---
product_id: 449021282
title: "4 Inch Insulated Flexible Duct,HVAC Insulation Duct,25 Feet Insulated Duct, 4 in Insulated Duct Hose, R4.2 Air Flexible Duct Aluminum Hose 4''25' Long,for HVAC Flex Ductowrk"
brand: "cuchiilo"
price: "A$169"
currency: AUD
in_stock: true
reviews_count: 13
category: "Cuchiilo"
url: https://www.desertcart.com.au/products/449021282-4-inch-insulated-flexible-duct-hvac-insulation-duct-25-feet
store_origin: AU
region: Australia
---

# 4-inch diameter for versatile HVAC fit Up to 85% noise reduction with sound-absorbing glass wool R-4.2 insulation rating for superior thermal resistance 4 Inch Insulated Flexible Duct,HVAC Insulation Duct,25 Feet Insulated Duct, 4 in Insulated Duct Hose, R4.2 Air Flexible Duct Aluminum Hose 4''25' Long,for HVAC Flex Ductowrk

**Brand:** cuchiilo
**Price:** A$169
**Availability:** ✅ In Stock

## Summary

> 🛠️ Upgrade your airflow game with the duct that works as hard as you do!

## Quick Answers

- **What is this?** 4 Inch Insulated Flexible Duct,HVAC Insulation Duct,25 Feet Insulated Duct, 4 in Insulated Duct Hose, R4.2 Air Flexible Duct Aluminum Hose 4''25' Long,for HVAC Flex Ductowrk by cuchiilo
- **How much does it cost?** A$169 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/449021282-4-inch-insulated-flexible-duct-hvac-insulation-duct-25-feet)

## Best For

- cuchiilo enthusiasts

## Why This Product

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

## Key Features

- • **Quiet Comfort Zone:** Fluffy glass fiber core absorbs sound, slashing noise by up to 85% for a peaceful environment.
- • **Thermal Shield Power:** R-4.2 Owens Corning glass wool insulation keeps your system energy-smart and temperature-stable.
- • **Flexible Fit, Zero Fuss:** Bend and install effortlessly—no rigid elbows needed, maintaining airflow efficiency.
- • **Durable & Flame-Resistant:** Thickened aluminum foil and high-strength spiral steel wire resist heat, acids, and flames.
- • **Multi-System Compatibility:** Perfect for central HVAC, fresh air ventilation, and mechanical recovery without corrosive gases.

## Overview

The Cuchiilo 4 Inch Insulated Flexible Duct is a 25-foot long, R-4.2 rated HVAC duct featuring thick aluminum foil, high-strength spiral steel wire, and Owens Corning glass wool insulation. Designed for superior thermal resistance, noise reduction up to 85%, and flexible installation without rigid elbows, it’s ideal for central air conditioning and ventilation systems requiring durable, flame-retardant, and corrosion-resistant ductwork.

## Description

Cuchiilo 4 Inch Insulated Flexible Duct,HVAC Insulation Duct,25 Feet Insulated Duct, 4 in Insulated Duct Hose, R4.2 Air Flexible Duct Aluminum Hose 4''25' Long,for HVAC Flex Ductowrk - desertcart.com

Review: It’s Ducting—And It Does Exactly What Ducting Should - Not much to say here: it’s 6" insulated flexible ducting, and it did the job perfectly. Easy to work with, solid insulation, and exactly what I needed for my project. Sometimes you just need something that works without any drama—and this delivered. Five stars!
Review: Tough Enough if you're careful - The inner "foil" layer was much tougher than another reviewer said. It's more of a "mylar" plastic silver mirror kind of material. I only needed 15 to 17 feet, so I didn't mind ruining the end I attached to a rope for pulling through the hordes of black widows and rattlers. The insulation is as expected. I did tear the outer layer just a tiny bit pulling it with a rope I'd fish-taped through a confined crawlspace trench I had to hand-excavate. Attaching it firmly to the flanges worked well however the Hose Clamp, or Radiator Clamp style items supplied were some metric size I had no socket bit for. So, picture a guy on his back in dirt with spider webs hanging down trying to use a flathead driver on his drill to tighten a long long long clamp. One spider said: Hey, how-ya-doin?" I have patience. I attached it to one flange from inside the home, the other from underneath. Both ends were easier than expected. This is a quality product, but fragile as you might imagine. Be careful of it and it's tough enough and a good value.

