---
product_id: 94155081
title: "2 x Cavity Wall Combination Extension Sleeves for 9\" x 3\" Air Brick Vents G935"
brand: "home.smart"
price: "A$55"
currency: AUD
in_stock: true
reviews_count: 4
url: https://www.desertcart.com.au/products/94155081-2-x-cavity-wall-combination-extension-sleeves-for-9-x
store_origin: AU
region: Australia
---

# 120-280mm cavity extension Adjustable 3-7 brick courses 6,600mm² airflow 2 x Cavity Wall Combination Extension Sleeves for 9" x 3" Air Brick Vents G935

**Brand:** home.smart
**Price:** A$55
**Availability:** ✅ In Stock

## Summary

> 🧱 Elevate your ventilation game — because your home deserves breathable walls!

## Quick Answers

- **What is this?** 2 x Cavity Wall Combination Extension Sleeves for 9" x 3" Air Brick Vents G935 by home.smart
- **How much does it cost?** A$55 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/94155081-2-x-cavity-wall-combination-extension-sleeves-for-9-x)

## Best For

- home.smart enthusiasts

## Why This Product

- Trusted home.smart brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built-In Vermin Protection:** Special grille included to block unwanted pests while maintaining airflow.
- • **Maximized Airflow Efficiency:** Delivers a generous 6,600mm² airflow to keep your underfloor void perfectly ventilated.
- • **Certified Condensation Control:** Meets NHBC and BS 5250 standards to safeguard your building from damp and condensation.
- • **Customizable Fit for Any Build:** Telescopic design adjusts seamlessly between 3 to 7 brick courses for a tailored installation.
- • **Extended Reach with Cavity Sleeves:** Add 120-280mm extra depth to fit complex cavity walls effortlessly.

## Overview

The Manthorpe G935 Pair of Cavity Wall Combination Extension Sleeves enhances underfloor ventilation by extending the reach of telescopic vents from 3 to 7 brick courses, providing 6,600mm² of airflow. Designed to fit 9" x 3" air brick vents, these sleeves add 120-280mm cavity depth, include vermin-proof grilles, and comply with NHBC and BS 5250 standards for effective condensation control.

## Description

2 x Cavity Wall Combination Extension Sleeves for 9" x 3" Air Brick Vents G935

## Features

- Manthorpe Telescopic Underfloor Vents with Extensions.
- Manthorpe Telescopic Underfloor Vents with Extensions.
- Designed to provide a clear airflow passage to the void underneath a suspended floor.
- Provides 6,600mm² of airflow.
- The telescopic feature enables it to be adjusted between 3 and 7 brick courses.
- Meets NHBC requirements for the control of condensation in buildings.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Home.smart |
| Part Number | HS-974-VAR |
| Manufacturer reference | HS-974-VAR |
| Colour | G935 Pair of Cavity Sleeves |

## Images

![2 x Cavity Wall Combination Extension Sleeves for 9" x 3" Air Brick Vents G935 - Image 1](https://m.media-amazon.com/images/I/61AExWQGRmL.jpg)

## Available Options

This product comes in different **Colour Name** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great
*by W***Y on 10 February 2025*

Perfect

### ⭐⭐⭐⭐ good
*by O***R on 4 April 2023*

good

### ⭐⭐⭐⭐⭐ Perfect Fit
*by M***E on 10 November 2020*

Having a Older Property, the Cavity wall vent boxes were plywood, one was well rotten on the weather side,so replacing with plastic eliminated a musty smell.The flexibility of the inter-joining parts gave me the ability to fix in position tight against the covering vent grilles, stopping any rain ingress.

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**Shop now:** [https://www.desertcart.com.au/products/94155081-2-x-cavity-wall-combination-extension-sleeves-for-9-x](https://www.desertcart.com.au/products/94155081-2-x-cavity-wall-combination-extension-sleeves-for-9-x)

---

*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-14*