---
product_id: 638441073
title: "REDTRON 400CM Universal Window Seal for Portable Air Conditioner And Tumble Dryer, Works with Every Mobile Air Conditioning Unit, Hot Air Stop, Easy to Install(No Need for Drilling Holes)"
brand: "redtron"
price: "€ 46.30"
currency: EUR
in_stock: true
reviews_count: 13
category: "Redtron"
url: https://www.desertcart.hr/products/638441073-redtron-400cm-universal-window-seal-for-portable-air-conditioner-tumble
store_origin: HR
region: Croatia
---

# energy-saving airlock seal 300CM universal fit no-drill easy install REDTRON 400CM Universal Window Seal for Portable Air Conditioner And Tumble Dryer, Works with Every Mobile Air Conditioning Unit, Hot Air Stop, Easy to Install(No Need for Drilling Holes)

**Brand:** redtron
**Price:** € 46.30
**Availability:** ✅ In Stock

## Summary

> ❄️ Seal in the cool, seal out the hassle!

## Quick Answers

- **What is this?** REDTRON 400CM Universal Window Seal for Portable Air Conditioner And Tumble Dryer, Works with Every Mobile Air Conditioning Unit, Hot Air Stop, Easy to Install(No Need for Drilling Holes) by redtron
- **How much does it cost?** € 46.30 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/638441073-redtron-400cm-universal-window-seal-for-portable-air-conditioner-tumble)

## Best For

- redtron enthusiasts

## Why This Product

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

## Key Features

- • **Hassle-Free Setup:** Comes with all installation essentials—no drilling or extra purchases needed; window remains fully functional.
- • **Cool Faster, Save More:** Locks hot air out and keeps cool air in for quicker, efficient cooling and lower electricity bills.
- • **Universal Compatibility:** Fits all common window types (except sliding) and portable ACs or tumble dryers up to 300CM perimeter.
- • **Dual-Zip Design for Perfect Fit:** Upgraded four-zip system fits single or dual hose AC units, ensuring airtight, balanced airflow.
- • **Waterproof & Mosquito-Proof Shield:** Durable, washable material blocks insects, dust, and moisture for a cleaner, healthier home.

## Overview

The REDTRON 300CM Universal Window Seal is a waterproof, washable, and easy-to-install airlock kit designed to fit most portable air conditioners and tumble dryers. Featuring a new dual-zip design for single or dual hose setups, it prevents hot air intrusion, reduces energy consumption, and blocks insects without drilling or damaging your window.

## Description

Product Description REDTRON Window Seal --- Let Your Air Conditioner Breath Keep Cooler, Save Money! Stop cool air escaping from your open window! REDTRON AC accessory seals your hinged window to stop cool air escaping, meaning that your portable air conditioner works as efficiently as possible. REDTRON Window Seal stops warm air flowing from AC coming back in your room, so your living room, your office, your bedroom cools down quicker and stays cooler for longer. REDTRON window seal is water repellent and protects rain from entering your home when you left the window open. On top of it does it also prevents insects from visiting you. Perfect For Your Window！ Easy To Install 1 - Apply the adhesive hook tape to the inside of your window frame and to the window itself. 2 - Attach the window seal to the hook tape. 3 - Open the zip on the window seal and place your air conditioner hose out of the window. Insert One Hose Pinch air hose by using the zipper Lock the hose using the cable tie provided Or Insert Two Hoses! There are two zippers provided for a second hoses No Drilling And No Tools Required There is no need to buy window kits, hose adapters or other tools, everything you need for installation is included in the product for easy operation. Strong Sealing The air-conditioning sealing cloth fits tightly to the window frame and locks the hose in the sealing cloth for a strong seal. Stopping cold air from escaping and mosquitoes from entering. Stop Cool Air Escaping Suitable For Many Window Types! Roof Top Windows Type REDTRON Window Seal is also suitable for top-hung roof top windows. Pull-in Window Type REDTRON Window Seal is also suitable for inward opening casement windows. Push-out Window Type REDTRON Window Seal is also suitable for outward opening casement windows. REDTRON 400CM Window Seal Water Repellent And High Quality REDTRON window seal repels moisture and protects against rain The zippers are high quality incorporated into the material The hoop tape is sewn tightly to the window seal Which is the Right Size for My Window? Calculate the perimeter of your window Choose the window seal size that is closer to your perimeter. E.g. a+b+c+d = 380 cm, the right size is 400 cm Note: unable use it on a Left and right sliding window or door. Package Including 1 x Window Seal Cloth (400CM) 1 x Hook Tape 1 x Use Manual 4 x Cable Tie

