Features:

• Designed and Safe to Use in a Window
• Two Speed Settings
• Built in Extender Panel
• Bonus Extender Panel
• Fits Into Virtually all Double Hung and Slider Windows

Editor Reviews:

Product Description:
Twin fans with independent controls. Reversible motor to bring in cool air or exhaust stale air. 2 addtional extender panels for large window.

Rating : - Good item for the price
The fan is a very basic model.
Pros
- Easy to install and comes with a side panel to block the window opening
- Cheap
- Can be used for venting as well as getting air in
Cons
- A little noisy for the air that it pushes through (relatively low CFM for the noise level)
- Twin fans cannot be controlled independently
- Venting or getting air in is controlled manually by reversing the fan.