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About Through Wall Ventilation

If only general background ventilation is required, then product selection is less critical. A habitable room requires a free airflow of 8000mm² in order to comply with building regulations.

This can be provided by using two Timloc airbricks, complete with cavity sleeves and internal louvred hit and miss grilles. Or, alternatively, any one of the Timloc anti-draught ventilator sets can be used.

Heat producing appliance ventilation

If the room contains a heat-producing appliance, the provision of constant and reliable ventilation is critically important. The anti-draught ventilator products are strongly recommended for this application, as they comply fully with legislation governing gas and heating appliances.

The Timloc anti-draught through wall ventilators range meet the requirements and standards set by Building Regulations, British Standards, The Scottish Building Standards Technical Handbook, British Gas and the NHBC.

The size and number of anti-draught ventilator products required will be dictated by the requirements of the particular heating appliance. It is strongly recommended that advice is sought from the manufacturer.

External airbrick cowls are also available to provide protection from incoming cold draughts for existing through-wall ventilation that doesn’t negatively impact on the essential ventilation airflow requirements to keep buildings healthy. 

Product selection

Timloc recommends that customers take advantage of the technical advisory service.

The Timloc Technical Services Team will be pleased to advise on the most suitable products for the application and will prepare a fully-itemised schedule of quantities if required.

General recommendations for the specification and use of through-wall ventilators:

• always check that the appropriate size and number of through-wall ventilators are used to suit the application

• never fit just an airbrick - a cavity sleeve must always be fitted to the back of the airbrick to ensure that the air is transmitted effectively through the wall and into the room

• hit and miss grilles may only be used for general background ventilation - they must never be used to ventilate any kind of gas or heating appliance

• ventilators used to provide air for gas or heating appliances must be permanently open (there must be no facility to block or close the ventilator - they must also not contain any kind of fine mesh or insect screen)

• through-wall ventilators should always be fitted well above external ground level so as to ensure that rain and snow cannot enter the ventilator

• it is recommended that a section of horizontal cavity tray is installed directly above the through-wall ventilator to prevent water from tracking across the cavity sleeve from the outer leaf to the inside of the building

• in order to help reduce the effect of draughts, it is worth considering positioning the through-wall ventilator close to a heating appliance, rather than at the opposite side of the room

• positioning the ventilator at high level rather than close to the floor will also be of assistance.

Examples of general background ventilation:

• cavity sleeves installed with airbrick and internal hit and miss grilles

• Aero core anti-draught ventilators – for circular through-wall holes formed using a circular hole saw

• Aero wall anti-draught ventilators – for rectangular through-wall holes that are either built into wall or bricks are removed

• Acoustic Aero core anti-draught ventilators – for circular through-wall holes formed using a circular hole saw

• Acoustic Aero wall anti-draught ventilators – for rectangular through-wall holes that are either built into wall or bricks are removed

 

Examples of heat-producing appliance ventilators:

• Aero core anti-draught ventilators – for circular through-wall holes formed using a circular hole saw

• Aero wall anti-draught ventilators – for rectangular through-wall holes that are either built into the wall or bricks are removed

• Acoustic Aero core anti-draught ventilators – for circular through wall holes formed using a circular hole saw

• Acoustic Aero wall anti-draught ventilators – for rectangular through wall holes that are either built into the wall or bricks are removed.

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