---
product_id: 21861104
title: "Mr. Heater 4 inch Stainless Steel Horizontal Vent Kit for Big Maxx MHU50 and MHU80 Unit Heaters, One Size, Metal"
brand: "mr. heater"
price: "€ 926.95"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.nl/products/21861104-mr-heater-4-inch-stainless-steel-horizontal-vent-kit-big
store_origin: NL
region: Netherlands
---

# Adjustable dimensions Complete venting kit 9 essential components Mr. Heater 4 inch Stainless Steel Horizontal Vent Kit for Big Maxx MHU50 and MHU80 Unit Heaters, One Size, Metal

**Brand:** mr. heater
**Price:** € 926.95
**Availability:** ✅ In Stock

## Summary

> 🔥 Breathe Easy with Mr. Heater's Ultimate Venting Solution! 🔥

## Quick Answers

- **What is this?** Mr. Heater 4 inch Stainless Steel Horizontal Vent Kit for Big Maxx MHU50 and MHU80 Unit Heaters, One Size, Metal by mr. heater
- **How much does it cost?** € 926.95 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/21861104-mr-heater-4-inch-stainless-steel-horizontal-vent-kit-big)

## Best For

- mr. heater enthusiasts

## Why This Product

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

## Key Features

- • **Compliance Ready:** Meets 2012 Cat standards for peace of mind.
- • **Comprehensive Kit:** Includes 9 essential parts for seamless venting.
- • **Robust Construction:** Durable stainless steel for long-lasting performance.
- • **Effortless Installation:** All-in-one venting solution for quick setup.
- • **Versatile Compatibility:** Designed for MHU50, MHU80, and more.

## Overview

The Mr. Heater 4 inch Stainless Steel Horizontal Vent Kit is a complete venting solution designed for Big Maxx MHU50 and MHU80 unit heaters. This robust kit includes 9 essential components, such as an adjustable elbow and various vent pipes, ensuring a seamless installation process. Crafted from durable metal, it meets the latest compliance standards, making it a reliable choice for efficient heating.

## Description

Mr. Heater 4 inch Stainless Steel Horizontal Vent Kit for Big Maxx MHU50 and MHU80 Unit Heaters

## Features

- F102860 Features: -All parts for complete venting. -Adjustable elbow. Product Type: -Vent kit/Diffuser. Material: -Metal. Number of Items Included: -9. Pieces Included: -adapter, b-vent pipe, 2 vent pipes, 90 degree elbow, wall thimble, roof flashing, storm collar, vent cap. Dimensions: -The thimble for through the wall use can expand about 4. Overall Height - Top to Bottom: -6.5". Overall Width - Side to Side: -13.5". Overall Depth - Front to Back: -37". Overall Product Weight: -13 lbs."
- All parts for horizontal venting
- Can be used with MHU45 and MHU75
- Meets new Cat 2012 s/s
- Instructions included

## Product Details

- **Brand:** Mr. Heater
- **Special Feature:** Lightweight
- **Color:** Metal
- **Form Factor:** Cabinet
- **Indoor/Outdoor Usage:** Indoor

## Images

![Mr. Heater 4 inch Stainless Steel Horizontal Vent Kit for Big Maxx MHU50 and MHU80 Unit Heaters, One Size, Metal - Image 1](https://m.media-amazon.com/images/I/61nJjF0L1NL.jpg)
![Mr. Heater 4 inch Stainless Steel Horizontal Vent Kit for Big Maxx MHU50 and MHU80 Unit Heaters, One Size, Metal - Image 2](https://m.media-amazon.com/images/I/6182XY5yzbL.jpg)
![Mr. Heater 4 inch Stainless Steel Horizontal Vent Kit for Big Maxx MHU50 and MHU80 Unit Heaters, One Size, Metal - Image 3](https://m.media-amazon.com/images/I/51nN5LrlzWL.jpg)

## Questions & Answers

**Q: Is this kit long enough for a 7/12 pitch roof**
A: It's a horizontal vent kit, it goes through the side wall of the structure. The roof pitch should not matter.

**Q: Is this vent pipe approved to ul std 1738 for category iii appliance?**
A: Hello, thank you for having taken the time to contact us :)
To answer your question, this stainless steel horizontal vent kit allows Category 3 Unit/Utility heaters to comply to both the Canadian Standard (S636) and the US Standard (UL1738). It meets all of the latest 2012 building heating codes for using category III venting

I hope that I was able to help you. Don't hesitate to contact us again if you need more information. 
Thank you and have a nice day!

Claudine

**Q: Is it crazy the horizontal vent kit is more $ than the heater unit itself?**
A: It’s definitely expensive. I purchased mine from Northern Tool.

**Q: Does this kit come with a 45* or a 90*? Picture shows a 45 degree but description says 90 degree  Or is it adjustable?**
A: There are no 90's. It has a 45 deg ell.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect
*by D***N on May 12, 2022*

We bought this for my heater in my greenhouse, it was easy to install for my husband and his cousin. There is a lot of extra pieces we didn’t need but who knows where I’ll use those pieces

### ⭐⭐⭐⭐⭐ Great fit easy install looks great!
*by A***R on June 1, 2023*

Plenty of parties to install in just about any position.Looks great

### ⭐⭐⭐⭐ Watch out if going straight out the back
*by R***R on November 17, 2012*

the contents of this kit did not match what it said on the mr. heater site..maybe they changed b4/after. however, this kit is best intended for a corner mount of the heater so that the piping turns 45 degrees and exits either side wall.mine was mounted parallel to rear wall and i could not use the 45 degree piece of pipe , so i was 12" short for the un... had to buy that piece and get it shipped here b4 i could finish the job. kit also includedx a 3" to 4" adapter piece .. not sure why as the mr heater 80k btu already terminates in 4" .. so another wasted piece and lenth that i could not use.this kit is pricey in canada..$400 .. went to port huron MI and got it for $217top quality piping with it;s integrated silicone seals

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-02-15*