Ventilation under your mobile is essential for the longevity of the materials used to build your home. Without ample ventilation, the building materials are much more likely to become damaged by moisture, mold, and mildew. Installing one square foot of ventilation for every 150 square feet of living space in the home is recommended. Vents must also be installed within three feet of each corner to ensure proper airflow under your home. At least one access door is critical to ensure you can service plumbing and other components under your mobile home without damaging the skirting or removing panels.