Timloc Underfloor, Vent, Horizontal Front Extension + 115mm (20 pcs)

The Timloc 115mm underfloor vent front extension is a straightforward component that solves a very specific problem: your wall is too thick for a standard telescopic underfloor ventilator to bridge on its own. Specifically, it fits between the airbrick and the upper front opening of the telescopic underfloor ventilator, extending the assembly to suit walls exceeding 102.5mm and up to a maximum of 215mm. If you’re working on solid brick construction, cavity fills, or anything with a beefier external leaf, this is the piece that makes the installation possible.

Underfloor ventilation is one of those things that gets ignored until it causes a problem, and by then you’re pulling up floorboards in a house that smells like a damp cellar. Getting the vent assembly correctly sized through the wall matters. A poor fit means gaps, restricted airflow, or a front plate that sits proud of the brickwork and looks a mess. The 115mm extension eliminates that compromise by adding the extra depth needed to complete the telescopic unit properly.

Where the Timloc 115mm Front Extension Fits Into Your Build

This extension is designed exclusively for use with Timloc’s telescopic underfloor ventilator system. It’s a horizontal front extension, so it sits at the outer face of the wall, bridging the gap between the airbrick body and the decorative or functional front plate above. It’s not a standalone vent and won’t do much sitting in a bucket on its own, but as part of the Timloc system it’s the piece that allows the whole assembly to work neatly in walls built beyond standard single-skin dimensions.

Available in a useful range of colours including white, black, buff, brown, terracotta, grey, blue and black, and clear, so matching to existing brickwork or render colour is straightforward. Pack of 20 makes this sensible for site use, where you’re unlikely to need just one.

Compatibility Within the Timloc System

It’s worth confirming before ordering that you’re working with the correct Timloc telescopic ventilator model. The 115mm front extension is part of a modular system, and using the right extension depth for your wall thickness is the whole point. Measure the wall first, account for the airbrick depth, and confirm which extension length you need. Timloc produce extensions in different sizes, so the timloc 115mm underfloor vent front extension is for walls in that specific thickness range. Get that right and the rest of the install is simple.