FAQs ON OUR VENTILATION SERVICES AND INSTALLATIONS

There is often confusion about what ventilation actually means. Ventilation is the introduction of fresh outside air into a room and the removal of the indoor contaminated air to the outside. It should not be confused with air conditioning, air filtration or air cleaning. However, filtered, recirculated air can form part of the ventilation scheme.

Ventilation is required for all occupied spaces. Although air conditioning, air cleaners and filtration systems can be used in conjunction with ventilation units, they do not generally contribute to the air-change (ACH) rate per hour. Here are some basic examples:

Ventilation

• Air Handling Units, Heat Exchangers etc.
• Brings in fresh outside air and extracts stale air
• They also dilute and remove gases including carbon monoxide and other hazardous substances

Air Cleaning/Filtration

• Usually a cassette unit on the wall or ceiling
• Removes particles from the air
• They can sometimes remove some gases through a carbon filter, heppa filter etc.

Air Conditioning

• Simply heats, cools and or humidifies the air. Some systems also supply a small amount of fresh air.
• Recirculates air already in the room and does not usually provide fresh air (although in some systems 15-20% fresh air).

Yes, there are three main types. They are:

• Natural Ventilation (e.g. windows, vents in walls/roof spaces)
• Mechanical Ventilation Air, which is supplied and extracted from the space using fans
• Mixed Mode Ventilation (combination of natural and mechanical ventilation to suit a building’s needs).

Cost depends on type of ventilation, amount of ductwork (if any), and degree of difficulty of installation.

Various sizes (flow rates) are available. The right size unit depends on the number of occupants and the cubic capacity of the area to be ventilated.

Yes. The continuous flow of fresh air, and the removal of contaminated air, dilutes gases and can reduce the concentration of airborne particles in the space.

This is entirely dependent on the size and degree of the job. However, once a project is signed-off, we will endeavour to complete the job quickly and with minimal disturbance to your business.

We always strive to give every single client the best experience. From the point of enquiry to the completion of the project, we will communicate effectively with you and ensure that we sort any problems as quickly as possible without causing unnecessary delays to the project.

You can be assured of our professionalism, efficiency and honesty at all times.

Sigma recommends that your ventilation system be maintained at least once a year. Filter change etc. is dependent on contamination level and intensity of use amongst other wear and tear factors.

100% fresh filtered air is brought into the venue while the volatile organic compounds (VOCs) are removed, reducing the risk of respiratory illnesses.

Yes. Incoming air can be warmed naturally using Sigma’s patented Heat Recovery Core. Alternatively an electrical heater battery can be fitted in the unit.

Our flexible manufacturing systems allow us to custom make the unit to suit your venue. Units are easily fitted into new builds or retro-fitted in existing premises (even listed buildings).

It is recommended that we carry out a survey in order to put forward a fully costed proposal.

Sigma or a preferred installer.