Measure the height of your sliding glass door track
Don't just assume that 'it's standard' as they do vary. Using a ruler, measure inside the track, very top to very bottom. Always compare your track height to the adjustment ranges shown for the various pet doors. Endura Flap offers custom heights for odd-sized sliders and windows. Most others don't.
Measure the inside of the track with measuring tape or a ruler from the deepest part up inside the top track and down into the deepest part down inside the bottom track. Don't assume that it's a "standard" size track, it's very important to have accurate measurements. Always compare your track height to adjustment ranges shown for the various dog doors. Endura Flap offers custom heights for odd-sized sliders and windows.
A NOTE OF CAUTION when measuring your track height:
Even though your measurement falls within the adjustment range of the sliding glass doggie door you have chosen, you could still have a problem if you are at the shorter end of that range. You will probably require some clearance to get the pet door up and over the track wall at the bottom and into the track!
You should measure the height of the lowest track wall at the bottom (usually the outside). You'll need enough compression to clear that height. Please call our customer service at 1-800-826-2871 if you have any question about this. Endura Flap pet door patio dog doors have special provision for decreasing or increasing the adjustment range a small amount (about 3/4") on the job site. This feature can save having to ship the pet door back in case of a small measurement error.