---
product_id: 48826074
title: "White Gravity Grille 155mm External Dimension Ducting Air Vent with 100mm - 4 inch Round Rear Spigot and Not-Return Shutters"
brand: "kair"
price: "VT5990"
currency: VUV
in_stock: true
reviews_count: 8
category: "Kair"
url: https://www.desertcart.vu/products/48826074-white-gravity-grille-155mm-external-dimension-ducting-air-vent-100mm
store_origin: VU
region: Vanuatu
---

# 7200mm² free airflow 155mm external dimension Automatic non-return shutters White Gravity Grille 155mm External Dimension Ducting Air Vent with 100mm - 4 inch Round Rear Spigot and Not-Return Shutters

**Brand:** kair
**Price:** VT5990
**Availability:** ✅ In Stock

## Summary

> 🌬️ Elevate your airflow game with effortless, smart ventilation!

## Quick Answers

- **What is this?** White Gravity Grille 155mm External Dimension Ducting Air Vent with 100mm - 4 inch Round Rear Spigot and Not-Return Shutters by kair
- **How much does it cost?** VT5990 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/48826074-white-gravity-grille-155mm-external-dimension-ducting-air-vent-100mm)

## Best For

- kair enthusiasts

## Why This Product

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

## Key Features

- • **Smart Gravity Shutters:** Automatic non-return flaps prevent backflow of odors, noise, and drafts without fragile springs.
- • **Durable & Low Maintenance:** Robust polypropylene construction with a sleek white finish for long-lasting, filterless operation.
- • **Maximized Airflow Efficiency:** Generous 7200mm² free air area delivers optimal ventilation performance for any space.
- • **Versatile & Regulation-Ready:** Ideal for bathrooms, kitchens, HVAC, and compliant with Part F Building Regulations.
- • **Precision Fit, Effortless Install:** 155mm x 155mm external size with a 100mm rear spigot ensures seamless push-fit ducting integration.

## Overview

The Kair White Gravity Grille is a high-performance 155mm external dimension ducting air vent featuring a 100mm round rear spigot and automatic non-return shutters. Designed for easy push-fit installation, it offers 7200mm² free airflow and prevents backflow of odors and drafts without springs. Perfect for residential and commercial ventilation systems, it meets Part F Building Regulations and is built from durable polypropylene for reliable, maintenance-free operation.

## Description

Shop Kair White Gravity Grille 155mm External Dimension Ducting Air Vent with 100mm - 4 inch Round Rear Spigot and Not-Return Shutters. Free delivery on eligible orders of £20 or more.

Review: Well made - Good quality at a good price.
Review: great fit, works great - easy fit, works great, really helps to reduce the condensation and flaps keep the wind/rain out

## Features

- White Plastic Ducting Air Inlet / Air Outlet with Gravity Shutters. 155mm x 155mm external dimension with 4 inch / 100mm round male rear spigot on the back of the grille for indoor or outdoor use.
- Non-return shutter flaps close automatically when not in use. Stops unpleasant odours, noises, or draughts flowing back through your duct. Gravity flap - no need for springs that could break.
- Easy to install, just push-fit duct and fittings together. Perfectly suited Bathroom or Kitchen extractor fan, Hydroponics fan, or In-Line Extract Fan.
- This grille can be used as a part of a long ductwork run for a variety of purposes including whole house ventilation, passive ventilation, positive input, air conditioning, HVAC, and Heat Recovery Systems.
- Suitable to use in compliance with Part F Building Regulations. Airflow performance independently tested by BSRIA or BRE. Free Air: 7200mm2. Static Pressure Drop in Pascals: 15 l/s = 10.94 Pa - 30 l/s = 18.59 Pa - 60 l/s = 24.21 Pa.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004X4RVUQ |
| Air Flow Capacity | 7329.6 Cubic Centimetres Per Second |
| Best Sellers Rank | 1,955 in DIY & Tools ( See Top 100 in DIY & Tools ) 4 in Registers, Grilles & Vents |
| Brand | Kair |
| Colour | White |
| Controls Type | Motion Sensor |
| CountryOfOrigin | United Kingdom |
| Customer Reviews | 4.5 out of 5 stars 3,756 Reviews |
| Filter Type | Filterless |
| Finish Type | Painted |
| Global Trade Identification Number | 05060272540890 |
| IncludedComponents | Non-return shutter flaps, 4 inch / 100mm round male spigot |
| Item Dimensions D x W x H | 10.2D x 39.4W x 15.5H centimetres |
| Item Form | Pyramid |
| Item Weight | 0.18 Pounds |
| Item height | 15.5 centimetres |
| Manufacturer | Kair |
| MaterialType | Polypropylene (PP) |
| Model | SYS-100 |
| Mounting Type | Wall Mount |
| Number of Speeds | 1 |
| SpecialFeatures | Automatic Non-Return Shutters |
| Unit Count | 1.0 Count |
| Vent Hood Design | Wall Mounted Canopy Hood |
| Ventilation Type | ductet |

## Product Details

- **Brand:** Kair
- **Product dimensions:** 10.2D x 39.4W x 15.5H centimetres
- **Colour:** White
- **Special feature:** Automatic Non-Return Shutters
- **Finish type:** Painted

## Images

![White Gravity Grille 155mm External Dimension Ducting Air Vent with 100mm - 4 inch Round Rear Spigot and Not-Return Shutters - Image 1](https://m.media-amazon.com/images/I/51fLm0u-8WL.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: Is the 10cm the size of the 'flaps' or the width of the whole unit?**
A: the size is not applicable to either of the above , it refers to the size of ducting you can attach to the grill tohere is the actual sizes for the gravity grill 100mm / 10cm Product Type	Wall VentHeight (mm)	155Length (mm)	155Width (mm)	40Spigot size (mm)	28 x 96 x 96

**Q: Does anyone know if when the extractor is on are the flaps meant to open up? Mines doesn’t  seem to open up at all.**
A: Assuming the extractor fan is blowing out through the grille, the flaps should open. How far they open depends on the strength of the air-flow from the fan.

**Q: What is the pitch of the fixing holes, looking for 110mm horizontal by 100mm vertical.**
A: The fixing holes on this product correspond to the measurement you are looking for 110mm wide between securing holes x 100mm high between securing holes

**Q: Has anyone used this on an plastic outdoor keter shed?**
A: should be fine with a suitable interface sealant

## Customer Reviews

### ⭐⭐⭐⭐⭐ Well made
*by A***R on 18 November 2025*

Good quality at a good price.

### ⭐⭐⭐⭐⭐ great fit, works great
*by J***N on 3 December 2025*

easy fit, works great, really helps to reduce the condensation and flaps keep the wind/rain out

### ⭐⭐⭐⭐ Good value, easy to fit.
*by M***S on 27 October 2025*

Easy to fit, good replacement, better than the original.

## Frequently Bought Together

- Kair White Gravity Grille 155mm External Dimension Ducting Air Vent with 100mm - 4 inch Round Rear Spigot and Not-Return Shutters
- Kair Plastic Ducting Pipe 100mm - 350mm Short Length - Rigid Straight Duct Channel
- Kair White Louvred Wall Vent Grille 155mm External Dimension with Flyscreen and Round 100mm - 4 inch Rear Spigot

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**Shop now:** [https://www.desertcart.vu/products/48826074-white-gravity-grille-155mm-external-dimension-ducting-air-vent-100mm](https://www.desertcart.vu/products/48826074-white-gravity-grille-155mm-external-dimension-ducting-air-vent-100mm)

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-02-13*