---
product_id: 582610774
title: "VIVOSUN Inline Booster Duct Fan 4” 100 CFM, HVAC Exhaust Ventilation Fan with Low Noise for Basements, Bathrooms, Kitchens, Attics, Grow Tents, Black"
brand: "vivosun"
price: "¥9145"
currency: JPY
in_stock: true
reviews_count: 13
category: "Vivosun"
url: https://www.desertcart.jp/products/582610774-vivosun-inline-booster-duct-fan-4-100-cfm-hvac-exhaust
store_origin: JP
region: Japan
---

# 100 CFM airflow under 30 dB noise 2935 RPM motor speed VIVOSUN Inline Booster Duct Fan 4” 100 CFM, HVAC Exhaust Ventilation Fan with Low Noise for Basements, Bathrooms, Kitchens, Attics, Grow Tents, Black

**Brand:** vivosun
**Price:** ¥9145
**Availability:** ✅ In Stock

## Summary

> 💨 Quiet power that moves your air—and your vibe.

## Quick Answers

- **What is this?** VIVOSUN Inline Booster Duct Fan 4” 100 CFM, HVAC Exhaust Ventilation Fan with Low Noise for Basements, Bathrooms, Kitchens, Attics, Grow Tents, Black by vivosun
- **How much does it cost?** ¥9145 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/582610774-vivosun-inline-booster-duct-fan-4-100-cfm-hvac-exhaust)

## Best For

- vivosun enthusiasts

## Why This Product

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

## Key Features

- • **Built to Endure:** Durable steel housing and dual ball bearing motor ensure maintenance-free, long-lasting performance.
- • **Smart Safety Features:** Overheat protection automatically shuts off the fan, keeping your environment safe and worry-free.
- • **Whisper-Quiet Operation:** Enjoy superior airflow without the noise—operates below 30 dB, so your space stays peaceful.
- • **Powerful & Compact Airflow:** Boost your ventilation with 100 CFM in a sleek 4-inch design—perfect for tight spaces.
- • **Versatile Ventilation Solution:** Ideal for basements, bathrooms, kitchens, grow tents, and more—upgrade any space instantly.

## Overview

The VIVOSUN Inline Booster Duct Fan delivers a robust 100 CFM airflow at 2935 RPM while maintaining ultra-quiet operation below 30 dB. Its durable steel housing and permanently lubricated dual ball bearing motor guarantee long-lasting, maintenance-free use. Designed for versatile indoor applications—from grow tents to kitchens—this compact 4-inch fan features smart overheating protection for safe, reliable ventilation in any tight space.

## Description

Buy VIVOSUN Inline Booster Duct Fan 4” 100 CFM, HVAC Exhaust Ventilation Fan with Low Noise for Basements, Bathrooms, Kitchens, Attics, Grow Tents, Black: Everything Else - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: It works for me in a harsh environment. - I use this to extract heat from a portable A/C unit. I needed a fan with metallic blades due to heat. The heat it is exposed to will warp plastic fan blades. I was worried about the fan motor’s exposure to heat as well. This fan (in my application) is exposed to 145 degree internal duct heat for hours at a time which is right at the end of the motor’s advertised tolerance. It has been working without issues for over two months in Florida weather. I run it for as long as 6 hours straight, as needed. I use this fan to extract exhaust heat from a portable 9000 BTU A/C unit in my garage. This unit may also have use in a hurricane aftermath scenario (as in cooling a tent erected inside the house for sleeping (powered by a gas generator located OUTSIDE), if the power is out for weeks. This fan is hard mounted to a plate which I fabricated which seals the window opening completely. It can be removed from the window in less than 30 seconds. It also locks the window to help avoid entry from outside. I insulated the original flex duct with commercial grade insulation material used for A/C ducts in attics. The portable A/C unit is connected to the insulated duct, and then to this fan assembly at the window plate on the other end. The straight 4 foot duct run has two 45° elbows... this fan creates a vacuum in the duct to draw the heat outside better than the A/C u it could before. These portable A/C units are completely useless unless you facilitate the extraction of the heated air they produce. The uninsulated plastic exhaust ductwork they come with simply transfers all the heat the create right back into the room before it gets outside. It’s so hot in fact, it melts and distorts the window mount that comes with the A/C unit, allowing the heated air to literally blow back into the space you are trying to cool! It would heat and cool the garage simultaneously. Incredibly stupid and costly. To remedy, I insulated the exhaust duct from the A/C unit all the way up the the fan (at the window plate) in order to keep the heat in the duct, and not let it radiate back into the garage airspace. This fan sucks the hot air out. The window/fan mounting plate is made of 3/8 finish grade plywood, and painted with a two part epoxy, as to be waterproof and look nice. The fan is mounted to the plywood with a metal ring I fabricated using rivets, and it seals with a gasket. Control of the fan is manual, via the same power strip that supplies the A/C unit. The sound level is lower than the A/C unit’s noise output. The result: My garage can now reach 78°, with a 50% humidity level on a July day like today. Without the AC, the garage is 85% humidity, and 95°F.
Review: A little loud but they move air - I bought these to blow air up through new vents that I installed over my wood stove in the basement. The basement would get way too warm and the upstairs was too cold. I cut new vents through the floor and installed new duct work with these fans just before the floor vent. They blow so much warm air upstairs it is unbelievable. My only complaint is that they are a little loud but my main floor is now a comfy 70 degrees F and my basement is still a cozy 75 F. Would definitely buy again.

