13-53" Vertical Window Exhaust Fan for Sliding Windows, Punch-Free Installation, 4" Retractable Variable Speed for Livingroom & Bathroom(15.75-17.72in)

1. Tool-free installation: Designed for vertical installation of sliding windows, the adjustable spring frame requires no tools or drilling, ensuring a tight, sealed fit and completely solving the problem of loose window sashes common in ordinary windows. Even beginners can install it quickly.2. Powerful yet quiet: A powerful 2800 RPM speed operates with low noise. 10-speed stepless adjustment allows for flexible wind speed switching, suitable for various scenarios such as offices and homes, quickly refreshing indoor air.3. Weatherproof design: Two-way operation with forward and reverse rotation, freely switching between intake and exhaust, usable year-round; the aluminum alloy frame and stainless steel mesh cover are removable and washable. The 4cm slim body does not obstruct window opening.4. Versatile: Effectively removes cooking fumes and odors, dehumidifies and ventilates, suitable for apartments, offices, studios, and other spaces. As a replacement for household fans and air conditioner fans, it quickly improves air quality.5. Universal installation: Compatible with most sliding windows, it can be installed vertically and flexibly. Compact and space-saving, it boasts the performance of a large exhaust fan. An installation guide is included to ensure perfect fit and easy installation.

• Precise Fit for Sliding Windows: Custom-designed for sliding windows with inner frame heights of 13"~53" using a 1.97-inch telescopic spring. Please measure the vertical window frame height (not glass height) before installation.
• Stable and Efficient Ventilation: The aluminum alloy frame securely clamps the window frame, effectively improving air quality in pet rooms, smoky environments, and poorly ventilated rooms, enhancing living comfort.
• Tool-Free Installation: No tools or drilling required. Quick installation; simply pull out the spring frame, insert it into the window frame, and tighten the fasteners. Removable at any time without damaging the window.
• Safe and Durable: The slim design is flush with the window frame, not affecting normal window opening and closing. The stainless steel mesh cover combined with a powerful fan ensures both safety and durability for long-term stable use.
• Seasonal Compatibility: Equipped with a stepless speed controller, allowing for free adjustment of wind speed, switching from a gentle breeze to a strong breeze to meet the ventilation needs of different seasons and scenarios.