Thank you for your inquiry to Drs. Foster and Smith. Unfortunately, we do not have a gate that can extend or fit a 20 foot opening. The closest gate that would meet your needs is the Design Studio Freestanding & Pressure Mount Extra Wide Pet Gates 28" high, 9N-84205. You would need to use more than one as they only extend out to 70” wide. This would weaken the strength of the gate. We apologize that we could not help you with your needs at this time. Please call us at 1-800-381-7179 with any further questions.