Andway Evacuation Sheet Description The evacuation sheet fixes permanently to the bottom of any foam mattress. Safety belts have been included to strap the patient to the device. Rescue straps are included to assist rescuers. Will pass easily through doorways and down stairs. Two people required.esigned to be used with a flexible foam mattress...... ;; Andway Evacuation Sheet Description The evacuation sheet fixes permanently to the bottom of any foam mattress. Safety belts have been included to strap the patient to the device. Rescue straps are included to assist rescuers. Will pass easily through doorways and down stairs. Two people required.esigned to be used with a flexible foam mattress......