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Ventilation is simply the removal of ‘stale’ indoor air from a building and its replacement with ‘Fresh’ outside air. It is essential for the health and comfort of the occupants of a building

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When people or animals are present in buildings, ventilation is necessary to dilute odours and limit the concentration of carbon dioxide and airborne pollutants such as dust, smoke and volatile organic compounds (VOCs). Ventilation air is often delivered to spaces by mechanical Air movement into buildings can occur due to uncontrolled infiltration of outside air through the building

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Ventilation is a process of "changing" or replacing air in any space to provide high indoor air quality.

It works by removing unpleasant odours, excessive moisture and contaminants from stale air, and introducing fresh outside air. This keeps the interior building air circulating, and prevents stagnation of the interior air.

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There are 3 main types of fan available:-

• • Axial – are suitable to move air over short distances, in a window or through-wall fixing.
• • Centrifugal – are designed to move air over longer distances and performs well against the pressure of longer duct lengths and resistance of grilles.
• • Mixed Flow – a cross between axial and centrifugal designed to produce higher working pressures for applications that require high air flows, with low relative noise.

For all your fan requirements Addvent offer a free of charge design service for your ventilation needs.

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For new build premises with intermittent mechanical ventilation, Documents L and F (2010) of the Building Regulations must have the following minimum extract rates:-

• • Toilets (where separate to a bathroom) – a minimum extract rate of 6 litres/sec.
• • Bath/Shower Rooms – a minimum extract rate of 15 litres/sec.
• • Utility Rooms - a minimum extract rate of 30 litres/sec.
• • Domestic Kitchens - a minimum extract rate of 60 litres/sec.

For new build premises with wholehouse ventilation, or wholehouse ventilation with heat recovery, Documents L and F (2010) of the Building Regulations must have the following minimum extract rates:-

• • Toilets (where separate to a bathroom) – a minimum extract rate of 6 litres/sec.
• • Bath/Shower Rooms – a minimum extract rate of 8 litres/sec.
• • Utility Rooms - a minimum extract rate of 8 litres/sec.
• • Domestic Kitchens - a minimum extract rate of 13 litres/sec.

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Intermittent ventilation is where a fan does not run all the time, usually only running when there is a particular need to remove pollutants or water vapour (e.g., cooking or bathing)

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Wholehouse mechanical ventilation systems are designed to provide continuous, simultaneous ventilation to multiple areas in modern dwellings. Ideally suited to new-build with airtight, well-insulated construction for the most effective performance, these units can be user controlled to give a manual ‘boost’ function at times of high need.

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Wholehouse ventilation with heat recovery provides the benefits of a wholehouse system with the addition of a high-efficiency heat recovery cell. This state of the art system simultaneously extracts moisture from wet areas passing it through the heat recovery cell to temper the incoming fresh air, which is then distributed around the dwelling. This provides a saving in energy as well as providing replacement air throughout the whole house.

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There are controllers which can be incorporated in the fan itself or installed as remote accessories. There are 5 main types of control available:-

• • Standard – for remote switching through a separate switch/pull cord.
• • Timer – with a built-in adjustable run on time delay which continues after the fan is manually switched off.
• • Pull Cord – with a built in pull cord switch rather than a separate switch.
• • Humidistat – Control with a built-in sensor which operates the fan automatically if the humidity rises above a set level. These still have a manual override.
• • PIR – Sensitive to movement these fans switch on and off when a room is entered or vacated.

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Addvent offer a wide range of accessories for its fan range. These include wall kits, window kits, a range of flexible, solid and insulated solid ducting ranges, connection pieces and grilles. Please refer to Accessories section for full details (put clickable link here)

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Addvent offer a wide range of speed controllers for its fans from 150mm upwards, including its commercial, industrial and inline ranges. Also available are a range of remote controllers for overrun timer, humidistat and PIR. (Put clickable link here)?

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When siting and installing extractor fans, the following should be considered;

• • Site the fan as far away as possible from the air inlet to the room.
• • The fan should be sited as close as possible to the moisture source.
• • Avoid installing close to heat sources to prolong motor life.
• • In bathrooms the fan must not be within reach of a person using the bath or shower and must conform to I.E.E. Regulations.
• • It is preferable to use a loft or ceiling void for ventilating shower rooms or bathrooms.
• • Where ducting runs through unheated areas it should be insulated to prevent condensation. Vertical duct runs should be avoided if possible.
• • Ensure adequate air leakage into the rooms to provide replacement fresh air.
• • Do not install extract fans in rooms where open flued appliances are sited.
• • Ventilation products should always be installed by a competent electrician.

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Electrical equipment may be identified as having a certain level of mechanical and moisture protection. This is called Ingress Protection and is quoted as an IP number – such as IPXY, where X and Y are numbers. X indicates the level of mechanical protection and Y the level of moisture protection. In both cases, the higher the number, the better the protection. If and item of electrical equipment is not rated it must not be used in zones 0, 1 or 2 (or elsewhere in a wet/damp environment). (put clickable link to zone diagram from Addvent catalogue P78 here)

Bathroom Zones are identified from 0 to 2 with 0 being the wettest, the former zone 3 is now undefined. (put clickable link to zone diagram from Addvent catalogue P78 here)

Zone 0 – The interior of the bath or shower which can hold water. Requires low-voltage (max 12v) electrical products and to be IPX7 (the X means does not require mechanical protection).
Zone 1 – The area directly above zone 0 is limited vertically to 2.25m above the bottom of the bath or shower. Zone 1 requires electrical products to be IPX4 or better, or SELV (Safety Extra Low Voltage) with the transformer located beyond Zone 2.
Zone 2 – The area beyond zones 0 and 1, 0.6m horizontally and up to 2.25m vertically. Zone 2 also includes any window with a sill next to the bath. Zone 2 requires electrical products to be IPX4 or better, or SELV (Safety Extra Low Voltage) with the transformer located beyond Zone 2.

Addvent offers a full range of IP24 rated fans and IP44 low voltage fans which meet these regulations.

Please refer to page 78 of the Addvent catalogue for more details. Addvent catalogue