GSKFXJ Reversible Vertical Window Fan Review: Slim and Quiet for Sliders
GSKFXJ's 1.57 inch thick vertical fan locks into a sliding window track, reverses and runs on a quiet DC motor.
By Daniel Brooks
Updated October 28, 2026
The GSKFXJ Reversible Vertical Window Fan is a 1.57 inch thick vertical fan that locks into a sliding window track, switches between exhaust and intake and runs on a quiet DC motor. For more models, see our Window Fans page.
Our Verdict
This is our top vertical fan for sliding windows: slim, reversible, quiet and waterproof.
You must buy the right size, and it moves less air than a twin fan.
GSKFXJ Reversible Vertical Window Fan
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Key Specifications
| Feature | Specification |
|---|---|
| Brand | GSKFXJ |
| Model | Vertical Window Fan |
| Thickness | 1.57 inches |
| Modes | Exhaust and intake |
| Motor | DC |
| Noise | Ultra-quiet (per GSKFXJ) |
| Weather | Waterproof |
| Fit | Sized to sliding window frame height |
Design
It locks into the sliding window frame and is waterproof for rainy weather.
It comes in sizes matched to window heights; measure the track first.
Controls
A dual-mode design switches between exhaust for kitchen fumes and intake for fresh air.
GSKFXJ says the DC motor is quiet enough to act as white noise in a bedroom.
Placement Tips
Measure the window before you install and close any gaps with the expanders or foam provided, so the fan moves air through the blades rather than around them. Use the window lock or a stop if you leave it in an accessible window.
For a cross breeze, run this fan on intake in a window on the cool, shaded side of the house and open a window on the opposite side, or set it to exhaust upstairs to pull cool air in below.
Running Costs and Care
Unplug the fan and wipe dust from the grilles and blades every few weeks during heavy use. Dust buildup cuts airflow and adds noise.
Bring it in or close the window in heavy rain unless the listing says it is weather resistant, and store it clean and dry over winter.
How It Compares
Against the Wnanch Slim Vertical Window Fan, both reverse; the Wnanch adds a stainless steel screen and covers more sizes.
Against twin fans standing in a slider, the GSKFXJ leaves no big gaps but moves less air.
Pros and Cons
| Pros | Cons |
|---|---|
| Ultra-slim | Must order the right size |
| Reversible | Less airflow than twins |
| Quiet DC motor | Pricier than twins |
| Waterproof | Newer brand |
| Portable between rooms | Few listed specs |
Who Should Buy It
| Who Should Buy It? | Who Should Look Elsewhere? |
|---|---|
| Sliding windows | Hung windows |
| Bedrooms | Anyone needing strong cooling airflow |
| Kitchens | Tight budgets |
| Pet rooms | Unmeasured windows |
For more options, see our picks for the best vertical window fans for sliding windows and the best quiet window fans.
Final Verdict
The GSKFXJ Reversible Vertical Window Fan is a slim, quiet fan for sliding windows. You can check the current price and details for the GSKFXJ Reversible Vertical Window Fan.
Frequently Asked Questions
How thick is it?
1.57 inches.
Is it reversible?
Yes, exhaust and intake.
Is it waterproof?
Yes, per GSKFXJ.
What motor does it use?
A DC motor.
How do I choose a size?
Measure the inner frame height of your sliding window.
About the author
Daniel Brooks is a home cooling editor at WikiCooling, covering window, portable, through-the-wall and mini-split air conditioners, fans, and dehumidifiers. He researches cooling capacity, energy efficiency, noise levels, installation requirements, and buyer feedback to help homeowners choose the right unit for their room size, climate, and budget.