---
product_id: 209376297
title: "AC Infinity 4\" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans"
brand: "ac infinity"
price: "7211 som"
currency: KGS
in_stock: true
reviews_count: 13
category: "Ac Infinity"
url: https://www.desertcart.kg/products/209376297-ac-infinity-4-backdraft-damper-one-way-airflow-ducting-insert
store_origin: KG
region: Kyrgyzstan
---

# spring-loaded blades airtight rubber gasket 4-inch duct fit AC Infinity 4" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans

**Brand:** ac infinity
**Price:** 7211 som
**Availability:** ✅ In Stock

## Summary

> 🔄 Keep your airflow fresh and your space draft-free with effortless style!

## Quick Answers

- **What is this?** AC Infinity 4" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans by ac infinity
- **How much does it cost?** 7211 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/209376297-ac-infinity-4-backdraft-damper-one-way-airflow-ducting-insert)

## Best For

- ac infinity enthusiasts

## Why This Product

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

## Key Features

- • **Precision 4" Fit:** Seamlessly integrates with standard 4-inch ducting for hassle-free installation.
- • **Versatile Mounting:** Install horizontally or vertically to suit any HVAC setup or space constraints.
- • **Airtight Rubber Seal:** Prevents backdrafts, debris, and pests with a secure, leak-proof grip.
- • **Spring-Loaded Blades:** Automatically open with minimal airflow to maximize ventilation efficiency.
- • **Durable Galvanized Steel:** Powder-coated finish ensures long-lasting corrosion resistance and sleek aesthetics.

## Overview

The AC Infinity 4" Backdraft Damper is a high-quality HVAC accessory designed to prevent unwanted backflow and debris in duct systems. Featuring spring-loaded aluminum blades and airtight rubber gaskets, it fits standard 4-inch ducts and mounts in any orientation. Its galvanized steel body with powder coat finish ensures durability and a professional look, making it ideal for range hoods, bathroom fans, and other ventilation applications.

## Description

AC Infinity 4" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans - desertcart.com

Review: Tight seal and quality construction - I needed some sort of back draft prevention for my bathroom vent fan setup because I was getting bugs and draft in my basement bathroom. These fit right up to other 4 inch ducting, and I used rubber connectors to secure these on. They look sleek, work great, and they have a great quality seal and don't let air back in. They have a double flap to prevent back drafting. I used two of them in my set up to keep each line isolated before a combining y connection
Review: Nice damper - Very precise, quality made product that fits nicely into the 4” flexible, insulated ducting.

## Features

- An antidraft duct insert designed for use with range hoods, bathroom fans and other home HVAC applications.
- Features outer rubber gaskets that create an airtight seal and grip between the damper and ducts.
- Mounts horizontally or vertically to prevent backflow and debris from entering ducting.
- Galvanized steel body with spring-loaded aluminum damper blades that open with minimal airflow.
- Fit for 4 in. Duct Openings | Product Length: 5.03 inches | Finish: Powder Coat

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0842XSTV9 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #10,196 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #15 in HVAC Ducting |
| Customer Reviews | 4.5 4.5 out of 5 stars (561) |
| Date First Available | January 21, 2020 |
| Item Package Quantity | 1 |
| Item Weight | 11.2 ounces |
| Item model number | AC-BDD4-B |
| Manufacturer | AC Infinity |
| Part Number | AC-BDD4-B |
| Product Dimensions | 5 x 3.81 x 3.81 inches |
| Size | 4" |

## Images

![AC Infinity 4" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans - Image 1](https://m.media-amazon.com/images/I/51lALiYTYEL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Tight seal and quality construction
*by C***. on December 2, 2025*

I needed some sort of back draft prevention for my bathroom vent fan setup because I was getting bugs and draft in my basement bathroom. These fit right up to other 4 inch ducting, and I used rubber connectors to secure these on. They look sleek, work great, and they have a great quality seal and don't let air back in. They have a double flap to prevent back drafting. I used two of them in my set up to keep each line isolated before a combining y connection

### ⭐⭐⭐⭐⭐ Nice damper
*by F***A on November 19, 2025*

Very precise, quality made product that fits nicely into the 4” flexible, insulated ducting.

### ⭐⭐⭐⭐⭐ Works but not recommended for low airflow/passive systems
*by M***H on November 10, 2025*

I needed to create an exhaust system for my 3D printer so I purchased the AC Infinity cloud line in-line fan along with this backdraft damper since my exhaust leads directly outdoors. One thing I noticed is that the springs on this damper are pretty stiff so it requires a decent amount of airflow to push the damper flaps open. Using the cloud line S4's speed controller as a reference, the flaps didn't open until I got to level 4. The reason this may be an issue is because in temperature controlled environments (like printing certain types of material) you don't want your in-line fan to be too strong otherwise it will cool your chamber too quickly. Aside from that, the damper is constructed well and will likely last a long time. One other thing to note, I bought the 4" damper and with 4" ducting it is a very tight fit to get the ducting around so it does create a decent enough seal. Overall works well but if you only require a low airflow system like me I would recommend testing this out first before fully installing.

## Frequently Bought Together

- AC Infinity 4" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans
- AC Infinity Flexible 4-Inch Aluminum Ducting, Heavy-Duty Four-Layer Protection, 25-Feet Long for Heating Cooling Ventilation and Exhaust
- AC Infinity Flexible 4-Inch Aluminum Ducting, Heavy-Duty Four-Layer Protection, 8-Feet Long for Heating Cooling Ventilation and Exhaust

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*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-02-24*