speed of the fan is varied by using frequency inverter instead of conventional motor such as PSC motor. Frequency inverter provides better control of the fan speed as a whole range of fan speed from super low to super high can now be utilized based on the load conditions required. This technology has enabled better use of energy and is in tandem with the move to go for greener energy.Cooling Coil is used to cool and dehumidify the air. Both DX (direct expansion) cooling and CW (chilled water) cooling coils are available for use depending on the system design. These coils are arranged in rows with different fin spacing. Aluminium fins and copper tubes are used in the design of the coils. The corrosion resistance hydrophilic fins are also used due to its lower cost and lower resistance to the air velocity.

Filters are to remove particles and contaminants of various sizes from the air. The type of air filter being used will very much depend on the application of the system.Panel Filter is a flat and rectangular in shape and provides a minimum low efficiency filtration which is acceptable to the air conditioning industry. The high velocity filter is arranged vertically whereas the low velocity filter is arranged in V shape. Typical air velocity that moves through the filters is in the range of 2-3 m/s.HEPA Filter is very efficient and is able to achieve efficiencies up to 99.97%, removing minute particles and airborne bacteria from the air. It is usually used in clean room applications such as semiconductor production floor, operating theaters and critical processes.Electrostatic Filter is used to remove particles from the air by using highly charged electrodes that ionized the air. Bag Filter is able to remove dust particles and is thrown away after use. Roll Filter is used for high velocity filtration where the used part is rolled up automatically/manually.