Specification for the Colt Car park ventilation system

Manufacturer
Colt International Limited
New Lane, Havant, Hampshire. PO9 2LY
Tel. 023 9245 1111
Fax. 023 9245 4220

Description
The car park ventilation system shall comply with the airflow requirements of Approved Documents F and B (2000) to the Building Regulations.

This requires an airflow rate of at least 6ACH under normal conditions and 10ACH under fire conditions.

The system shall comprise:

natural inlet through the entrance/exit ramps/fixed ventilation louvres.
extract by a ducted system with dual fans discharging to atmosphere
air distribution and mixing within the car park by a network of Colt Jetstream Impulse Fans/ Colt Cyclone Induction Fans.

Natural inlet shall be sized for a maximum air velocity of 3m/s with the system in fire mode.

The extract system shall be split into 2 parts, each providing 50% of the total airflow required.

The extract points shall be, as far as practicable, on the opposite side of the car park to the air inlet.

The extract fans shall be rated at 300°C for 60 minutes. All ductwork passing through other compartments shall be fire rated for a period of 30/60/90/120 minutes. Ductwork within the car park shall be constructed from materials having a melting point above 800°C.

The location of the impulse/induction fans shall be arranged to ensure good mixing of air in normal day to day mode and effective clearance of smoke in fire mode.

The impulse/induction fans shall be rated at 300°C for 60 minutes. The fans shall be supplied fully assembled with all necessary attenuators, guards and guidevanes.

Where the car park is on a single level both the extract and impulse/induction fans shall be two speed units to provide the required normal and fire mode airflow rates. Where the car park is on more than one level the exhaust fans may be single speed, with dampers being used to close inlets on the non-fire floor and provide the increased airflow rate on the fire floor.

Power to the car park ventilation system shall be provided from a maintained supply and cables shall be fire resistant. The maintained supply (by others) shall terminate in a changeover panel close to the control panel location. All wiring from this point shall be the responsibility of the system supplier.

Day to day control will be via a Carbon Monoxide detection system, to be supplied as part of the Car Park Ventilation Works. At CO levels of 0-20ppm the extract shall run at 3ACH and the impulse/induction fans shall remain off. At levels of 20-30ppm the extract shall run at 3ACH and the impulse/induction fans shall run at low speed. At levels of 30ppm and above the extract shall run at 6ACH and the impulse/induction fans shall run at low speed.

In fire mode the system shall operate at high speed. Fire mode shall be activated by a signal from the building fire detection system/a dedicated fire detection system incorporating smoke/heat detectors in the car park and supplied as part of the car park ventilation system. The operating sequence in fire mode shall be that initially the extract fans are switched to high speed and the impulse fans are switched off. After an agreed escape period (typically 5 minutes) the impulse fans are switched back on to high speed.

The control panel or a mimic panel for fire service use shall be mounted in a position accessible to and agreed with the fire service and shall incorporate status indication and manual override for fire service use.

A full design report including all calculations and CFD analysis shall be provided for submission to Building Control prior to installation.

One Specialist Company and their approved sub-contractors shall carry out the design, manufacture, installation, wiring and commissioning of the complete system, including associated ductwork. The Specialist Company shall be responsible for demonstrating and gaining Building Control approval for the ventilation system.

The specialist company shall be a BSI registered firm for the design, manufacture, installation and commissioning of smoke control systems in accordance with ISO 9000. Proof of certification shall be provided with tender submission.

The system will require annual maintenance and testing. The supplier shall include in the tender for a service visit and system test to be carried out one year after the system hand over.

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