---
product_id: 30857955
title: "Double Layer 4 Inch Duct Filter"
brand: "growbright"
price: "£9.51"
currency: GBP
in_stock: true
reviews_count: 8
category: "Grow Bright"
url: https://www.desertcart.co.uk/products/30857955-double-layer-4-inch-duct-filter
store_origin: GB
region: United Kingdom
---

# 4-inch dual-layer fit Outer bug & particle screen Activated carbon filtration Double Layer 4 Inch Duct Filter

**Brand:** growbright
**Price:** £9.51
**Availability:** ✅ In Stock

## Summary

> 🛡️ Breathe cleaner, grow stronger — filter your air like a pro!

## Quick Answers

- **What is this?** Double Layer 4 Inch Duct Filter by growbright
- **How much does it cost?** £9.51 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/30857955-double-layer-4-inch-duct-filter)

## Best For

- growbright enthusiasts

## Why This Product

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

## Key Features

- • **Universal Fit:** Fits standard 4-inch round ducts with easy velcro fastening
- • **Optimized Airflow:** Low restriction design ensures maximum ventilation efficiency
- • **Dual-Layer Defense:** Outer mesh blocks bugs & debris, inner carbon traps fine dust & spores
- • **Durable & Easy to Install:** Robust materials with quick, secure attachment for hassle-free setup
- • **Enhanced Grow Room Air Quality:** Keeps contaminants out for healthier plants and equipment

## Overview

The GrowBright Double Layer 4 Inch Duct Filter features a dual-layer design combining an outer bug screen and an inner activated-carbon layer to trap dust, spores, and pollen. Designed for standard 4-inch round ducts, it offers low airflow restriction and easy installation with velcro fasteners, making it ideal for improving air quality in grow rooms and protecting air-cooled equipment.

## Description

Improve air quality in the grow area with GrowBright duct filters. Dual-layer design keeps contaminants out with minimal airflow restriction. The outer screen catches bugs and larger particles while the inner activated-carbon lined layer traps finer particulates such as dust, spores, and pollen. GrowBright duct filters are also great for keeping debris out of air-cooled reflectors. Filters install easily over duct/flanging and secure tightly with velcro fasteners.

Review: It work - Works like it says . No issues
Review: keeps bugs out - I have suspicion bugs are getting into my basement through a vent, helpfully in the summer I'll find out it works. I wish it fit snugger, probably my fault though.

## Features

- Dust & small particulate filter for 4" round duct/flange air intakes
- Low restriction dual-layer design
- Outer bug/larger-particle screen layer
- Inner activated-carbon-lined smaller-particulate layer
- Fits over standard 4" round ducting/duct flanging

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01BIDJGQ6 |
| Best Sellers Rank | #484,012 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #4,856 in Lawn Mower Air Filters |
| Customer Reviews | 4.2 4.2 out of 5 stars (109) |
| Manufacturer | GrowBright |

## Images

![Double Layer 4 Inch Duct Filter - Image 1](https://m.media-amazon.com/images/I/61LRKUfrrxL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ It work
*by S***P on May 16, 2025*

Works like it says . No issues

### ⭐⭐⭐⭐ keeps bugs out
*by S***E on February 3, 2019*

I have suspicion bugs are getting into my basement through a vent, helpfully in the summer I'll find out it works. I wish it fit snugger, probably my fault though.

### ⭐⭐⭐⭐⭐ Works as advertised
*by V***A on February 11, 2026*

Works as advertised! It comes with velcro so you can wrap the filter cover over your duct and secure it. Even though it's for a 4" duct, I was able to stretch it over a 4" PVC coupler. A little tight but it worked.

## Frequently Bought Together

- GrowBright Double Layer 4 Inch Duct Filter
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- iPower GLDUCT4X8C 4 inch 8 feet Non-Insulated Flex Air Aluminum Foil Ducting Dryer Vent Hose for HVAC Ventilation with 2 Clamps, 4'' X 8', Silver

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**Shop now:** [https://www.desertcart.co.uk/products/30857955-double-layer-4-inch-duct-filter](https://www.desertcart.co.uk/products/30857955-double-layer-4-inch-duct-filter)

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-05-19*