Therefor when you place your order for the item, be sure to indicate in the comments field of the next longest piece or pieces, the net length that you want the item manufacturered at. We will be sure to ship it out at that net length.
Having said that he will want to be sure to measure the door correctly based on the type of automatic door bottom you are ordering. What I mean is that a surface mounted model would be measured differently than a mortise style model.
If you have any questions regarding exactly how to measure the door and the ultimate net size that you need for your automatic door bottom please reach out to us prior to placing the order so that we can eliminate all guesswork and work towards you ordering the proper net size at the time of order.