Ventilation of underground car parks requires powerful units designed for continuous operation. This circumstance gave rise to the use of two fan types: centrifugal and axial with straight blades ones. The fans of medium and large capacity are installed in separate engine rooms. The air intake should be implemented at a distance from pollution sources.
Rainwater hoods as a complex of car parking ventilation system installation
Depending on the type of the construction it may be necessary to carry out the organisation of the rainwater in addition to installing the car park ventilation system. The installation of a true to type rainwater hood requires solving a number of problems. The exhaust grilles should be located above the level of the roadway and sidewalk. The exhaust air flow rate should be sufficient to ensure rapid dispersion of pollutants in the atmosphere; the recommended rate should be at least 10 m/sec. The exhaust ducts must be sealed against the ingress of rainwater, especially in vertical ducts connected directly with fans.
Noise pollution nuances
An average covered car parking ventilation system has a tremendous impact on the level of noise. Due to the high level of noise near the car parking lot, created by supply and exhaust fans in conjunction with an exceptional sound reflecting ability of the materials utilised in construction, the sound of the approaching car is not always clear, which represents particular risk to people passing by the parking area. In this regard, in order to ensure the safety of the installation, the silencing mechanism are typically mounted.
By the way, an additional risk factor is represented by dim lighting; however, with the introduction of LED technologies, boasting its cost-efficiency and effectiveness, the problem seems to be partially solved.