This is such a sweet design. The perfect balance between performance and cost savings. The roll to peak light dep is a much more resilient system than a traditional accordion style curtain system. Placing the roll to peak on the inside of the greenhouse protects it from the elements which is the major draw back to external deps. Sealing off the inside growing space and ducting the air through the two sets of endwalls creates an ideal growing environment and saves a TON of fuel. I would give this 6 out 5 stars!