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Carpark Ventilation and Exhaust System Installation and Ways for Efficiency

07 December 2020

Ventilation and exhaust systems must be installed properly since they can effectively help in extracting the smoke and gas from car parks. They also help in maintaining the fresh supply of air and prevent toxic elements from accumulating in specific areas. And in case of an emergency, these systems can easily help people evacuate the area as they reduce the temperature and maintain visibility of the area.

The installation of ventilation and exhaust systems hugely relies on the amount of carbon monoxide that is present in the car park space. Once this element is determined, the whole system can now be designed to properly regulate the airflow on the car park.

When it comes to designing and installing efficient car park ventilation and exhaust systems, various elements must be defined thoroughly. Some of these elements are as follows:

Required Airflow Rate

There are various methods that can be used in calculating the required exhaust airflow rate. For carparks with more than 40 spaces, some calculations that can be used are a) 2000 x F x T Litres/s, b) 0.85 x P x (100 x n1 + n1 x d1 + n2 x d2) x E x T, and c) 2.5 x A Litres/s. The calculations used for carparks with less than or equal to 40 spaces are a) 2000 Litres/s, b) 2.5 x A Litres/s, and c) 400 n1 x P Litres/s.

The supply air flows must range from 75% to 90% of the exhaust air quantity. All the parameters values of these calculations are provided in AS 1668.2, which determines the standards required for constructing and designing all elements found in car parks.

Proper System Selection

The system selection for ventilation and exhaust systems would hugely revolve around numerous factors. Some of these factors include spatial requirements, size of the car park, the location of supply and exhaust discharge, simplicity and maintenance access, and overall cost.

Ventilation Distribution

When designing the ventilation system of the car park, there are numerous steps that must be followed. First, the supply and exhaust ducts must be situated on opposite sides of the car park. Afterwards, the vents should be placed approximately 6 metres apart. The lines of direct air paths between the supply and exhaust vents must be clearly identified.

The next step in designing the ventilation system is to mark areas that are covered within 3 metres of direct air paths. Make sure that there are no zones more than 7 metres away from the direct air path. Areas that are not covered by 3 metres border of air paths must be subsequently marked. With appropriately sized ducts, they should keep the velocity to less than 7 m/s for vibration purposes. An additional 25 mm above and below for flanges must likewise be allowed. Clearances must be checked before creating and finalising the rough digital sketch of the system.

Discharge Requirements

The exhaust of the car park must be vented at least 3 metres above the ground. It must also be situated 6 metres away from the walkway or adjacent properties. The supply air intake and exhaust point, alternatively, must be set at a minimum of 6 metres apart, especially for discharges of over 1000 L/s.

Considering these elements properly can easily make car parks safe. If you want to have your car park ventilation and exhaust systems, feel free to give us a call at Red Rock Contracting.


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