## Features

- 【🌿🛒High-quality performance 4 in insulated flexible duct】Made of thickened aluminum foil material and made of high-strength elastic spiral steel wire.The middle is covered with glass fiber insulation layer, which has high temperature resistance, acid and alkali resistance, and flame retardancy.
- 【🌿🛒Owens Corning Glass Wool Insualtion 】Glass wool Insualtion is the safest building material, with high corrosion resistance and thermal insulation,R value: R-4.2. The temperature resistance range is -4℃~454℃.
- 【🌿🛒Sound absorption and noise reduction insulation】 The internal structure of glass wool insulationis fluffy and the overall density is large, which can absorb the sound in time,Noise can be reduced by up to 85%.
- 【🌿🛒4 inch insulated flexible duct】 It can be bent arbitrarily, without rigid elbows, the aluminum foil is self-sustaining and will not retract after installation.It can maintain the flatness in the tube and reduce the wind resistance.
- 【🌿🛒Multi Function of the 4 in insulated flexible duct】Used for high, medium and low pressure ventilation system without corrosive gas. Mainly used in central air conditioning HVAC system,Fresh air ventilation systems, mechanical equipment recovery systems and other ventilation systems that do not contain corrosive gases, etc.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09Y1JV2SV |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #21,932 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #23 in HVAC Ducting |
| Color | R-4.2 Insulation |
| Coverage | 10.47 square feet, R-4.2 |
| Customer Reviews | 4.4 4.4 out of 5 stars (253) |
| Date First Available | April 15, 2022 |
| Item Package Quantity | 1 |
| Item Weight | 4.99 pounds |
| Manufacturer | Cuchiilo |
| Material | Rubber |
| Product Dimensions | 300 x 4 x 0.04 inches |
| Size | 4 IN 25 FT |
| Thickness | 10.2 Centimeters |

## Product Details

- **Brand:** Cuchiilo
- **Item Thickness:** 10.2 Centimeters
- **Manufacturer:** Cuchiilo
- **Material:** Rubber
- **Product Dimensions:** 300"L x 4"W

## Images

![4 Inch Insulated Flexible Duct,HVAC Insulation Duct,25 Feet Insulated Duct, 4 in Insulated Duct Hose, R4.2 Air Flexible Duct Aluminum Hose 4''25' Long,for HVAC Flex Ductowrk - Image 1](https://m.media-amazon.com/images/I/71WBnYiYrLL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ It’s Ducting—And It Does Exactly What Ducting Should
*by D***N on November 28, 2025*

Not much to say here: it’s 6" insulated flexible ducting, and it did the job perfectly. Easy to work with, solid insulation, and exactly what I needed for my project. Sometimes you just need something that works without any drama—and this delivered. Five stars!

### ⭐⭐⭐⭐⭐ Tough Enough if you're careful
*by M***K on December 17, 2024*

The inner "foil" layer was much tougher than another reviewer said. It's more of a "mylar" plastic silver mirror kind of material. I only needed 15 to 17 feet, so I didn't mind ruining the end I attached to a rope for pulling through the hordes of black widows and rattlers. The insulation is as expected. I did tear the outer layer just a tiny bit pulling it with a rope I'd fish-taped through a confined crawlspace trench I had to hand-excavate. Attaching it firmly to the flanges worked well however the Hose Clamp, or Radiator Clamp style items supplied were some metric size I had no socket bit for. So, picture a guy on his back in dirt with spider webs hanging down trying to use a flathead driver on his drill to tighten a long long long clamp. One spider said: Hey, how-ya-doin?" I have patience. I attached it to one flange from inside the home, the other from underneath. Both ends were easier than expected. This is a quality product, but fragile as you might imagine. Be careful of it and it's tough enough and a good value.

### ⭐⭐⭐⭐⭐ GREAT VALUE
*by J***. on November 19, 2025*

WORKED GREAT

## Frequently Bought Together

- Cuchiilo 4 Inch Insulated Flexible Duct,HVAC Insulation Duct,25 Feet Insulated Duct, 4 in Insulated Duct Hose, R4.2 Air Flexible Duct Aluminum Hose 4''25' Long,for HVAC Flex Ductowrk
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- Aluminum Foil Tape, 2 inch x 65 Feet (3.9 mil), Insulation Adhesive Metal High Temperature Heavy Duty HVAC Tape, Silver for Ductwork, Dryer Vent, HVAC

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-20*