Armstrong Fluid Technology

Our unique expertise in fluid flow, heat transfer, variable speed and demand-based control allows you to choose from a single-source, highly integrated line of HVAC and fluid flow products and services. Whether you are in need of individual equipment, a packaged solution, or a complete installation engineered to your specifications, we can craft the cutting edge outcomes you expect.

Regions serviced for this principal
North West, Yorkshire, North East, North Wales

External Contact
Ken O’Donoughue
Paul Phillips

Internal Contact
Lindsey Sankey

Arrow Valves

Dose & Fill

Dose & Fill has been developed to combat the growing costs and problems associated with heating systems starved of inhibitor. Modern systems frequently have aluminium heat exchangers, steel panel radiators & thin copper tubing, requiring adequate levels of inhibitor to avoid perforations, blockages and to validate the manufacturers’ warranties.

Traditionally a system is manually dosed via a dosing pot after the initial fill. However this is diluted every time the pressurisation unit adds plain water following normal minor losses or after partial draining for maintenance. The Dose & Fill incorporates the Arrow Valves Midi-Fill Digital pressurisation unit, whilst the lower half of the 1 m tall enclosure contains a 20 litre chemical container.

In “auto dosing” mode, the unit monitors the quantity of water added by the pressurisation unit and then the dosing pumps automatically inject chemical to the heating system according to concentration set via the LCD digital display.


“Midi-Fill” Digital has been designed to comply with the Water Regulations, providing Fluid Category 5 backflow protection for filling and top-up of “non-house” heating or chilled systems. Filling loops with a Double Check Valve must no longer be used for non-house primary circuits – see Water Regulations. “Midi-Fill” Digital is compact and intended for wall mounting.


Autofill AFS is a new type of pressurisation unit for filling “non-house” heating or chilled water systems. Filling loops with a Double Check Valve must no longer be used for non-house primary circuits – see Water Regulations.

Autofill replaces traditional pressurisation units and requires no tank or pump (except model AFP, which has a booster pump). Autofill is exceptionally compact at just 300 mm square.

The unit complies with the new Water Regulations for both filling and pressurising the primary system.

Regions serviced for this principal
North West, Yorkshire, North East, Scotland, North Wales, West Midlands

External Contact
Paul Phillips

Internal Contact
Julie Cairns

Fraser Engineering (UK) LTD

Perimeter Heating

Front panels and mullions are manufactured from 1.2mm Zintec material and finished in polyester powder paint, to an approved colour and gloss level. Unit dimensions can be configured to match your requirements, with panel heights from 150mm upwards and unit depths from 60mm. End caps and internal/external corners are available, similarly manufactured and finished. Wall brackets are manufactured from 2.0mm Zintec with integral element supports. All parts are finished in matt black self etch paint. Heating elements can be L.P.H.W. (hot water) or electric.Grilles available include continuous punched aluminium, (with the option of a variable slide damper with rotary control) manufactured from 6063 T6 aluminium and anodised AA5 as standard. These grilles can be supplied in a variety of anodised finishes or can be powder coated with your choice of standard RAL colour and gloss level.Cable trays can be incorporated into the design to accomodate various services including computer cabling and mains power distribution with outlet sockets. Each cable tray comes complete with a return edge for cable retention, joining plates and earth-continuity joiners.

Trench Heating

Fraser Engineering (UK) Ltd manufactures L.T.U.® trench heating products. The link below shows some typical casing dimensions, but as each project is purpose made, changes can be made to the width or depth of the trench as required.Trench casing assemblies, including element supports are manufactured from 1.2mm Zintec. The casing interior is finished in matt black self-etch paint.Levelling of the casing is achieved by use of M6 x 50mm hex headed screws through M6 wide flange ‘Nutserts’.Heating elements can be L.P.H.W. (hot water) or electric. Fan assisted units are available where more output is required.The elements sit on supports within the trench, which are faced with a ‘U’ shaped rubber extrusion to prevent any noise caused by expansion or contraction.Grilles to finish trench heating can be manufactured to suit almost any requirement. The best way to see the wide range of grilles available is to visit the Grilles page.The edge trim supports the grille and is manufactured from 6063 T6 grade aluminium, usually anodised AA5 to BS1615. Heavy duty stainless steel grilles utilise a linished stainless steel A304 angle. End of runs are finished with a welded open frame, pre drilled for fixing.

Fraser Engineering Trench and Perimeter Heating Brochure 2014

Radiant Panels

Designed for ease of installation and low ceiling loads, our radiant panels are constructed of modular 150mm wide extruded 6063 T6 aluminium sections to BS1615, which interlock together with matching 75mm wide edge sections to achieve the industry norm 595mm width for fitment in standard ceiling grids. Variants are available for free-hanging, fitting within plasterboard ceilings and surface-mounting. Other widths can be accommodated in multiples of 150mm. Radiant panels are normally supplied in 600 x 600, 600 x 1200 and 600 x 1800 configurations. However, panel lengths can be supplied in infinitely variable increments from 600mm, to a maximum of 3600mm in exceptional circumstances. Continuation modules connect by a special matching aluminium jointing extrusion, which may also be utilised to support adjoining fibre ceiling tiles at ‘non-grid’ locations.Finished with oven-baked polyester powder paint to industry standard RAL 9010, 30% gloss specification, the panels will retain their appearance for many years without degradation. An anti-bacterial coating is available on request. The design is such that the centre lines of adjoining panel sections, which are exposed on the visible face of the panel, correspond with the centre line of the copper tubes.

The overall height of these radiant panels is 50mm with a rebated return of 6mm along both edges. The rebate is provided to facilitate fitment of a 2mm aluminium plate, which may be employed to ‘close off’ the top of the panel, if required.The modular sections of the radiant panel are firmly locked together with Nylon blocks, which are screwed to either side of the copper tubes through the flanges of the tube-seating feature of the panel. These screws will also pass through 19 x 19 x 1.6mm thickness aluminium bracing channel, the ends of which will be fixed to the extruded flange on the two edge sections. C106 Copper tube conforming to BSEN1057 is secured with retaining clips at regular intervals . A standard 600mm width panel has four ‘passes’ of such tube along its length.A continuous double foil faced radiant heat reflector is secured to the upper part of the assembled panel. This extremely lightweight and flame-retardant material provides superior performance over traditional fibreglass insulation. Unlike fibreglass products, it does not collapse, compress or disintegrate. Similarly, it does not promote growth of bacteria and fungi, nor is it affected by humidity or condensation. This means that the insulating value remains unchanged from a dry state to a very high humidity condition.

Fraser Engineering Radiant panels Brochure 2014

Regions serviced for this principal
North West, Yorkshire, North East, North Wales

External Contact
Ken O’Donoughue (Trench)
Paul Phillips (Radiant Panels)

Internal Contact
Lindsey Sankey



01204 888 330




Alexander House, 197 Market Street, Tottington, Bury, BL8 3HF