Note This drawing does not show garage door (below) , just the opening. Standing inside garage looking outside.
Measurement from floor to top of Header framing (orange arrow) must be at least 6 inches higher than your garage opening. Eg. Your opening is 7 feet High , you need at least 7' 6" so you can install Velcro onto wooden 2 x 6 across entire top of garage opening ( If height is not 7' 6" you have to install a 2" x 4" across entire width)
Measurement from door track bracket on left side to door track bracket on right side (blue arrow) should be at least 3 inches ( or more) wider than your actual garage opening Eg. Your garage opening is 9 feet Wide , you need at least 9' 3" across. Install Velcro from top to bottom of side frame just beside garage door bracket ( butt Velcro up to bracket)
Install pulleys at least 1 inch above velcro at top of header as shown
Please Note: Garage screen must be rolled up before closing your garage door to prevent screen from catching on garage door. !!!!