## Features

- Built to Last: The inline booster fan has a strong motor which features a permanently lubricated, dual ball bearing that operates quietly and requires no maintenance; The quality steel housing makes it sturdy and durable
- Compact But Efficient: This duct fan is compact and lightweight enough to be installed in areas with little available space; With a diameter of 4 inches, speed of 2935 RPM and 100 CFM airflow
- Low Noise: Superior balanced centrifugal impeller for long service life & quiet operation; A less than 30 dB noise level does not have any harm and will not disturb your life
- Safe Operation: Max Operating Temp of Motor is 135℃/275℉; Max Ambient Temp is 60℃/140℉; Featuring overheating protection, the unit will automatically shut off if overheating is detected
- Wide Applications: You can have it in bathrooms, kitchens, workshops, basements, attics and etc, in order to boost airflow in HVAC systems; Also, it can be used in grow rooms as intake fans or exhaust fan
- To maintain optimal performance of the exhaust fan, clean the fan after the first week of use with the carbon filter connected, and then clean regularly based on usage conditions

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CB8FQ567 |
| Air Flow Capacity | 100 Cubic Feet Per Minute |
| Best Sellers Rank | #2,005 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #3 in Hydroponic Ventilation Equipment |
| Brand | VIVOSUN |
| Color | Black |
| Control Method | Touch |
| Customer Reviews | 4.2 4.2 out of 5 stars (15,388) |
| Date First Available | July 6, 2023 |
| Efficiency | 7.14 CFM/W |
| Electric fan design | Blower |
| Finish Type | Painted |
| Indoor/Outdoor Usage | Indoor |
| Is Cordless? | No |
| Item Weight | 1.87 pounds |
| Item model number | VSV-IFA4 |
| Manufacturer | VIVOSUN |
| Model Name | VSV-IFA4 |
| Noise Level | 30 Decibels |
| Number of Power Levels | 1 |
| Power Source | Electric |
| Product Dimensions | 6"D x 4"W x 4"H |
| Recommended Uses For Product | Exhausting |
| Room Type | Kitchen |
| Size | 4" |
| Special Feature | durable |
| Speed | 2935 RPM |
| Style | Basic |
| Wattage | 14 watts |

## Product Details

- **Brand:** VIVOSUN
- **Color:** Black
- **Electric fan design:** Blower
- **Mounting Type:** Wall Mount
- **Power Source:** Electric
- **Product Dimensions:** 6"D x 4"W x 4"H
- **Recommended Uses For Product:** Exhausting
- **Room Type:** Kitchen
- **Special Feature:** durable
- **Style:** Basic

