3. What size window will the W5 fit into? JB Hyppolite July 13, 2020 18:40 Updated Our patented window frame adapter can be adjusted to fit windows 22'' to 36'' wide. (Image Coming Soon) Related articles 4. How do you install the W5? 5. Must I remove my window screen before installing the W5? 2. How many BTU is the Kapsul W5 and how many sq ft does it cover? 6. How far will the W5 protrude from the window outside? Kapsul Is Finally Here In Time For Summer Comments 0 comments Article is closed for comments.