---
product_id: 3395119
title: "Tjernlund M-4 Metal Inline Duct Fan, 200 CFM, 4\""
brand: "tjernlund"
price: "€ 254.51"
currency: EUR
in_stock: true
reviews_count: 7
category: "Tjernlund"
url: https://www.desertcart.fi/products/3395119-tjernlund-m-4-metal-inline-duct-fan-200-cfm-4
store_origin: FI
region: Finland
---

# 120 VAC power 200 CFM airflow Ultra low noise Tjernlund M-4 Metal Inline Duct Fan, 200 CFM, 4"

**Brand:** tjernlund
**Price:** € 254.51
**Availability:** ✅ In Stock

## Summary

> 💨 Boost your airflow, not your noise — the pro’s choice for clean, quiet ventilation!

## Quick Answers

- **What is this?** Tjernlund M-4 Metal Inline Duct Fan, 200 CFM, 4" by tjernlund
- **How much does it cost?** € 254.51 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/3395119-tjernlund-m-4-metal-inline-duct-fan-200-cfm-4)

## Best For

- tjernlund enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last & Adapt:** Durable metal housing with vibration isolating foam included
- • **Power Meets Precision:** 120 VAC, 100 Watts for efficient, reliable operation
- • **Airflow That Moves You:** 200 CFM capacity handles long duct runs with ease
- • **Plug & Play Convenience:** Includes power cord and mounting bracket for easy installation
- • **Whisper-Quiet Performance:** Engineered for minimal noise and vibration

## Overview

The Tjernlund M-4 Metal Inline Duct Fan delivers a powerful 200 CFM airflow at 120 VAC with only 100 watts of power, engineered for ultra-quiet operation and minimal vibration. Designed for long duct runs and demanding ventilation needs, it includes a mounting bracket, power cord, and vibration isolating foam for easy, secure installation. Ideal for professional-grade bathroom exhaust, radon mitigation, and HVAC system boosting, this durable metal fan ensures efficient, whisper-quiet air movement that outperforms typical duct boosters.

## Description

Versatile and durable the M-Series exhaust fans feature high pressure air handling performance with low noise and extremely low power usage. Simply plug the fan cord into the wireless control and plug the control into an outlet. M-series fans are ideal for long runs or air supply and exhaust applications requiring exacting performance. Use them as super quiet bathroom/spa exhausters to eliminate fogged mirrors and lingering odors. They also work great for exhausting high moisture areas such as sub-slab radon gas mitigation. Included with the fan is a strip of vibration isolating foam for a better fit and to minimize any vibration. All models come with standard power cord.

Review: I couldn't tjern this down... - Anyway, this blower does an outstanding job. It's not like the el-cheapo duct boosters that you get at the big box stores. This is solidly made and has a very high rating of 400+ cfm. That may not mean much to most normal people but to give you an idea, I added this guy to a single 15 foot flex duct of 6" diameter and I swear you can dry your hair under that register. Which gets me to the point that you REALLY need to consider whether you need this Mother of all Blowers or can settle with one of the smaller birdcage blowers. Being the geek that I am, I worked with a mechanical engineer to figure out duct back pressure, nominal cfms at each register, yadda, yadda, yadda. I figured that the real number for my blower is in the area of about 300 cfm so I was pretty sure that this would be overkill. Since the install is for the second floor, I figured the drop in back pressure would help the supply plenum to load up more efficiently. As it turns out, yes and no. This guy performs so well that adding it to a single 15 foot run/one register outlet is a waste...and it will blow napkins right off your table. So my final fix will be to add a 6" wye duct adapter to split the output to two registers. All these registers supply one great room so I'm not that concerned about balancing (at least for the HVAC season). I agree that the blower can be noisy but installing the blower as far from the register completely eliminates the noise, IMO. The noise at the register is due to high pressure air meeting poorly designed registers. This is perfect for my needs, it's TOO powerful. Always a good problem to have because you can fix that - you can't do anything but start over if the blower is wimpy. I also control this with the pneumatically driven duct switch that Tjernlund makes. Works perfectly, very simple. Finally, I also installed their birdcage blower downstairs in a duct that feeds the MBR. Very good quality, a nice bump in air delivery and stone cold quiet. As they say with blowers, one good tjern deserves another. I may pressure you into buying this but don't duct out and give your life a booster right now. OK, OK it's obvious I'm a big fan...
Review: Really Fine Quality Turbine - Our application is a little out of the ordinary and required a really heavy duty, well balanced turbine. Do not confuse this with the widely advertised duct fans that will not blow out a candle. This turbine will launch a sailboat. We created another victorian house solar heat system with over 100 feet of 8" duct work which needed a turbine that would A) run quiet, B) not vibrate, and C) move a lot of air. A) The noise from the fan is the air movement. There is virtually no mechanical noise from the unit. The system is in the attic turret and third floor space; it can not be heard on the second floor. B) To test the balance, we took the fan out of the box, placed it flat on the bench, and put power to it. As it spooled up to full speed, we were on all sides waiting to keep it from bouncing off the bench. Ran for about 2 minutes and did not move. C) Both on suction and pressure side it moves a tremendous amount of air. Comes with a power pigtail attached, and a sturdy mounting bracket. We mounted it on heavy rubber grommets with 3/8" bolts. One improvement that could be made would be a little wider flange for attaching duct work. A thin piece of self adhesive weather strip on the flange and then a sturdy hose clamp rather than an HVAC zip tie will keep the duct secure. A previous installation of this type required a rubber boot on both sides to keep the vibration out of the duct work. This unit is so well balanced, the duct work is directly mounted. For retrofitting exhaust fan applications, this unit will give you the option of mounting it a long way from the air source and still exchange the air adequately. As above, our application involves over 100 feet of 8" duct and it works perfectly. Also look into the Duo-Stat temperature/humidity control or the Woods Timer switches, they both work well with this fan. Manufacturer was very helpful with technical assistance and interest in our unique installation. Great turbine for many different applications!

