---
product_id: 288305824
title: "calimaero® 4 Inch Backdraft Exhaust Damper Seal One Size Fits All Duct Backdraft Damper Gravity Powered Made in Germany HVAC Damper Dryer Vent Valve Keep Cold Air Out"
brand: "calimaero"
price: "273 kr"
currency: DKK
in_stock: true
reviews_count: 13
category: "Calimaero"
url: https://www.desertcart.dk/products/288305824-calimaero-4-inch-backdraft-exhaust-damper-seal-one-size-fits
store_origin: DK
region: Denmark
---

# 4-inch universal fit Weather-resistant durability Easy, no-tool installation calimaero® 4 Inch Backdraft Exhaust Damper Seal One Size Fits All Duct Backdraft Damper Gravity Powered Made in Germany HVAC Damper Dryer Vent Valve Keep Cold Air Out

**Brand:** calimaero
**Price:** 273 kr
**Availability:** ✅ In Stock

## Summary

> 🚫❄️ Stop drafts before they start—seal in comfort, seal out the cold!

## Quick Answers

- **What is this?** calimaero® 4 Inch Backdraft Exhaust Damper Seal One Size Fits All Duct Backdraft Damper Gravity Powered Made in Germany HVAC Damper Dryer Vent Valve Keep Cold Air Out by calimaero
- **How much does it cost?** 273 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/288305824-calimaero-4-inch-backdraft-exhaust-damper-seal-one-size-fits)

## Best For

- calimaero enthusiasts

## Why This Product

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

## Key Features

- • **Silent Operation:** Rubber seal design eliminates rattling—peaceful airflow without annoying noise.
- • **Universal 4-Inch Fit:** Seamlessly fits all standard ducts—no guesswork, no extra purchases.
- • **Effortless Installation:** Simply insert and seal—no tools, no hassle, just instant draft protection.
- • **Gravity-Powered Efficiency:** No springs, no motors—just smart, reliable backdraft prevention that lasts.
- • **Durable Weather-Resistant Build:** Engineered with premium rubber and recycled plastic to withstand humidity and time.

## Overview

The calimaero® 4 Inch Backdraft Exhaust Damper Seal is a German-engineered, gravity-powered HVAC accessory designed to fit all standard 4-inch ducts. Made from weather-resistant rubber and recycled plastic, it prevents cold air backdrafts in dryer vents, bathroom fans, and exhaust pipes. Its easy, tool-free installation and silent operation make it a must-have for maintaining energy efficiency and comfort in any home or workspace.

## Description

calimaero® 4 Inch Backdraft Exhaust Damper Seal One Size Fits All Duct Backdraft Damper Gravity Powered Made in Germany HVAC Damper Dryer Vent Valve Keep Cold Air Out - desertcart.com

Review: Fit perfectly. - I needed this at the end of a 20 foot run of flexible duct. It fit perfectly in the 4 inch plastic flange I installed in the wall. I agree with other reviews that the plastic bar holding the rubber flap in place is pretty flimsy. I used some Loctite Fun-Tak Mounting Tabs to secure it. The manufacturer should have used a stainless steel spring instead of the plastic bar. The damper works great for me. 105 CFM bathroom fan pushes the rubber flaps open easily and absolutely no backdraft when the fan is off. I will buy this again.
Review: Not the quality pictured - I was a little skeptical of the mechanism but was lured by the thin dimensions. The product I received is basically junk. It is not as pictured. The flapper is not black plastic or rubber, but rather this light brown, very thin, very flimsy rubber. It doesn't have enough stiffness to even overcome gravity if the flapper is facing downward, and when facing upward the flap doesn't sit flat (I tried adjusting it a bit, as it's just friction-fit in place, but it is just too thin and cannot be made to sit flat). I don't consider this the same product pictured, and this substitute does not even function.

