Air Diffusion Specialists
At FNW we’ve been manufacturing and supplying air diffusion products since 1969.
During this time we’ve developed a loyal customer base which includes:
- Architects and specifiers
- Consulting engineers
- Ducting manufacturers
- Installers of air conditioning / extraction systems

Made in England
Air diffusion products supplied by FNW are all manufactured at our West Yorkshire premises by our skilled staff and engineers.
Our product range includes:
- Direct mounted grilles for spiral ducting
- Double and single deflection side wall air supply grilles
- ‘Eyelash’ 1, 2, 3 and 4-way ceiling supply grilles
- Fixed louvre ceiling diffusers; 1, 2, 3 and 4-way discharge
- Fixed louvre air return grilles
- ‘Eggcrate’ air return grilles and ceiling panels
- Intake and discharge louvres (internal and external)
- Air transfer grilles
- Pressure dampers – back pressure and pressure relief dampers
All our products can be supplied with sub-frames, filter frames, plenum boxes and volume control dampers.
Bespoke products
If you’re looking for a non-standard sized grille for a project, then we can help.
Thanks to our on-site production facility we can manufacture bespoke grilles and air diffusion products to meet our customers’ specific needs.
Specialist customers
As we have the ability to manufacture corrosion resistant grilles, diffusers and louvres in coated steel, plastics and stainless steel we supply to a number of specialist industries including:
- Pharmaceutical
- Food
- Chemical
If you’d like to know more about FNW Engineering and our range of British made grilles and air diffusion products then call 01484 861233 or complete our online contact form.
