The Innerglass Interior Storm Window is mounted on the inside of the stops of the primary window, where it seals tightly, eliminating drafts and condensation problems. It conforms to the window opening and pops in & out easily without tools.

Inside Storm Window Installation Video

Interior Storm Window Installation Video

Cut the header channel to fit inside the top of your window frame and secure the channel in place.
Squeeze the compression sides in to insert the top of the window into the header channel, then continue pressing the sides in from top to bottom as you push it in place.
Drill a 3/32″hole on each side in front of the window about 1/3 of the way up from the sill and insert the blocking pins.