Amazon B07GF58DXB Manual page 6

Installation
Step 2: Header Board Installation
Door height + 1.75" (44 mm)
NOTICE
1. Locate and mark the center of the 1 x 6.
2. Using the center line of the header board, line it up to the stud marks.
3. Using interior screws, mount the header board to the wall.
NOTICE
6
Floor
Draw a straight vertical line of at least 3.5" (89 mm), going through the mark
that you made for the stud location.
Use a level to ensure the header board is level when installing it to the studs.
Keep level
2" (51 mm) minimum
on one side of the
door
Door opening
Header board
(1 x 6 recommended)
Floor clearance:
Using the dimensions
shown will allow for a
3/8" (9.5 mm) space
between the door
and floor.