315mm Grilles

Looking for 315mm grilles and diffusers? This page collects every 315mm product in our catalogue — ceiling grilles, wall grilles, plastic grille boxes and external louvres — so a complete, matching setup can be ordered in one go. Matching the neck size to your duct or spigot ensures a proper fit first time.

Spend over £400 ex VAT and UK delivery is free. Stocked items ordered before 3pm are dispatched for next-working-day delivery.