Window Frame Adapter Installation Guide Bella August 31, 2020 22:08 Updated *Editorial Note: The Window Frame Adapter will only fit in single or double-hung windows that have an opening of 22''-36".* Related articles Kapsul Operating Manual & Safety Guide How Do I Assemble The Knobs To My Window Frame Adapter? Kapsul Is Finally Here In Time For Summer Why Does My Kapsul Turn "On and Off?" Latest Update: I backed you on Kickstarter or Indiegogo. Can I get a refund? Comments 0 comments Article is closed for comments.