Fanroomless ventilation system for an underground parking lot

Underground parking lot emits CO, with its known risks. In order to dilute CO to acceptable level, the ventilation system of underground parking lots can be designed as duct system, ductless system, or combined. Regardless of which system design is chosen, the mechanical rooms should be considered in planning the system. If larger fans are installed to meet code requirements, initial construction costs for the mechanical room will be increased in a traditional system accordingly. On the other hand, the FANROOMLESS ventilation system can meet the code requirements without supply fan room. Furthermore, the outside air is supplied to the premises at high speed by air jet in the required direction. The air jet provides the air supply with impulse that causes the supply outside air to be carried onwards with low noise and low energy consumption. On top of this, FANROOMLESS system can save an extra parking space of 27.9 m(2) per flat in case of an area 9,000 m2 compared to a traditional ductless system. Additionally, this paper suggests a flat exhaust rate (m(3)/h) per square meter depending on the types of facility based on actual calculations over 10 years through various types of building using correlation equations and experience.