Review: Great door curtain for my portable air con unit - We are experiencing super-hot weather in the UK at the moment and buying this curtain turned out to be a wise move. Before buying this I had a piece of cardboard attached to the end of the pipe and used to try and wedge it in a window but there was so much air flow leakage, it wasn't a good idea. I found the install of the curtain really easy applying the velcro tape, its really sticky so no problems with it coming off. The fit was slightly too big for my door but it didn't matter as managed to make it seal. The zips seem good quality, not had any breakages yet and been using it for a few weeks. Overall an excellent doorway air con curtain.
Review: Just what i needed - Just what I was looking for, good size and works well for doors that also open inwards. Easy to install and stays in place. Doesn’t let any air in and cools the room down quickly.

## Features

- Vent Hot Air Out of Your Room: REDTRON window seal vent hot air out of your room from the hose of your mobile AC unit by locking the hose between the window frame and the window casement. Our waterproof window sealing cloth worries you free of insects and mosquitoes, creating a cooler room in hot summer.
- Enhance Cooling Performance: REDTRON portable A/C window kit seals around your window and then zip around your hose which directs your ventilation outside. Thanks to this great idea, your room can be cooled in less time and the A/C unit creates an excellent cooling performance for you.
- Energy Saving and Money Saving Choice: REDTRON air conditioner hose seal helps to reduce energy consumption and to lower emission of carbon dioxide. A well-constructed exhaust ventilation system saves your electric bills under efficient cooling enjoyment with our window seal.
- Quick and Easy Installation: No need for drilling holes. All just involves sticking the cloth inside the window frame and window itself. Then pinch air hose in the window seal by using zipper and lock the hose with cable tie to direct airflow outside.
- Universal Fit: The 157Inch AC exhaust hose sealing cloth is suitable for all portable air conditioners and tumble dryers. It is also compatible with most Windows with a maximum perimeter of 400CM. No matter it is crank or casement windows, you can set up your exhaust mount easily.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07R55RRRW |
| Air Conditioner Application | portable |
| BEE Star Rating | 5 Star |
| Best Sellers Rank | 71,426 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 111 in Air Conditioner Parts & Accessories |
| Brand | REDTRON |
| Brand Name | REDTRON |
| Cable Length | 400 Centimetres |
| Colour | White |
| Compressor Type | reciprocating |
| Control Method | Remote |
| Controller Type | Touch Control |
| Core Material | Foam or rubber |
| Country Of Origin | China |
| Customer Reviews | 4.1 out of 5 stars 992 Reviews |
| Efficiency | High Efficiency |
| Form Factor | Cloth |
| Installation Type | No drilling required |
| Inverter Type | No Inverter |
| Is Outdoor Unit Required | No |
| Is Product Cordless | No |
| Item Dimensions D x W x H | 13D x 13W x 22.9H centimetres |
| Item Weight | 300 Grams |
| Manufacturer | Redtron |
| Model Name | HK041 |
| Model Number | 041 |
| Number Of Circuits | 1 |
| Number of Power Levels | 1 |
| Power Source | Corded Electric |
| Product dimensions | 13D x 13W x 22.9H centimetres |
| Seasonal Energy Efficiency Ratio (SEER) | 10 |
| Seasonal energy efficiency ratio (SEER) | 10 |
| Special Features | Portable,Waterproof |
| Special feature | Portable,Waterproof |
| Start Year | 2022 |
| Start year | 2022 |
| UPC | 682559350548 682559350500 |
| Voltage | 400 Volts |
| Warranty Type | Limited |
| Wattage | 154 watts |
| Window Opening Maximum Height | 2.7 Metres |
| Window Opening Maximum Width | 199 Centimetres |
| Window Opening Minimum Height | 190 Centimetres |
| Window Opening Minimum Width | 99 Centimetres |

