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NI-wide·Technical Booklet K Ventilation

The Workplace (Health, Safety and Welfare) Regulations (Northern Ireland) 1993 (the Workplace Regulations) contain some requirements which affect building design. The main requirements are now covered

NI-wide·Technical Booklet K Ventilation

Regulation 65 shall not apply to a building or a space within a building which is used solely for storage or which is otherwise not intended for use by people. Regulations 65 and 66 shall not apply to

NI-wide·Technical Booklet K Ventilation

Regulation 67(a) shall apply only to a dwelling being newly erected or created.

NI-wide·Technical Booklet K Ventilation

Adequate means of ventilation shall be provided for people in a building. Fixed mechanical ventilation systems and any associated controls shall be tested and commissioned to ensure that the requireme

NI-wide·Technical Booklet K Ventilation

Where this regulation applies, the person carrying out the work, for the purpose of ensuring compliance with regulation 65(2), shall give, not more than 5 days after completion of the testing and comm

NI-wide·Technical Booklet K Ventilation

The guidance in Section 2 relates to the ventilation of new and existing dwellings. The Section is split into two parts, the first dealing with new dwellings with 3 ventilation methods suggested which

NI-wide·Technical Booklet K Ventilation

For the purposes of this Technical Booklet the following definitions apply – Air permeability – the air leakage rate in cubic metres per hour per square metre of envelope area (m3/(h.m2)) at a pressu

NI-wide·Technical Booklet K Ventilation

District council – is defined in regulation 2 in Part A of the Building Regulations. Domestic building – means a building or part of a building used for residential purposes such as a house, flat, ma

NI-wide·Technical Booklet K Ventilation

Gross internal volume – the total internal volume of the heated space, including the volume of all furniture, internal walls, internal floors, etc. Habitable room – is a room used for dwelling purpos

NI-wide·Technical Booklet K Ventilation

Utility room – a room used primarily for laundry purposes which may contain a sink, washing machine, tumble drier or similar moisture producing equipment and which is not entered solely from outside t

NI-wide·Technical Booklet K Ventilation

Wet room – a room used for domestic activities (e.g. such as cooking, clothes washing and bathing) which give rise to significant production of airborne moisture (e.g. a kitchen, utility room or bathr

NI-wide·Technical Booklet K Ventilation

Whole building ventilation (general ventilation) – nominally continuous ventilation of rooms or spaces at a relatively low rate to dilute and remove pollutants and water vapour not removed by the oper

NI-wide·Technical Booklet K Ventilation

Exposure to house dust mite (HDM) allergens can lead to allergic sensitization and to exacerbation of allergic conditions. The moisture criteria needed to avoid HDM are more complex and demanding than

NI-wide·Technical Booklet K Ventilation

The ventilation provisions recommended for new dwellings in this Technical Booklet have been specified according to two standard designs of air permeability – (a) in the default option, the guidance a

NI-wide·Technical Booklet K Ventilation

Where a building contains both living accommodation and space to be used for commercial purposes (e.g. a workshop or office), the whole building should be treated as a dwelling as long as the commerci

NI-wide·Technical Booklet K Ventilation

When constructing a dwelling as part of a larger building that contains other types of accommodation, Section 2 of this Technical Booklet should be used for guidance in relation to each individual dwe

NI-wide·Technical Booklet K Ventilation

This Technical Booklet adopts the following strategy (systems that comply with the strategy are described in Sections 2 and 3) – (a) using either intermittent or continuous extract ventilation from ro

NI-wide·Technical Booklet K Ventilation

This ventilation strategy can be delivered by a natural ventilation system or a mechanical ventilation system or a combination of both (i.e. "a mixed mode" or "hybrid" ventilation system). For mainly

NI-wide·Technical Booklet K Ventilation

Simple guidance in the form of ventilator sizes for the whole dwelling is also provided to make it easier for designers to meet building regulation requirements in common situations.

NI-wide·Technical Booklet K Ventilation

Other types of automatic control may be suitable for regulating ventilation devices (e.g. ventilation fans, dampers and air terminal devices) in dwellings. In such cases, it is important that the devi

NI-wide·Technical Booklet K Ventilation

Demand-controlled ventilation systems use sensors to detect the level of occupancy, water vapour or other pollutants and adjust the ventilation rate to avoid over-ventilation. In dwellings, humidity-c

NI-wide·Technical Booklet K Ventilation

The Domestic Ventilation Compliance Guide provides guidance on installing ventilation systems in new and existing dwellings. It also has a typical example of an installation checklist for the installe

NI-wide·Technical Booklet K Ventilation

Where practicable and possible, all mechanical ventilation systems are to be commissioned and the dwelling air flow rates tested and results recorded. With some systems adjustment is not possible beca

NI-wide·Technical Booklet K Ventilation

For dwellings, Sections 2 and 3 of the Domestic Ventilation Compliance Guide contain the procedures for measuring air flow rates and for the commissioning of mechanical systems. The guide also include

NI-wide·Technical Booklet K Ventilation

For dwellings, the Domestic Ventilation Compliance Guide lists the documents which should be given to the building owner and includes samples of the inspection checklist and an air flow measurement te

NI-wide·Technical Booklet K Ventilation

This Section gives three methods of ventilating dwellings, by – Method 1 – providing the ventilation rates set out in paragraphs 2.5 to 2.7; or Method 2 – following the system guidance set out – (i) f

NI-wide·Technical Booklet K Ventilation

There should be reasonable access provision for maintenance. This should include access for the purpose of changing filters, replacing defective components and cleaning duct work.