## Features

- PRODUCT FEATURES This 4inch damper vent air blocker does what it is designed to do. It prevents outside air from entering back into your house via dryer, bathroom fan, and grow tent. You will be very pleased with the quality, functionality, value, and ease of installation of this product.
- EASY INSTALLATION The 4 inch backflow preventer is easy to install. You will only cram these in the 4" duct and the rubber flap will seal off drafts coming in from your dryer vent or bathroom exhaust fan. Make sure the flaps open away from the ventilator. The outer rubber ring creates a seal around the strong plastic body giving you the perfect vent damper.
- FLEXIBLE This backdraft damper's main recycled plastic part is small enough to fit into almost all PVC, metal, and other ducts with 4 inch size. No need to buy multiple products to find the one that works. Purchase with ease and relax in your draft free living space.
- CONVENIENT This 4 inline damper duct valve gummi flaps are easy to open for almost all dryers or booster fans. The lack of moving spring will ensure a long lifespan that will save you time and money. As the product is made out of weather-resistant plastic, you can install the dryer damper in high-humidity environments.
- WELL MADE It works in any orientation even 45 degrees or 15 for that matter. The rubber seal is quieter than all metal or plastic models. This will ensure you will not be disturbed by constant annoying rattling from cheaper models.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08W4DM7Y5 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #128,073 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #768 in Registers, Grilles & Vents |
| Brand | calimaero |
| Color | Black |
| Customer Reviews | 3.6 3.6 out of 5 stars (625) |
| Date First Available | February 7, 2021 |
| Exterior Finish | Plastic |
| Inlet Connection Size | 4 Inches |
| Inlet Connection Type | Barb |
| Is Discontinued By Manufacturer | Yes |
| Item Package Quantity | 1 |
| Item Weight | 1.06 ounces |
| Item dimensions L x W x H | 4.72 x 4.41 x 0.98 inches |
| Item model number | Backdraft Exhaust Damper Seal 100 |
| Manufacturer | calimaero |
| Material | Rubber |
| Number of Ports | 2 |
| Outlet Connection Size | 4 Inches |
| Outlet Connection Type | Flange |
| Part Number | 4054503048133 |
| Pattern | Inline Backdraft Exhaust Damper |
| Product Dimensions | 4.72 x 4.41 x 0.98 inches |
| Shape | Round |
| Size | 4 Inch |
| Specification Met | CE, RoHS |
| Style | Industrial |
| Usage | For use in all exhaust pipes |
| Warranty Description | 2 years |

## Product Details

- **Brand:** calimaero
- **Exterior Finish:** Plastic
- **Inlet Connection Size:** 4 Inches
- **Inlet Connection Type:** Barb
- **Item dimensions L x W x H:** 4.72 x 4.41 x 0.98 inches
- **Material:** Rubber
- **Number of Ports:** 2
- **Outlet Connection Size:** 4 Inches
- **Outlet Connection Type:** Flange
- **Specification Met:** CE, RoHS

## Images

![calimaero® 4 Inch Backdraft Exhaust Damper Seal One Size Fits All Duct Backdraft Damper Gravity Powered Made in Germany HVAC Damper Dryer Vent Valve Keep Cold Air Out - Image 1](https://m.media-amazon.com/images/I/61E6gaV5tvL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fit perfectly.
*by T***T on December 13, 2021*

I needed this at the end of a 20 foot run of flexible duct. It fit perfectly in the 4 inch plastic flange I installed in the wall. I agree with other reviews that the plastic bar holding the rubber flap in place is pretty flimsy. I used some Loctite Fun-Tak Mounting Tabs to secure it. The manufacturer should have used a stainless steel spring instead of the plastic bar. The damper works great for me. 105 CFM bathroom fan pushes the rubber flaps open easily and absolutely no backdraft when the fan is off. I will buy this again.

### ⭐ Not the quality pictured
*by S***N on December 9, 2021*

I was a little skeptical of the mechanism but was lured by the thin dimensions. The product I received is basically junk. It is not as pictured. The flapper is not black plastic or rubber, but rather this light brown, very thin, very flimsy rubber. It doesn't have enough stiffness to even overcome gravity if the flapper is facing downward, and when facing upward the flap doesn't sit flat (I tried adjusting it a bit, as it's just friction-fit in place, but it is just too thin and cannot be made to sit flat). I don't consider this the same product pictured, and this substitute does not even function.

### ⭐⭐⭐⭐ Worked with minor modification
*by T***F on January 2, 2024*

I was looking for a back flow preventer with minimal pressure drop that would seal tightly. I live in a condo with an ducted exhaust that sometimes has reversals that can bring smoke or odors into out unit. Out of the box the flapper was puckered but I was able to cut small notches to allow it to lay flat. life is compromise an I could not mount vertical because the weight of the flapper made it open and I was afraid it would not close for minor reversals. I was able to install it horizontal which appears to work pretty good.

## Frequently Bought Together

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-03-11*