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Fits standard 100mm ducting – Designed for 4” round ventilation ducting, providing a neat finish at wall or ceiling entry points. Square plate with fixing holes – Includes four pre-formed mounting points for secure installation on plasterboard, masonry, or timber surfaces. Quick and easy to install – Simple to position and fix, ideal for both DIY users and professional ventilation installations. Creates a tidy duct opening – Covers rough or uneven cut edges to give a clean, professional appearance around larger duct holes Lightweight, durable plastic – Made from strong white plastic that resists cracking and is suitable for long-term indoor use.