---
product_id: 3395159
title: "Dundas Jafine Insulated Flexible Duct with Black Jacket, 4-Inches by 25-Feet BPC425R6"
brand: "dundas jafine"
price: "¥56819"
currency: JPY
in_stock: true
reviews_count: 8
category: "Dundas Jafine"
url: https://www.desertcart.jp/products/3395159-dundas-jafine-insulated-flexible-duct-with-black-jacket-4-inches
store_origin: JP
region: Japan
---

# Flexible helix core for easy installation R6 insulation for max energy efficiency Fire-retardant black polyethylene jacket Dundas Jafine Insulated Flexible Duct with Black Jacket, 4-Inches by 25-Feet BPC425R6

**Brand:** dundas jafine
**Price:** ¥56819
**Availability:** ✅ In Stock

## Summary

> 🖤 Upgrade your airflow game with sleek, safe, and smart ducting!

## Quick Answers

- **What is this?** Dundas Jafine Insulated Flexible Duct with Black Jacket, 4-Inches by 25-Feet BPC425R6 by dundas jafine
- **How much does it cost?** ¥56819 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/3395159-dundas-jafine-insulated-flexible-duct-with-black-jacket-4-inches)

## Best For

- dundas jafine enthusiasts

## Why This Product

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

## Key Features

- • **Effortless Flexibility:** Flexible helix core eliminates elbows, making installation in tight spaces a breeze.
- • **UL 181 Certified Safety:** Class 1 air duct with UL mark ensures top-tier fire safety compliance.
- • **Superior Thermal Performance:** R6 fiberglass insulation minimizes heat & cool loss, saving energy and costs.
- • **Durable & Corrosion Resistant:** Galvanized wire core resists rust, extending duct lifespan in any environment.
- • **Versatile Ventilation Solution:** Ideal for HVAC, intake, exhaust, and general ventilation applications.

## Overview

The Dundas Jafine 4" x 25' Insulated Flexible Duct features a UL 181 Class 1 certified flexible helix core wrapped in R6 fiberglass insulation and protected by a fire-retardant black polyethylene jacket. Designed for easy installation without elbows, it offers superior thermal efficiency, corrosion resistance, and versatile use in HVAC and ventilation systems.

## Description

Product Description 4" x 25' Flexible nsulated Duct - Black Jacket R6 From the Manufacturer Dundas Jafine’s flexible insulated duct is UL / cUL 181 listed as a class 1 air duct and bears the mark on the product. This state of the art duct consists of a flexible helix core made of 2 ply polyester laminate and corrosion resistant zinc coated wire. It is surrounded by a blanket of glass fibre insulation that helps to reduce heat and cool loss as well as jacketed by a heavy duty, fire retardant, black polyethylene vapor barrier. Flexible insulated duct can be installed in place of galvanized pipe in most applications. Check local building codes. In addition, due to its flexible nature, the need for elbows is eliminated, allowing for ease of installation in difficult to reach areas. This duct is ideal for use in general ventilation applications including heating, air conditioning, intake and exhaust. R insulation factor R6.0

Review: Well made product... - This is one of those products that i honestly don’t understand why it cannot be picked up at a Lowe’s or Home Depot for less money. The fact is from my use of the product, not only is buying this product less expensive at desertcart, this product is also of superior quality to that stocked locally. I replaced the original bath fans that had previously just vented into the attic. I was looking for something that would prevent condensation, mold or mildew. Pretty much this is the perfect solution. I bought 50!feet of duct, a “y”, and a few other odds and ends from desertcart and ties both bathroom fans in one are of our house to duct work and then to a newly created vent in the gable. At the joint in two 25’ rolls I tried several different types of tape, nothing really worked like I wanted it to. I remember I had a roll of 4” Agri tape (AgriDrain Amazing Tape 4 inch by... https://www.desertcart.com/dp/B07QLP24HY?ref=ppx_pop_mob_ap_share) and it worked better than I could have ever hoped. Make sure to also get a 4” galvanized or aluminum connector piece if you need to join two rolls. Also, depending on how you are supporting it 24” zip ties can work, but 36” assure that you will not have any problems. After connecting both fans and going to the end of the 50’ of this product as well as 8’ of spiral duct connecting racy bath fan to this trunk, i could not get over the positive pressure i felt when running one of the fans. Will it add money to our house, NO, will anybody but me care, NO, but our home will be improved nonetheless. So often i find myself doing these little things that i don’t think make a hill of beans difference, but after a while i do think there is some cumulative effect, some intrinsic benefit that makes life in the house better. After having both of our sons back for almost 5 months during the quarantine, i can tell you that the long hot showers that college kids take don’t seem nearly so bothersome, or steamy.
Review: Worked well. Good ducting. Would use this again. - Used it to install a inline bathroom fan. Worked well. Used scissors to cut through the plastic outer coating, fiberglass insulation and inner plastic duct. Then used snips to cut the wire. The thickness of the duct seams adequate and appears to be durable. I was tugging on it to get it to come out of the insulation a little bit more and it never ripped. I would choose this product again.

