---
product_id: 428106189
title: "iPower 4 inch Shutter Back Draft Blocker, One-Way Airflow Ducting Insert Backflow Preventer with 2 Inline Springs Loaded Folding Blades, 4\" Backdraft Damper, for HVAC Extractor Fan Vent, Range Hoods"
brand: "ipower"
price: "$34.86"
currency: USD
in_stock: true
reviews_count: 13
category: "I Power"
url: https://www.desertcart.ec/products/428106189-ipower-4-inch-shutter-back-draft-blocker-one-way-airflow
store_origin: EC
region: Ecuador
---

# 2 spring-loaded folding blades for smooth airflow Galvanized steel & aluminum build for durability & heat resistance One-way backdraft prevention for reverse airflow protection iPower 4 inch Shutter Back Draft Blocker, One-Way Airflow Ducting Insert Backflow Preventer with 2 Inline Springs Loaded Folding Blades, 4" Backdraft Damper, for HVAC Extractor Fan Vent, Range Hoods

**Brand:** ipower
**Price:** $34.86
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal the airflow, silence the noise — upgrade your vent game now!

## Quick Answers

- **What is this?** iPower 4 inch Shutter Back Draft Blocker, One-Way Airflow Ducting Insert Backflow Preventer with 2 Inline Springs Loaded Folding Blades, 4" Backdraft Damper, for HVAC Extractor Fan Vent, Range Hoods by ipower
- **How much does it cost?** $34.86 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/428106189-ipower-4-inch-shutter-back-draft-blocker-one-way-airflow)

## Best For

- ipower enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last & Perform:** Galvanized steel body with aluminum flaps and stainless steel springs withstands 14-140°F reliably.
- • **Quick & Easy Installation:** Lightweight design and inline insert make upgrading your ventilation system hassle-free.
- • **Effortless Airflow Control:** Spring-loaded blades open only with outgoing air, ensuring zero backflow.
- • **Silent Operation Guaranteed:** Internal foam strip and smooth springs eliminate rattling noise for a peaceful environment.
- • **Universal HVAC Compatibility:** Fits 4-inch ducts perfectly—ideal for range hoods, bathroom fans, and extractor vents.

## Overview

The iPower 4 inch Shutter Back Draft Blocker is a durable, galvanized steel one-way airflow damper featuring two spring-loaded aluminum blades that prevent reverse airflow in HVAC systems. Designed for quiet operation with an internal foam strip and smooth springs, it fits standard 4-inch ducts and is ideal for range hoods, bathroom fans, and extractor vents, ensuring efficient ventilation and backflow prevention.

## Description

iPower 4 inch Backdraft Shutter Damper Back Draft Blocker, One-Way Airflow Ducting Insert Backflow Preventer with 2 Inline Springs Loaded Folding Blades, for HVAC Extractor Fan Vent, Range Hoods

Review: It worked very well and was installed within the wood-fired stove pipe system. - This backdraft is excellent, fits well into the 4" stove pipe system, and is functioning quietly. I would buy again.
Review: perfect fit if joining two pieces of 4" flexible duct - I live in a humid area. So to prevent my bathrooms from getting humid, I simply went into the attic, cut the 4" flexible duct coming from the bathroom exhaust fan going to the soffit, and inserted one of these between the two cut ends of duct. (is a ONE way shutter so just be sure oriented in proper direction) Did this for four ducts. Worked perfectly.

## Features

- Lightweight valve wings: The valve wings open under the pressure created by the airflow and then automatically close with the spring work. The backflow flap closes automatically at low air volumes. The Backdraft shutter is installed so that the damper blades open only in the outflowing air direction
- Keep away from rattling: It has an internal foam strip and a smooth-running spring to keep the valve wings from rattling. The position of the spring should be horizontal for horizontal installations so that it can open and close optimally
- One-way airflow ducting insert: Back-flow valve with 2 spring-loaded wings prevents the reverse airflow movement through the ventilation duct when the ventilation system is turned off
- Material: The 4 inch Backdraft damper is made out of a Galvanized steel, the flap leaves are made of aluminum, while the Axis and spring are made of stainless steel and can withstand temperatures from 14 to 140 °F
- Wide applications: Back draught valves can be inserted into ventilation ducts which are flexible or non-flexible. Designed for use with range hoods, bathroom fans, kitchen and other home HVAC applications. Essential for HVAC ventilation

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09L7MNXMF |
| Best Sellers Rank | #352,234 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2,107 in Registers, Grilles & Vents |
| Customer Reviews | 4.1 4.1 out of 5 stars (210) |
| Item Weight | 8.8 ounces |
| Item model number | 4 inch Backdraft Shutter Damper Back |
| Manufacturer | iPower |
| Product Dimensions | 4.92 x 4.92 x 6.2 inches |

## Images

![iPower 4 inch Shutter Back Draft Blocker, One-Way Airflow Ducting Insert Backflow Preventer with 2 Inline Springs Loaded Folding Blades, 4" Backdraft Damper, for HVAC Extractor Fan Vent, Range Hoods - Image 1](https://m.media-amazon.com/images/I/61oUeNNT2pL.jpg)

## Available Options

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

## Questions & Answers

**Q: Can anyone tell me the temperature rating of this fan?  Can it be used as a forced hot air booster fan?**
A: I'm not exactly sure what the rating is but I believe it's likely to handle it. I mean how hot is the air? If it will melt skin or something then I wouldn't use it... Otherwise should be fine blowing through multiple hoods with 1000s.

**Q: Is the motor for this fan brushless?**
A: Yes it is.

Best regards

**Q: What is the wattage of this fan?**
A: I just went out and checked the label on the fan:  It draws .9 amps at 95 watts.  It blows a lot harder than you would expect for that wattage.

**Q: Is it 770 or 430cfm the spec seems conflicting. Anyone knows the watts**
A: I see your confusion in the specs. I didn't notice that when I bought one. Pretty sure it's 770. I added one of these to it because it was so powerful: http://www.amazon.com/Active-Air-ACSC-Speed-Adjuster/dp/B007TFTITS/ref=pd_sim_lg_2?ie=UTF8&refRID=0370HH92VNG69ATPWJ67

## Customer Reviews

### ⭐⭐⭐⭐⭐ It worked very well and was installed within the wood-fired stove pipe system.
*by K***N on January 9, 2025*

This backdraft is excellent, fits well into the 4" stove pipe system, and is functioning quietly. I would buy again.

### ⭐⭐⭐⭐⭐ perfect fit if joining two pieces of 4" flexible duct
*by A***E on December 11, 2024*

I live in a humid area. So to prevent my bathrooms from getting humid, I simply went into the attic, cut the 4" flexible duct coming from the bathroom exhaust fan going to the soffit, and inserted one of these between the two cut ends of duct. (is a ONE way shutter so just be sure oriented in proper direction) Did this for four ducts. Worked perfectly.

### ⭐⭐⭐⭐ keep outside air out for a dryer
*by B***E on July 24, 2023*

added to a dryer vent hole to help keep the outside air and critters out. Valve flap only opens when the dryer blows out, otherwise it's sealed shut with a foam membrane. Dryer has no problem overcoming the spring tension when it comes on, the unit is galvanized but we'll see how long it lasts with hot moist air coming from the dryer. Easy to install to existing piping and used duct tape to create a nice tight seal.

## Frequently Bought Together

- iPower 4 inch Shutter Back Draft Blocker, One-Way Airflow Ducting Insert Backflow Preventer with 2 Inline Springs Loaded Folding Blades, 4" Backdraft Damper, for HVAC Extractor Fan Vent, Range Hoods
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*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-02-26*