FAQs

How it works

Can a naturally ventilated environment be comfortable for all occupants?

Yes with the appropriate control strategy it can. Comfort of a space is dependent on many variables such as the temperature, the amount of fresh air, the movement of air, the humidity etc. It also...

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Do I need to have a specific building design?

No, the e-stack system can work in a broad variety of building designs and uses. There are two design solutions for the e-stack system our roof mounted units and an atrium based system. The...

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Does Breathing Buildings have views on Passivhaus designs?

The Passivhaus building principles such as high levels of insulation and air tightness are properties a building should have. However, the ventilation system used on many Passivhaus schemes...

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Does it only work on the top floor?

No, natural ventilation can be used on multi storey buildings. You can either use our roof mounted solutions and provide shafts to the lower floors or use our atrium system. The atrium system...

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Does the system work in buildings that are not air tight?

Yes the system works in buildings which are not air tight. Of course, the e-stack works more efficiently in a tight building with controlled openings.

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How can you provide Natural Ventilation at a noisy site?

Yes, we have helped several clients with strict noise requirements using acoustic attenuation. The attenuation can be provided at low level, by putting acoustic baffles into louvres, form part...

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How can you provide Natural Ventilation when spaces have different noise levels?

If a room is open plan, then noise will be easily transmitted between zones, whatever the natural ventilation strategy. However if multiple rooms are present with dividing walls, yet share...

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How does purging a science room work with Natural Ventilation?

The purge requirement of BB101 requires that science rooms can have a ventilation rate of 10 air changes per hour. The purging strategy depends on the type of ventilation system in place and...

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How does the e-stack system work

During summer the e-stack usually acts as a high level outflow, with inflow provided by lower level openings such as windows. Using a stack increases ventilation rates above those for just...

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How much power do the units use?

Typical energy consumption of one unit is around 100W. CIBSE good practice energy consumption for classrooms is around 135 kWh/m2/year whereas with the e-stack system the typical...

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Is it true that you can avoid cold draughts?

Yes it is true. In winter cool, fresh, external air and warm, internal air are mixed within the unit at ceiling level avoiding cold draughts. The mixed air that reaches occupants is well mixed...

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Is mechanical cooling required?

Sometimes cooling is necessary if there are exceptionally high external temperatures or stringent requirements. A strategy should be followed that maximises the use of natural forces and...

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Is natural ventilation effective on days with no wind?

Yes with the e-stack system it is. Natural ventilation can be driven in two ways; one is by wind, the second is through buoyancy (the stack effect). As air heats up it becomes less dense so...

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Is natural ventilation just opening windows?

Opening windows can provide occupants with ventilation. However, ventilation is not just about giving people fresh air - it is also about providing comfort for occupants. Comfort for occupants...

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Isn't it just a fan in an expensive box?

The e-stack ventilation units contain relatively simple components, which also makes them robust. But there are more components than just the ones you can see, each unit incorporates temperature...

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Radiators or underfloor heating which is better for natural ventilation?

Underfloor heating systems normally consume less energy overall than radiators, and the relatively low temperatures required makes them ideal for utilising ground source heat pumps, which are...

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What is natural ventilation?

Natural ventilation is a low energy way to provide a flow of fresh air through a building using the natural forces of wind and/or buoyancy. Modern buildings tend to be well insulated to retain...

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What is the difference between the e-stack system in winter mixing mode and a heat recovery system?

A heat recovery system forces incoming fresh air and outflowing stale air to be passed through a heat exchanger. The fan power used in driving the air through these devices is higher than in...

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What is the point of annulus?

The annulus is a circular divider to separate the inflow and outflow air paths from the e-stack to the mid-height horizontal plate located within the penthouse louvre. These are only found...

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What types of buildings does natural ventilation work in?

Natural ventilation can work in any building. However we are pragmatists and in some building types it is not the most efficient form of ventilation. Natural ventilation can work in any...

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Why shouldnt you just use manually opening windows- isnt it going to be cheaper?

Manually opening windows is certainly cheaper than any form of controlled ventilation. We believe however that it is not effective at ventilating a space throughout the year. Manually opening...

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Your system involves stacks: does this mean losing floor area in a multi storey building?

In many non-residential multi storey buildings a central atrium is often available between the floor levels. This means that is possible to use e-stack natural ventilation systems without...

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