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A: Hi there. Thanks for reaching out. The Rough Cutout for the large flap is 12 5⁄8" w x 23 1⁄16" h and the outside frame dimensions are 13 9⁄16" w x 24". Regards, Endura Flap Customer Service
A: If you do get the wall unit it will come with the tunnel pieces that are assembled during the installation. The single flap version would have the the flap on the inside and you would have a trim frame to finish it off on the outside. With the double flap there is a flap on the inside of the house and on the outside. We do get questions on what happens with the single flap since the flap is on the inside regarding water and things collecting in the tunnel and running into the house. In order to prevent this from happening it was engineered so that the threshold on the trim frame is much lower than the threshold on the flap frame inside. This means that anything in the tunnel would run outside before it ran inside.