NI-wide·Technical Booklet K Ventilation

Extract fans and ventilation systems lower the pressure in a building, which can cause the spillage of combustion products from open-flued appliances. This can occur even if the appliance and the fan

NI-wide·Technical Booklet K Ventilation

The performance will be achieved by providing the air flow rates set out in paragraphs 2.5 to 2.7. The air flow rates specified are for the performance of the complete installation. The performance of

NI-wide·Technical Booklet K Ventilation

Extract ventilation to outside is required in each kitchen, utility room, bathroom and sanitary accommodation. The extract can be either intermittent or continuously operating. The intermittent rate a

NI-wide·Technical Booklet K Ventilation

The whole dwelling ventilation rate for the supply of air to the habitable rooms in a dwelling should be not less than that specified in Table 2.2.

NI-wide·Technical Booklet K Ventilation

Rapid ventilation provision is required in each habitable room and should be capable of extracting a minimum of four air changes per hour (ach) per room directly to outside. In normal circumstances, o

NI-wide·Technical Booklet K Ventilation

In other rooms (e.g. kitchens and bathrooms) the mechanical or passive stack extract provisions should provide adequate ventilation, although passive stack ventilation will take longer to purge the ro

NI-wide·Technical Booklet K Ventilation

Number of bedrooms in dwelling: 1, 2, 3, 4, 5. Whole dwelling ventilation rate (l/s): 13, 17, 21, 25, 29. Notes: (1) In addition, the minimum ventilation rate should not be less than 0.3 l/s per m² of

NI-wide·Technical Booklet K Ventilation

Room: Kitchen, Utility room, Bathroom, Sanitary accommodation. Intermittent extract – Minimum rate: Kitchen 30 l/s adjacent to hob or 60 l/s elsewhere; Utility room 30 l/s; Bathroom 15 l/s; Sanitary a

NI-wide·Technical Booklet K Ventilation

The performance required for dwellings without basements could be achieved by following one of the four systems listed in paragraph 2.11. Worked examples for each system are given in Appendix C.

NI-wide·Technical Booklet K Ventilation

For each system, guidance is given for dwellings to cover all design air permeabilities. Therefore, for ventilation purposes, it is not necessary for the as-built permeability to be close to the desig

NI-wide·Technical Booklet K Ventilation

In addition to this guidance, for each system, alternative guidance is provided for dwellings with as-built air permeabilities greater than 3 m3/(h.m2) at 50 Pa. It is recommended that this option is

NI-wide·Technical Booklet K Ventilation

System 1 – Background ventilators and intermittent extract fans. Guidance on minimum provisions for extract and whole dwelling ventilation is set out in paragraphs 2.12 to 2.40. Note that it includes

NI-wide·Technical Booklet K Ventilation

System 2 – Passive stack ventilation (PSV). Guidance on minimum provisions for extract and whole dwelling ventilation is set out in paragraphs 2.41 to 2.64.

NI-wide·Technical Booklet K Ventilation

System 3 – Continuous mechanical extract (MEV). Guidance on minimum provisions for extract and whole dwelling ventilation is set out in paragraphs 2.65 to 2.84.

NI-wide·Technical Booklet K Ventilation

System 4 – Continuous mechanical supply and extract with heat recovery (MVHR). Guidance on minimum provisions for extract and whole dwelling ventilation is set out in paragraphs 2.85 to 2.104.

NI-wide·Technical Booklet K Ventilation

System 1: background ventilators and intermittent extract fans System 2: passive stack ventilation System 3: continuous mechanical extract System 4: continuous mechanical supply and extract with heat

NI-wide·Technical Booklet K Ventilation

The background ventilators have been sized for the winter period. Additional ventilation may be required during warmer months and it has been assumed that the provisions for rapid ventilation (e.g. op

NI-wide·Technical Booklet K Ventilation

Intermittent extract rates are given in Table 2.1. For sanitary accommodation only, as an alternative, the rapid ventilation provisions (i.e. Windows) given in Appendix B can be used.

NI-wide·Technical Booklet K Ventilation

Instead of a conventional intermittently used extract fan, a continuously running single room heat recovery ventilator could be used in wet rooms. It should use the minimum high rate given in Table 2.

NI-wide·Technical Booklet K Ventilation

Intermittent extract fans should be installed in each wet room.

NI-wide·Technical Booklet K Ventilation

Intermittent extract fans other than cooker hoods should be installed as high as is practicable and preferably within 400 mm of the ceiling.

NI-wide·Technical Booklet K Ventilation

Cooker hoods should be 650 mm to 750 mm above the hob surface (or installed in accordance with the manufacturer's instructions).

NI-wide·Technical Booklet K Ventilation

Where fans and background ventilators are provided in the same room they should be a minimum of 500 mm apart.