---
product_id: 209376297
title: "AC Infinity Backdraft Damper for 4\" Ducting"
brand: "ac infinity"
price: "₨923"
currency: SCR
in_stock: null
reviews_count: 13
category: "Ac Infinity"
url: https://www.desertcart.sc/products/209376297-ac-infinity-backdraft-damper-for-4-ducting
store_origin: SC
region: Seychelles
---

# Spring-loaded blades for effortless airflow Rubber gaskets ensure airtight seal Galvanized steel body for durability AC Infinity Backdraft Damper for 4" Ducting

**Brand:** ac infinity
**Price:** ₨923
**Availability:** ❌ Out of Stock

## Summary

> 🚫💨 Stop drafts before they start — upgrade your airflow game!

## Quick Answers

- **What is this?** AC Infinity Backdraft Damper for 4" Ducting by ac infinity
- **How much does it cost?** ₨923 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.sc](https://www.desertcart.sc/products/209376297-ac-infinity-backdraft-damper-for-4-ducting)

## 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

- • **Robust Construction:** Galvanized steel frame with powder coat finish guarantees long-lasting resistance to wear and corrosion.
- • **Airtight Seal Technology:** Outer rubber gaskets create a secure grip, eliminating drafts and enhancing energy efficiency.
- • **Precision Fit for 4" Ducts:** Seamlessly integrates with standard HVAC setups for hassle-free installation.
- • **Versatile Mounting Options:** Install horizontally or vertically to suit any ducting orientation without compromising performance.
- • **Dual-Action Backdraft Prevention:** Spring-loaded aluminum blades close tightly to block unwanted airflow and debris.

## Overview

The AC Infinity Backdraft Damper is a premium 4-inch duct insert designed to prevent backflow and debris intrusion in HVAC systems. Featuring a galvanized steel body, spring-loaded aluminum blades, and airtight rubber gaskets, it ensures efficient one-way airflow for range hoods, bathroom fans, and more. Its versatile mounting and durable construction make it a must-have upgrade for any modern home ventilation setup.

## 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 | #11,883 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #14 in HVAC Ducting |
| Customer Reviews | 4.5 4.5 out of 5 stars (566) |
| 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 Backdraft Damper for 4" Ducting - 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 Seychelles*
*Store origin: SC*
*Last updated: 2026-03-06*