## Features

- 120 VAC
- 100 Watts
- 200 CFM
- 4" Inlet and Outlet
- Includes mounting bracket and cord

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B008CI55F2 |
| Best Sellers Rank | #460,164 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,191 in Household Ventilation Fans |
| Date First Available | June 18, 2012 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.16 ounces |
| Item model number | M-4 |
| Manufacturer | Tjernlund |
| Product Dimensions | 9 x 9 x 9 inches |

## Product Details

- **Brand:** Tjernlund
- **Color:** Grey
- **Electric fan design:** Exhaust Fan
- **Power Source:** Corded Electric
- **Style:** Industrial
- **Product Dimensions:** 9"D x 9"W x 9"H
- **Room Type:** Bathroom
- **Special Feature:** Variable Speed
- **Recommended Uses For Product:** Exhausting
- **Noise Level:** 200 dB

## Images

![Tjernlund M-4 Metal Inline Duct Fan, 200 CFM, 4" - Image 1](https://m.media-amazon.com/images/I/61UOMKKhclL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ I couldn't tjern this down...
*by K***N on June 11, 2011*

Anyway, this blower does an outstanding job. It's not like the el-cheapo duct boosters that you get at the big box stores. This is solidly made and has a very high rating of 400+ cfm. That may not mean much to most normal people but to give you an idea, I added this guy to a single 15 foot flex duct of 6" diameter and I swear you can dry your hair under that register. Which gets me to the point that you REALLY need to consider whether you need this Mother of all Blowers or can settle with one of the smaller birdcage blowers. Being the geek that I am, I worked with a mechanical engineer to figure out duct back pressure, nominal cfms at each register, yadda, yadda, yadda. I figured that the real number for my blower is in the area of about 300 cfm so I was pretty sure that this would be overkill. Since the install is for the second floor, I figured the drop in back pressure would help the supply plenum to load up more efficiently. As it turns out, yes and no. This guy performs so well that adding it to a single 15 foot run/one register outlet is a waste...and it will blow napkins right off your table. So my final fix will be to add a 6" wye duct adapter to split the output to two registers. All these registers supply one great room so I'm not that concerned about balancing (at least for the HVAC season). I agree that the blower can be noisy but installing the blower as far from the register completely eliminates the noise, IMO. The noise at the register is due to high pressure air meeting poorly designed registers. This is perfect for my needs, it's TOO powerful. Always a good problem to have because you can fix that - you can't do anything but start over if the blower is wimpy. I also control this with the pneumatically driven duct switch that Tjernlund makes. Works perfectly, very simple. Finally, I also installed their birdcage blower downstairs in a duct that feeds the MBR. Very good quality, a nice bump in air delivery and stone cold quiet. As they say with blowers, one good tjern deserves another. I may pressure you into buying this but don't duct out and give your life a booster right now. OK, OK it's obvious I'm a big fan...

### ⭐⭐⭐⭐⭐ Really Fine Quality Turbine
*by K***G on November 5, 2013*

Our application is a little out of the ordinary and required a really heavy duty, well balanced turbine. Do not confuse this with the widely advertised duct fans that will not blow out a candle. This turbine will launch a sailboat. We created another victorian house solar heat system with over 100 feet of 8" duct work which needed a turbine that would A) run quiet, B) not vibrate, and C) move a lot of air. A) The noise from the fan is the air movement. There is virtually no mechanical noise from the unit. The system is in the attic turret and third floor space; it can not be heard on the second floor. B) To test the balance, we took the fan out of the box, placed it flat on the bench, and put power to it. As it spooled up to full speed, we were on all sides waiting to keep it from bouncing off the bench. Ran for about 2 minutes and did not move. C) Both on suction and pressure side it moves a tremendous amount of air. Comes with a power pigtail attached, and a sturdy mounting bracket. We mounted it on heavy rubber grommets with 3/8" bolts. One improvement that could be made would be a little wider flange for attaching duct work. A thin piece of self adhesive weather strip on the flange and then a sturdy hose clamp rather than an HVAC zip tie will keep the duct secure. A previous installation of this type required a rubber boot on both sides to keep the vibration out of the duct work. This unit is so well balanced, the duct work is directly mounted. For retrofitting exhaust fan applications, this unit will give you the option of mounting it a long way from the air source and still exchange the air adequately. As above, our application involves over 100 feet of 8" duct and it works perfectly. Also look into the Duo-Stat temperature/humidity control or the Woods Timer switches, they both work well with this fan. Manufacturer was very helpful with technical assistance and interest in our unique installation. Great turbine for many different applications!

### ⭐⭐⭐⭐ Review
*by A***R on August 4, 2016*

Excellent for moving air out of a crawl space. a little louder than I would have wanted but does the job magnificently. the one I received had two rail mounting feet which made it a whiz to install.

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-02-13*