Drain and leave valve open. Clean, leave open. Tape vent closed. Close all drapes or blinds. Altitude adjustment advice .
Higher altitudes affect most people to some degree.
It's normal to get out of breath easily - especially infants and the elderly. At a 9,000-foot elevation, oxygen levels are about half of what they are at sea level. Many people experience mountain sickness from low oxygen, symptoms such as nausea, headaches, dizziness, gasping for breath, or fatigue. Try these tips from the Rocky Mountain Travel Guide . The first few days, limit exposure to higher elevations.