All set up for 2 months with this bad boy prior to PPM... and yes, I have the 21k adapter.
Everest Summit II Hypoxic Generator
Newly designed for enhanced portability, usability, comfort and quietness, this generator represents the top of the line in hypoxic technology. The Summit II comes standard with digital controls.
• Unsurpassed 7600 L/hr. airflow for extreme comfort
• 0 - 21,000ft/6,400m
• Built in wheels and handle
• Works with altitude tents, altitude workout systems and IHT / Wellness Systems
• Size: 26.0" H x 14.7" W x 19.1" Deep / 58.4cm H x 39.4cm W x 47.0cm Deep
• Weight: 57lbs / 26kg