Amazon Basics Twin Window Fan for Home Bedroom, 9 inch, Reversible Airflow, Exhaust Mode, Expandable Side Panels, Width Adjustable, 2 Speeds, Air Circulation, 68W, White

similar products:

shinic 9" Twin Window Fan with Reversible Airflow – Quiet Exhaust & Intake, Independent Control Dual Fan, Expanders for 23.8"-37" Window, Vertical/Horizontal for Sliding Window, for Home Kitchen

comments:

voretaq7 posted on r/diy2w

You could just buy a fan with simple switch controls - I assure you they still exist, the links I gave are for Amazon US but I'd be shocked if you can't find them in other countries!

shinic 9" Twin Window Fan with Reversible Airflow – Quiet Exhaust & Intake, Independent Control Dual Fan, Expanders for 23.8"-37" Window, Vertical/Horizontal for Sliding Window, for Home Kitchen