Installation Page 4:

7 - You must now determine the placement of the self-adhesive  flat bars that will connect your A-Plus Pet Screen Door to your host screen. This will most likely be on the body side of both host and pet screen.

(Note: The screen side of the pet screen must face the same direction as the screen side of the host screen.)

Once you have determined which side you will place the flat bars, and have determined the proper positioning, you may then carefully adhere the flat bars into place. See Figure 4

If necessary, use holes and screws to better secure.

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Figure 4