The Lasko twin window fan will keep you cool both day and night. It fits most windows (double-hung, casement or sliding) from 22" to 32". The expandable panels of this fully assembled unit provide a custom fit for your window space. The fan can be positioned for intake or exhaust and the slim profile ensures that the outdoors is still within view. Twin window fan fits windows from 22" to 32" Fully assembled and ready to install in your window Expander panels for a custom fit Slim profile to maintain outside view Snap-on feet included for table or floor use Built-in carry handle for easy handling Positioned for intake or exhaust functions 2 quiet, energy-efficient speeds Blue Plug patented safety fuse technology ETL listed Approx. 21-3/4"W x 5-1/4"D x 10-1/4"H