Where ventilation specifications are available, strongly ventilated spaces shall be defined as such inaccordance with the table below:
| Option |
Brief Description |
| Exterior |
For an envelope separating the considered zone from the outside air orwater |
| Strongly ventilated spaces |
For an envelope separating the considered zone from a space providedwith one or more permanent openings (i.e., that cannot be closed), witha capacity for the supply of fresh air and extract of inside air,determined according to section 5.3 of NEN 1087, of at least 3x10¯³m³/s per m² useable Area |
| Unheated adjoining space |
For an envelope separating the considered zone from an unheatedadjoining space, other than meant under ‘Strongly ventilated spaces’. |
| Conditioned adjoining space |
For an envelope separating the considered zone from anotherconditioned zone. |
| Underground |
For an envelope separating the considered zone from the ground |
| Same space |
For constructions representing the internal envelopes that separatecontiguous zones which have been merged into one zone, i.e., theenvelope is “contained” within the merged zone. |
iSBEM User Guide (February 2012): Table 9: Options for ‘Connects space to’ field for envelopesNote that a strongly ventilated space is an alternative to an unheated adjoining space only and is notselected in any other circumstances. Where appropriate ventilation specifications are unavailable, a zone willbe considered to be a strongly ventilated space if it is unheated and is one of the following:-
1. Any part of the building being assessed that is identified with the activity of ‘car park’
2. Any non-heated/cooled industrial process area that has mechanical extraction/ventilation serving thewhole of the zone in order to accommodate the on-going processes.
3. Any area that has deliberate fixed openings in order to provide significant natural ventilation, e.g.:a. A plant room with louvered doors / vents for provision of combustion airb. A naturally ventilated internal, underground or basement store area with fixed openings
Note that windows that are left permanently open are not categorised as fixed openings. If in any doubt, theassessor is to assume the presence of a strongly ventilated space as a worst case default position. Sitenotes/evidence to be provided accordingly.
Mike Gordon
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