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Diffusers and grilles
Diffusers and grilles are used to provide a covering to ventilation terminals. They are typically found where air conditioning or extraction systems are installed such as in hotels, offices, schools and other public buildings. Read More
Displacement units can direct supply air in the desired direction and include fixed blade, louvred, bar and deflection diffusers.
An air valve is an adjustable diffuser that can be opened and closed on demand.
Different types of grille are available for exhaust air, return air and transfer air.
Decorative grilles are used where appearance is important, and can be specified in finishes such as polished brass, chrome or nickel. They typically have a perforated, mesh or linear slot format.
Diffusers and grilles - helping you find the best solution for your project.

Anti-ligature ventilation grille - steel cover for secure air vents
Contour anti-ligature ventilation grilles are made from 1.5mm Zintec or Magnelis steel and designed to reduce ligature risks in mental health and care environments by covering standard ventilation grilles. Grilles have an IP3X rating, antimicrobial powder coating and security fixings for authorised access. Standard and bespoke sizes available- PRODUCT
Contour Heating Products
FN linear bar grilles
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The FN type curved linear grille offers a wide range of blade formats to meet both architectural and system requirements and is ideally suited to sidewall, bulkhead or cill applications. The grilles can be fabricated in a curves in a variety of radii to suit the specifier. Grilles can be supplied in modular units or, for continuous applicationsMRA circular diffusers
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MRA circular diffusers are high capacity air terminals specifically designed to suit applications such as atria, auditoria or industrial premises. The core position is adjustable via a central screw thread, giving conventional horizontal diffusion for exposed duct or ceiling-mounted installations, or a progressively adjustable vertical projection- PRODUCT
- Brooke Air
Ceiling Diffuser
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type ADT ceiling diffusers are used as supply air or extract air diffusers for comfort zones; attractive design element for building owners and architects with demanding aesthetic requirements; horizontal 1, 2, 3, or 4 way supply air discharge for mixed flow ventilation; high induction results in a rapid reduction of temperature differences andBlade floor ventilation grille
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Floor grilles are made to order. They are available framed and unframed in a number of different finishes- PRODUCT
- A & H Brass
Architectural woven mesh - aluminium
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Woven aluminium mesh is offered for use with natural, convection or forced ventilation systems, for supply or extract applications, to cloak apertures or enhance design. Handmade woven aluminium meshes are manufactured to suit designers requirements. A very wide variety of styles are available. The frame may be standard angle, tee, and channel
Perforated stainless steel mesh is offered for use with natural, convection or forced ventilation systems, for supply or extract applications, to cloak apertures or enhance design. Handmade punched meshes are manufactured to suit designers requirements. A variety of styles of perforation are available. The frame may be standard angle, tee, and9"x3" (225 x 75mm) Air Bricks
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Britannia air bricks for internal and external ventilation are manufactured in the UK from aluminium or cast iron: victorian, Georgian, Edwardian period original patterns; contemporary designs; fly mesh fitted as an optional extra. Metric airbricks compatible with heating and ventilation systems interlock with standard plastic ducting systems are- PRODUCT
- Britannia Architectural Metalwork
Ceiling Swirl Diffusers
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TROX is able to manufacture a range of ceiling swirl diffusers to meet most requirements including: fixed or adjustable blades; all types of ceiling system including exposed ceilings; manual or motorised adjustment; circular or square diffusers; supply and extract air; variable and constant flow volumes; very high ceiling applications; offices andArchitectural woven mesh - stainless steel
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Woven stainless steel mesh is offered for use with natural, convection or forced ventilation systems, for supply or extract applications, to cloak apertures or enhance design. Handmade woven meshes are manufactured to suit designers requirements. A very wide variety of styles are available. The frame may be standard angle, tee, and channel
The Type PSC diffuser has been designed for installation on climate ceiling panels developed by HC KP. It features a radial blow pattern and Coanda effect. The air supply system prevents induced air from passing directly along the ceiling panel, preventing dirt deposits and minimising ceiling discolouration. Its low profile design gives a visually- PRODUCT