## Features

- UL 181 listed as a class 1 air duct and bears the UL mark.
- Flexible helix core made of 2 ply polyester laminate and corrosion resistant galvanized wire
- Surrounded by a blanket of formaldehyde free, fiberglass insulation, that helps to reduce heat and cool loss
- Jacketed by a heavy duty, fire retardant, black polyethylene vapor barrier.
- Flexible insulated duct can be installed in place of galvanized pipe in most applications
- Ideal for use in general ventilation applications including heating, air conditioning, intake and exhaust.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0049H9970 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #374,531 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,037 in HVAC Ducting |
| Color | Black Jacket |
| Customer Reviews | 4.5 4.5 out of 5 stars (259) |
| Date First Available | November 10, 2010 |
| Included Components | One piece 4" x 25 Flexible Insulated Duct |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 7.98 pounds |
| Item model number | BPC425R6 |
| Manufacturer | Dundas Jafine |
| Material | solid |
| Part Number | BPC425R6 |
| Product Dimensions | 32.01 x 11.26 x 10.98 inches |
| Shape | Shape |
| Size | 4" x 25' |
| Special Features | special_feature |
| Thickness | item_thickness.string_value Inches |
| Warranty Description | All merchandise is warranted to be free from defects in workmanship and material for one year from date of purchase. Manufacturer will replace or repair at their option. |

## Images

![Dundas Jafine Insulated Flexible Duct with Black Jacket, 4-Inches by 25-Feet BPC425R6 - Image 1](https://m.media-amazon.com/images/I/312H+59aCbL.jpg)
![Dundas Jafine Insulated Flexible Duct with Black Jacket, 4-Inches by 25-Feet BPC425R6 - Image 2](https://m.media-amazon.com/images/I/51zBFwz87tL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Well made product...
*by M***E on July 24, 2020*

This is one of those products that i honestly don’t understand why it cannot be picked up at a Lowe’s or Home Depot for less money. The fact is from my use of the product, not only is buying this product less expensive at Amazon, this product is also of superior quality to that stocked locally. I replaced the original bath fans that had previously just vented into the attic. I was looking for something that would prevent condensation, mold or mildew. Pretty much this is the perfect solution. I bought 50!feet of duct, a “y”, and a few other odds and ends from amazon and ties both bathroom fans in one are of our house to duct work and then to a newly created vent in the gable. At the joint in two 25’ rolls I tried several different types of tape, nothing really worked like I wanted it to. I remember I had a roll of 4” Agri tape (AgriDrain Amazing Tape 4 inch by... https://www.amazon.com/dp/B07QLP24HY?ref=ppx_pop_mob_ap_share) and it worked better than I could have ever hoped. Make sure to also get a 4” galvanized or aluminum connector piece if you need to join two rolls. Also, depending on how you are supporting it 24” zip ties can work, but 36” assure that you will not have any problems. After connecting both fans and going to the end of the 50’ of this product as well as 8’ of spiral duct connecting racy bath fan to this trunk, i could not get over the positive pressure i felt when running one of the fans. Will it add money to our house, NO, will anybody but me care, NO, but our home will be improved nonetheless. So often i find myself doing these little things that i don’t think make a hill of beans difference, but after a while i do think there is some cumulative effect, some intrinsic benefit that makes life in the house better. After having both of our sons back for almost 5 months during the quarantine, i can tell you that the long hot showers that college kids take don’t seem nearly so bothersome, or steamy.

### ⭐⭐⭐⭐⭐ Worked well. Good ducting. Would use this again.
*by M***D on March 6, 2021*

Used it to install a inline bathroom fan. Worked well. Used scissors to cut through the plastic outer coating, fiberglass insulation and inner plastic duct. Then used snips to cut the wire. The thickness of the duct seams adequate and appears to be durable. I was tugging on it to get it to come out of the insulation a little bit more and it never ripped. I would choose this product again.

### ⭐⭐⭐⭐⭐ Nice quality
*by D***S on November 22, 2024*

These were perfect for all my bathroom exhaust vents.

## Frequently Bought Together

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-01-31*