Balelic US-TSFJ 4-Inch Inline Duct Fan with Speed Controller

The Balelic US-TSFJ is a 4-inch inline duct fan with a stepless speed controller on its power cord. Its listed 200 CFM airflow and compact dimensions suit buyers looking for adjustable indoor ventilation, though the airflow and noise figures are listing claims rather than independently verified measurements.

At a glance

The listing states 200 cfm airflow and 2550 rpm.
A cord-mounted stepless controller is described for adjusting airflow.
Removable duct ends with locking tabs are described for maintenance and installation.
The listing gives a 4-inch size and indoor use.

Price

$29.99Save 33%

Reference price: ~~$44.99~~

Price checked: Nov 14, 2026

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Pros and cons

Pros

Stepless speed adjustment gives users flexibility to set airflow rather than relying on a single listed speed.
Removable duct ends with locking tabs are intended to simplify access for maintenance.
The listed dimensions can help assess fit in a compact installation.

Cons

No independently verified airflow or noise performance data is supplied, so the listed figures may not predict results in a specific duct setup.

Technical specifications

18 specifications

Identity
Brand	Balelic
Model	US-TSFJ
Fan design	Blower
Color	Black
Style	Classic

Airflow and operation
Airflow capacity	200 cfm
Speed	2550 rpm
Noise level	31 db
Control methods listed	Push Button
Speed adjustment	A stepless speed controller on the power cord enables the fan to run at different speeds; With this speed switch, you can adjust it to the desired. airflow level.
Usage	Indoor

Power and electrical
Power configuration	ac
Wattage	40 watts

Dimensions and installation
Dimensions listed	11.4"D x 4"W x 7.9"H
Size	4 Inch
Installation details	removable duct ends with locking tabs for quick removal and easy maintenance. Universal mounting bracket for direction of airflow indicating.This duct fan is compact and lightweight so it can be installed in small areas.

Materials
Material listed	Alloy Steel
Blade material described	Durable plastic fan blades

What to know before buying

Listing details to confirm

The listing is inconsistent about materials: the technical details say Alloy Steel, while feature text describes carbon structural steel and plastic fan blades. Noise is listed as 31 db, while promotional wording claims less than 31 dB. Confirm the material and expected noise level if these details affect your choice.

Who is it for?

A good fit for

Indoor ventilation in a 4-inch duct where adjustable airflow is useful.
Buyers who want a compact blower-style fan for a greenhouse, planting tent, kitchen or bathroom, as suggested by the listing.

Less suited to

Outdoor use, since the listing specifies indoor usage.
Buyers who need independently verified airflow, sound levels or construction materials.

Balelic US-TSFJ 4-Inch Inline Duct Fan with Speed Controller · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.3 / 5 · 12 ratings

5 stars58%58%
4 stars19%19%
3 stars23%23%
2 stars0%0%
1 star0%0%

Aggregate ratings are generally favorable but include a notable middle rating share, and the sample is small. They do not show what buyers liked or disliked. For a fan whose listed airflow is 200 cfm and whose speed is adjustable, these ratings alone cannot confirm performance, noise or build quality in a particular installation.