Manufactured home subdivisions shall be required to provide a storm shelter for the protection of all residents. Storm shelters shall provide four square feet of floor area per resident, have sufficient ventilation, and have a generator of sufficient size to provide power for heat and light. Windows are permissible if provisions are made for their protection by shutters or other similar devices that are designed for immediate installation in the event of sudden emergency. The storm shelter may be used for recreational purposes, laundry facilities or other purposes.