Staircase Pressurization Duct

It depends on the volume of staircase and area of leakage or normally its in. In the united states additional hose stream testing only for a separate firestop test with only a 30cm or 1 length of duct exposed is required to achieve product certification. Stair pressurization due to the relative cost of the associated mechanical systems and architectural space issues related to providing exterior balconies and stair vestibules the stair pressurization system is the most widely selected design option.
staircase pressurization duct

Motor class f up to 750 w protection ip 65 more than 750 w ip 55.

Typically used in protected stairways lobbies corridors and fire fighting shafts a pressurisation system is a special form of mechanical ventilation which maintains a positive pressure in critical areas to prevent smoke entering from adjacent areas.

Staircase pressurization duct. Staircase pressurization fan. Box made from galvanised metal sheet with insulation class m1. Pressurisation ductwork is the ductwork used as part of a pressurisation system. Typically pressurisation ductwork is subjected to demonstrable product certification on the basis of fire testing for example iso 6944.

Chapter 7 mechanical ventilation and smoke control systems 711 general a where air conditioning system is provided in lieu of mechanical ventilation system during emergency all the requirements specified in this code for the mechanical ventilation system shall apply to the air conditioning system. The staircase pressurization system is made of a axial fan box frequency converter and air sensor pressu re. Stairways are fire escape routes nowadays stairwells have better fire ratings than the rest of the building. In case of fire in a high rise building a stair pressurization fan spf uses clean outside air to pressurize the air in stairwells.

Static can be calculated by adding all friction losses in the duct if applicable the air outlet which has been taken into the consideration the pressure which is needed to be maintained if any dampers or specific. Pressurization systems emerged as a popular design solution initially in the us a country where there is a strong manufacturing and servicing base for mechanical systems coupled with legislation to ensure that building owners maintain life safety buildings. Staircase pressurization fire rating lilliput1 mechanical 4 aug 16 1550 consider adding a recirculation duct with stairwell pressure controlled automatic damper to direct part of the discharge air back to fan inlet ductwork. Stairwell pressurization systems.

Thermoplastic impeller with ajustable pitch angle with the exclusive mns. The pressurized air helps people escape the fire and firefighters battle the fire. At the same time excessive air flow to the staircase must be prevented so that children or less able occupants can open the access door to the staircase during an evacuation. A system must be installed which is capable of automatically and safely supplying the two air flows.