## Images

![REDTRON 400CM Universal Window Seal for Portable Air Conditioner And Tumble Dryer, Works with Every Mobile Air Conditioning Unit, Hot Air Stop, Easy to Install(No Need for Drilling Holes) - Image 1](https://m.media-amazon.com/images/I/619lyg8kkUL.jpg)
![REDTRON 400CM Universal Window Seal for Portable Air Conditioner And Tumble Dryer, Works with Every Mobile Air Conditioning Unit, Hot Air Stop, Easy to Install(No Need for Drilling Holes) - Image 2](https://m.media-amazon.com/images/I/41NN4qWs3lL.jpg)
![REDTRON 400CM Universal Window Seal for Portable Air Conditioner And Tumble Dryer, Works with Every Mobile Air Conditioning Unit, Hot Air Stop, Easy to Install(No Need for Drilling Holes) - Image 3](https://m.media-amazon.com/images/I/5185b43Y00L.jpg)
![REDTRON 400CM Universal Window Seal for Portable Air Conditioner And Tumble Dryer, Works with Every Mobile Air Conditioning Unit, Hot Air Stop, Easy to Install(No Need for Drilling Holes) - Image 4](https://m.media-amazon.com/images/I/619VPxd9dTL.jpg)
![REDTRON 400CM Universal Window Seal for Portable Air Conditioner And Tumble Dryer, Works with Every Mobile Air Conditioning Unit, Hot Air Stop, Easy to Install(No Need for Drilling Holes) - Image 5](https://m.media-amazon.com/images/I/61+DXyUzunL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great door curtain for my portable air con unit
*by J***K on 11 July 2025*

We are experiencing super-hot weather in the UK at the moment and buying this curtain turned out to be a wise move. Before buying this I had a piece of cardboard attached to the end of the pipe and used to try and wedge it in a window but there was so much air flow leakage, it wasn't a good idea. I found the install of the curtain really easy applying the velcro tape, its really sticky so no problems with it coming off. The fit was slightly too big for my door but it didn't matter as managed to make it seal. The zips seem good quality, not had any breakages yet and been using it for a few weeks. Overall an excellent doorway air con curtain.

### ⭐⭐⭐⭐⭐ Just what i needed
*by H***O on 7 August 2024*

Just what I was looking for, good size and works well for doors that also open inwards. Easy to install and stays in place. Doesn’t let any air in and cools the room down quickly.

### ⭐⭐⭐⭐ Does the job but a bit of a faff
*by R***B on 19 June 2025*

It works just fine once installed but is a bit of a faff to get it around the window just right. Always gets a bit tight in certain spots and the adhesive for the double sided velcro only really lasts for one summer. As long as you are happy to have to re-do it once a year (which on reflection isnt really a hardship) then its absolutely fine.

## Frequently Bought Together

- REDTRON 300CM Universal Window Seal for Portable Air Conditioner And Tumble Dryer, Works with Every Mobile Air Conditioning Unit, Hot Air Stop, Easy to Install(No Need for Drilling Holes)
- Air Conditioning Unit Portable Air Conditioner 9000 BTU 4-in-1 Dehumidifier, Cooling Fan with 2 Speeds, Digital Display & Remote Control, Window Kit, 24 Hour Timer for Room Up to 269sq.ft

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-06-10*