We provide mechanical smoke ventilation solutions (SHEV) for a variety of applications, including:-
We install & commission a range of complete smoke ventilation systems (SHEV), and these can include mechanical systems such as the following:-
We provide mechanical smoke ventilation products and components certified to CE EN12101-3 for powered extraction systems for car parks, smoke shafts and roof extraction:-
Mechanical ventilation systems are usually deployed in buildings and structures where a natural smoke ventilation solution cannot be deployed or where they are are impracticable.
The advantage of a mechanical systems is the guaranteed nature of its performance - it will extract a known volume of air per minute consistently, making your fire strategy more straightforward.
The disadvantages are 1) cost and 2) aesthetics - natural smoke and heat exhaust systems (NSHEV) will often prove more cost effective and appear less intrusive to the building's design integrity. This is why we recommend early consultation in a project to provide the widest choice of options to conform to Building Regulations and controls.
There are times where nothing other than mechanical extraction will work - such as in certain multi-storey atria buildings (commonly required in fully open and partially open atria building types) where the volume of open space, smoke depth and smoke buoyancy will require assisted extraction.
Used on atria building types and warehouse type structures these extraction fans aid smoke and heat exhaust ventilation (SHEV).
We generally provide SHEV extraction fans certified under CE EN 12101-3 (powered SHEV systems) to either F300 (functional at 300°C for 60 minutes) or F400 (functional at 400°C for 120 minutes). Often they will be used in conjunction with smoke curtains to compartmentalise and control airflow (both exhaust and inflow).
Blowing high velocity air that entrains surrounding air, induction fans and impulse fans allow smoke and exhaust fumes to be moved to extraction smoke shafts without the need for any ducting (saving money and space). The 'jet' of high velocity airflow lowers air pressure (Bernoulli effect) consequently pulling large volumes of the surrounding higher pressure air with it - an elegantly simple and highly effective solution that reduces costs significantly!
Mechanical smoke shafts are usually deployed where an Approved Document B plan area of 1.5m2 cannot be achieved, or sometimes in higher building where up-venting and smoke buoyancy are not sufficient to allow smoke and heat exhaust ventilation to be successfully achieved. Smoke shafts are placed adjacent to common areas such as stairs, lobbies and interior corridors to vent smoke and heat. This provides improved safety for the evacuation of building occupants and better smoke-free access for fire fighters.
BRE smoke shafts are usually specified in taller multi-storey buildings (over 18m) and are designed primarily to protect fire fighting shafts. Often lobby fire doors might have to be wedged open to allow fire hoses access, which means the smoke shaft by necessity has to compete with greater inflow volumes in the fire fighting shaft, and therefore a BRE 79204 smoke shaft has a plan area of 3m2. However, utilising a mechanical system this space can be reduced by up to 80%, at just 0.6m2.