## Images

![VIVOSUN Inline Booster Duct Fan 4” 100 CFM, HVAC Exhaust Ventilation Fan with Low Noise for Basements, Bathrooms, Kitchens, Attics, Grow Tents, Black - Image 1](https://m.media-amazon.com/images/I/71oc5K9czOL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ It works for me in a harsh environment.
*by J***C on July 18, 2019*

I use this to extract heat from a portable A/C unit. I needed a fan with metallic blades due to heat. The heat it is exposed to will warp plastic fan blades. I was worried about the fan motor’s exposure to heat as well. This fan (in my application) is exposed to 145 degree internal duct heat for hours at a time which is right at the end of the motor’s advertised tolerance. It has been working without issues for over two months in Florida weather. I run it for as long as 6 hours straight, as needed. I use this fan to extract exhaust heat from a portable 9000 BTU A/C unit in my garage. This unit may also have use in a hurricane aftermath scenario (as in cooling a tent erected inside the house for sleeping (powered by a gas generator located OUTSIDE), if the power is out for weeks. This fan is hard mounted to a plate which I fabricated which seals the window opening completely. It can be removed from the window in less than 30 seconds. It also locks the window to help avoid entry from outside. I insulated the original flex duct with commercial grade insulation material used for A/C ducts in attics. The portable A/C unit is connected to the insulated duct, and then to this fan assembly at the window plate on the other end. The straight 4 foot duct run has two 45° elbows... this fan creates a vacuum in the duct to draw the heat outside better than the A/C u it could before. These portable A/C units are completely useless unless you facilitate the extraction of the heated air they produce. The uninsulated plastic exhaust ductwork they come with simply transfers all the heat the create right back into the room before it gets outside. It’s so hot in fact, it melts and distorts the window mount that comes with the A/C unit, allowing the heated air to literally blow back into the space you are trying to cool! It would heat and cool the garage simultaneously. Incredibly stupid and costly. To remedy, I insulated the exhaust duct from the A/C unit all the way up the the fan (at the window plate) in order to keep the heat in the duct, and not let it radiate back into the garage airspace. This fan sucks the hot air out. The window/fan mounting plate is made of 3/8 finish grade plywood, and painted with a two part epoxy, as to be waterproof and look nice. The fan is mounted to the plywood with a metal ring I fabricated using rivets, and it seals with a gasket. Control of the fan is manual, via the same power strip that supplies the A/C unit. The sound level is lower than the A/C unit’s noise output. The result: My garage can now reach 78°, with a 50% humidity level on a July day like today. Without the AC, the garage is 85% humidity, and 95°F.

### ⭐⭐⭐⭐⭐ A little loud but they move air
*by N***E on November 21, 2025*

I bought these to blow air up through new vents that I installed over my wood stove in the basement. The basement would get way too warm and the upstairs was too cold. I cut new vents through the floor and installed new duct work with these fans just before the floor vent. They blow so much warm air upstairs it is unbelievable. My only complaint is that they are a little loud but my main floor is now a comfy 70 degrees F and my basement is still a cozy 75 F. Would definitely buy again.

### ⭐⭐⭐⭐ it works well, but it is not quiet by any stretch of the imagination.
*by K***C on January 4, 2026*

the fan moves a lot of air, and the speed control is reasonably linear allowing for smooth speed adjustments thought-out its range without any spots that seem to not make much difference. it doesn't come with any means of attaching or hanging it at all, no strap, nothing!!! i grow veggies in the tent rather than weed like most here so i have no need for a carbon filter and a strap or mounting bracket would of been a nice addition. it's reasonably light weight so i installed it into one of the vent openings of a grow tent and just used the synch cords to secure it, it works well. i have it just to help with heat removal in the top of the tent when the lights are on, i keep the lower vents of the tent open all the time so there's a bit of natural thermal lift, but on hot days i had a little more temp climb than i liked. i have noticed that the room i have the tent in gets a good bit warmer with the tent venting into it so i have a 16ft 6" hose and it fit the fan perfectly, and i'll get a window vent to vent the heat outdoors. other than it being a bit noisy, it's a great addition to the grow tent.

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-03*