---
product_id: 165431197
title: "6 inch 390 CFM Duct Fan by Formline Supply. Variable Speed Controller."
brand: "formline supply"
price: "FREE"
currency: DKK
in_stock: false
reviews_count: 8
category: "Home Improvement"
url: https://www.desertcart.dk/products/165431197-6-inch-390-cfm-duct-fan-by-formline-supply-variable
store_origin: DK
region: Denmark
---

# 6 inch 390 CFM Duct Fan by Formline Supply. Variable Speed Controller.

**Brand:** formline supply
**Price:** FREE
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** 6 inch 390 CFM Duct Fan by Formline Supply. Variable Speed Controller. by formline supply
- **How much does it cost?** FREE with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/165431197-6-inch-390-cfm-duct-fan-by-formline-supply-variable)

## Best For

- formline supply enthusiasts

## Why This Product

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

## Description

Long life with low energy consumption -2 YEAR WARRANTY - CE LISTED -Speed 2550 RPM, Current 0.55A, Air Flow 390 CFM, Voltage 110/120V, Power 67W

## Features

- HELP MAINTAIN THE PERFECT PLANT ENVIRONMENT - Help simulate the fresh breeze plants enjoy in the wild within your grow tent. This grow tent exhaust or air intake vent system can create an environment where your flowers can thrive. Reduce the chances of root issue or pests due to excessive moisture and heat.
- EFFICIENT DESIGN - Formline fans are Quiet, Long lasting, have low energy consumption. CE Listed
- MULTIPURPOSE USE - In addition to Grow Rooms and Garden Tents, this 6 inch fan works great as an attic fan, bathroom fan, and commercial cooling
- 100% SATISFACTION GUARANTEE - All Formline Supply purchases are backed by our 100% Satisfaction guarantee. We ensure that you will be fully satisfied with your product or you will receive your money back.
- ›See more product details

## Images

![6 inch 390 CFM Duct Fan by Formline Supply. Variable Speed Controller. - Image 1](https://m.media-amazon.com/images/I/3149oapGLFL.jpg)
![6 inch 390 CFM Duct Fan by Formline Supply. Variable Speed Controller. - Image 2](https://m.media-amazon.com/images/I/511FtKGsTjL.jpg)
![6 inch 390 CFM Duct Fan by Formline Supply. Variable Speed Controller. - Image 3](https://m.media-amazon.com/images/I/51iqk6HcGVL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Too big for my 48x48x80 tent
            
*by M***Y on September 3, 2018*

The fan works well but the cfm for this 6-inch fan is a little too high for my 48x48x80 tent. Even with two 6-inch and two 4-inch vents open, and the fan on lowest speed setting, it sucks in the sides of the tent signicantly. I probably could have bought a 4-inch fan since I use LED lights which don't give off a lot of heat. I use a maximum of four 600 watt lamps, depending on how many seed trays I'm growing.
  

### ⭐⭐⭐⭐⭐ Good quality quiet fan
            
*by J***O on June 23, 2018*

This fan works great, I bought two for a grow tent set up. One fan is used with a charcoal filter, and another for the air intake. They work as described, are strong, and quiet. I read mixed reviews of the fan being noisy, the fan is pretty quiet in my opinion. But there is a very slight humming noise heard in other rooms while runnning. The fan does not feel or look cheap and is made with quality pieces. I would highly recommend.
  

### ⭐⭐⭐ Works, but a bit too noisey
            
*by J***S on June 25, 2018*

Does what it's supposed to (moves air), fairly easy to install and hook to ducts. Variable speed is a nice feature. Still running after several months in a hot attic.However this is NOT especially quiet!. It's pulls air from a water heater closet through about 4 feet of duct, and when It's on I can hear it through the closet door. Fortunately the closet in a laundry room where noise is not a big issue, but I wouldn't use this connected to a living space.
  

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**Shop now:** [https://www.desertcart.dk/products/165431197-6-inch-390-cfm-duct-fan-by-formline-supply-variable](https://www.desertcart.dk/products/165431197-6-inch-390-cfm-duct-fan-by-formline-supply-variable)

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-03-04*