Underground Concrete Specifications
● Approximate Interior Size – 8′ x 6′ x 6′-1″ Tall
● Capacity 10 – 12 Person
● Reinforced Steel Door
● Hydraulic assisted door lift
● 6000 PSI concrete construction
● Steel rebar reinforcement in concrete
● Double handrail on steps
● 4  – Metal Steps
● Can be installed on flat or sloping lot
● Foundation coating applied to exterior below grade surfaces
● 8″ wind turbine for ventilation
● 6″ vent