Shop by Grille Neck Size
Shop grilles and diffusers by neck size — the duct-connection dimension you match to the spigot, duct or aperture the grille will sit on. Sizes run from 100mm to 1000mm across 22 pages, taking in ceiling grilles, wall grilles, plastic grille boxes and external louvres.
Alpha Air Ventilation Supplies is a Leicester-based supplier of commercial and industrial ventilation equipment. Stocked items ordered before 3pm are dispatched for next-working-day delivery, and UK delivery is free on orders over £400 ex VAT.
You can also browse by style in the main louvres and grilles category.
Showing 1–16 of 164 results
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Air Extract Valves – Fire Rated – 160mm
£52.20 + VAT Add to basket -
Eggcrate Grille with Damper – 150mm x 150mm Neck (195mm x 195mm Face)
£23.83 + VAT Add to basket -
Eggcrate Grille with Damper – 200mm x 200mm Neck (245mm x 245mm Face)
£28.00 + VAT Add to basket -
Eggcrate Grille with Damper – 250mm x 250mm Neck (295mm x 295mm Face)
£35.38 + VAT Add to basket -
Eggcrate Grille with Damper – 300mm x 300mm Neck (345mm x 345mm Face)
£41.60 + VAT Add to basket -
Eggcrate Grille with Damper – 350mm x 350mm Neck (395mm x 395mm Face)
£54.90 + VAT Add to basket -
Eggcrate Grille with Damper – 400mm x 400mm Neck (445mm x 445mm Face)
£61.30 + VAT Add to basket -
Eggcrate Grille with Damper – 450mm x 450mm Neck (495mm x 495mm Face)
£62.65 + VAT Add to basket -
Eggcrate Grille with Damper – 500mm x 500mm Neck (545mm x 545mm Face)
£76.45 + VAT Add to basket -
Eggcrate Grille with Damper – 550mm x 550mm Neck (595mm x 595mm Face)
£80.15 + VAT Add to basket -
Circular Weather Louvre – 100mm
£9.37 + VAT Add to basket -
Air Extract Valves – 100mm
£6.65 + VAT Add to basket -
Air Extract Valves – Fire Rated – 100mm
£33.48 + VAT Add to basket -
Air Supply Valves – 100mm
£6.65 + VAT Add to basket -
Air Supply Valves – Fire Rated – 100mm
£39.00 + VAT Add to basket -
Grille Box (Plenum Box) – 100mm x 100mm x 100mm
£7.00 + VAT Choose Options