- Barcol-Air
The QLI induction-type displacement flow diffuser is available in nominal lengths of 900, 1200 and 1500mm, with vertical het exchanger and condensate drip tray. Induction-type displacement flow diffuser with 2- or 4-pipe heat exchanger, for installation under a sill. The condensate drip tray is useful if the temperature temporarily falls below theCKD adjustable jet diffuser
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CKD adjustable jet diffusers are designed for ceiling installation and have aerodynamically shaped outlet cones. The CKD is a circular multi-cone jet diffuser for ceiling or wall mounting. It can handle extremely large air flows at low sound levels. It is suitable for constant or variable air flow. Can be supplied at under- or over-temperatures
Pelican diffusers are square, perforated supply and exhaust air units designed for installation in modular or fixed suspended ceilings. The air diffusers can manage the discharge of air substantially below room temperature as well as constant or variable airflows. They are equipped with adjustable air deflectors for flexible distribution patternsTG non-vision transfer air grilles
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TG transfer grilles are suitable for mounting in walls or doors where transfer ventilation is required between adjacent areas. The TG grille features a sight-proof single core. The various frame configurations are all available with an optional removable core. (Not suitable for door mounting). Intumescent core blocks (type BV60) with a 1 hour fireIDB under-sill induction unit
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IDB is an under-sill induction unit with 2- or 4-pipe heat exchanger, of compact height, for installation under a sill or on a wall. The condensate drip tray is useful if the temperature temporarily falls below the dew point: high heating and cooling capacity with a low conditioned primary air volume flow rate and low sound power level; high- PRODUCT
- TROX UK
DDH and DDV are double deflection, adjustable supply air grilles. DDH have horizontal front blades, while DDV have vertical front blades. They are suitable for most commercial applications and can be utilised in exposed duct, ceiling or sidewall situations. The individually adjustable blades provide complete spread and directional jet control upVentilation Grilles - Floor Installation
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TROX offers single ventilation grilles and horizontal run sections with special profiled blades. Nominal sizes: 300x75-1800x300mm and horizontal run sections. Volume flow rate range: 17-1350 l/s or 6-4860 m³/h. Grille face made of aluminium with powder-coat finish. Front border suitable for floor installation without an installation subframeRCDD reversible louvre, adjustable grilles
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RCDD grilles are are adjustable supply air grilles with a reversible louvre. The RC reversible core grille is particularly suited to cill and sidewall applications requiring an attractive, versatile air terminal. The close pitch and profile of the core blades are specifically designed to promote rapid diffusion of the air supply, thereby ensuring
DRG rectangular terminals are designed for small air flows, the air being supplied to the room at low velocity. Units are mounted under seats in the riser of the steps. The spread pattern is easily adjustable using rotatable discs. They are suitable for rooms where many small units can be spread out for the best possible distribution of supplyFL Flowline linear diffuser
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Flowline is a linear continuous slot diffuser that has been developed for aerodynamically efficient air distribution systems. The design of the deflection tube produces both low noise and low pressure losses, making it suitable for use with variable air volume, fan coil or induction systems. Adjustment of the tubes can be easily carried out from- PRODUCT
- Brooke Air
Lockzone ceiling terminal
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Lockzone ceiling terminals are rectangular units designed for supply air distribution. Guide vane perforations are designed for vortex diffusion and allow the supply of air at temperatures substantially below room temperature. guide vane perforations arranged in a radial pattern; flush design; supply air diffuser also works for extract airLinear slot vent
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The linear slot ventilator is a sturdy and attractive ventilator constructed from a brass base. It is available in a variety of finishes including various types of brass, chrome and nickel. It is available in numerous sizes ranging from 152x76mm up to 305x305mm- PRODUCT
- A & H Brass
RGD Rigidcore floor grille
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RGD Rigidcore grilles are designed for use with under floor perimeter heating or ventilation systems and are ideal for applications requiring a lay-in core. Rigidcore grilles are available in section lengths up to 600mm and incorporate location pins in the tube ends for ease of alignment. They are available with either 12.5mm or 19mm blade pitches

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