4.6 Ventilation

Communal ventilation system - KBCN1388

A communal ventilation system is acceptable as long as it meets the requirements in the HQM manual. In terms of maintenance, if it is not possible for the home occupants to carry out system maintenance themselves due to the type of system installed we would need a statement from the professional designing the system stating this. Instead, any specified ventilation system requiring maintenance must be designed to allow building services engineers to easily complete the work in a safe manner in accordance with manufacturer’s instructions and any other safety regulations, to prevent systems becoming redundant or being unable to function to their designed intention.

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Minimum ventilation rate above boost flow rate - KBCN1364

Where a ventilation system has the capacity to meet the minimum ventilation rate (Criteria '03 Ventilation rates') and where this is above the boost flow rate, then the boost flow rate can be deemed to have been met by default.

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Ventilation air intakes CIBSE TM21 compliance - KBCN0669

As TM21 largely contains general guidance, rather that strict rules, it is expected that the designer or services engineer would be familiar with the requirements within TM21 and be able to determine which sections are relevant for the development in question. The main areas to consider in relation to TM21 are: • Provision of filtration • Positioning inlets to minimise impacts of traffic pollution • Positioning inlets to minimise impacts of other local sources of pollution • Positioning inlets to minimise recirculation from ventilation exhausts Confirmation is required that each of these items (and anything else the designer/engineer deems relevant) has been considered in determining the location of air intakes. Suitable evidence may for example be in the form of a short report with diagrams indicating the proposed location of intakes, with respect to sources of pollution and with reference to the relevant parts of TM21.

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