kSIST FprEN 14972-7:2023
(Main)Fixed firefighting systems - Water mist systems - Part 7: Test protocol for commercial low hazard occupancies for automatic nozzle systems
Fixed firefighting systems - Water mist systems - Part 7: Test protocol for commercial low hazard occupancies for automatic nozzle systems
This document specifies fire testing requirements for water mist systems used for fire protection of commercial low hazard occupancies up to 5 m ceiling height.
EXAMPLE Examples for commercial low hazard occupancies are apartments, churches, concealed spaces, gymnasiums, hospitals, hotels, libraries, museums, offices, restaurant seating areas, schools and university class rooms, unused attics.
Ortsfeste Brandbekämpfungsanlagen - Wassernebelsysteme - Teil 7: Prüfprotokoll für kommerzielle Belegung geringer Gefährdung für automatische Düsensysteme
Dieses Dokument legt die Anforderungen an Brandversuche für Wassernebelsysteme fest, die für den Brandschutz von kommerziellen Belegungen geringer Gefährdung bis zu einer Deckenhöhe von 5 m verwendet werden.
BEISPIEL Beispiele für kommerzielle Belegungen geringer Gefährdung sind Wohnungen, Kirchen, verdeckte Räume, Sporthallen, Krankenhäuser, Hotels, Bibliotheken, Museen, Büros, Sitzbereiche in Restaurants, Unterrichtsräume in Schulen und Universitäten sowie ungenutzte Dachböden.
Installations fixes de lutte contre l'incendie - Systèmes à brouillard d'eau - Partie 7 : Protocole d'essai des systèmes à buses automatiques pour locaux commerciaux à risque faible
Le présent document spécifie les exigences en matière d'essais au feu pour les systèmes à brouillard d'eau utilisés pour la protection contre l'incendie des locaux commerciaux à risque faible d'une hauteur sous plafond allant jusqu'à 5 m.
EXEMPLE Les appartements, églises, espaces cachés, gymnases, hôpitaux, chambres d'hôtel, bibliothèques, musées, bureaux, salles de restaurant, salles de classe scolaires et universitaires et greniers inutilisés sont des exemples de locaux commerciaux à risque faible.
Vgrajeni gasilni sistemi - Sistemi s pršečo vodo - 7. del: Protokol preskušanja sistemov s samodejnimi šobami za komercialne prostore z nizko stopnjo nevarnosti
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 14972-7:2022
01-julij-2022
Vgrajeni gasilni sistemi - Sistemi s pršečo vodo - 7. del: Protokol preskušanja
sistemov s samodejnimi šobami za komercialne prostore z nizko stopnjo
nevarnosti
Fixed firefighting systems - Water mist systems - Part 7: Test protocol for commercial low
hazard occupancies for automatic nozzle systems
Ortsfeste Brandbekämpfungsanlagen - Wassernebelsysteme - Teil 7: Prüfprotokoll für
kommerzielle Belegung geringer Gefährdung für automatische Düsensysteme
Installations fixes de lutte contre l'incendie - Systèmes à brouillard d'eau - Partie 7 :
Protocole d'essai des systèmes à buses automatiques pour locaux commerciaux à
risque faible
Ta slovenski standard je istoveten z: prEN 14972-7
ICS:
13.220.10 Gašenje požara Fire-fighting
oSIST prEN 14972-7:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 14972-7:2022
DRAFT
EUROPEAN STANDARD
prEN 14972-7
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2022
ICS 13.220.20
English Version
Fixed firefighting systems - Water mist systems - Part 7:
Test protocol for commercial low hazard occupancies for
automatic nozzle systems
Installations fixes de lutte contre l'incendie - Systèmes Ortsfeste Brandbekämpfungsanlagen -
à brouillard d'eau - Partie 7 : Protocole d'essai des Wassernebelsysteme - Teil 7: Prüfprotokoll für
systèmes à buses automatiques pour locaux kommerzielle Belegung geringer Gefährdung für
commerciaux à risque faible automatische Düsensysteme
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 191.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14972-7:2022 E
worldwide for CEN national Members.
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Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 General requirements . 4
4.1 General. 4
4.2 Categories . 5
5 Fuel packages . 5
5.1 Fuel package 1 (bunk beds) . 5
5.2 Fuel package 2 (corner crib and simulated furniture) . 7
5.3 Fuel packages 3 (sofas) . 9
5.4 Fuel package 4 (simulated work station). 11
6 Test arrangement . 14
6.1 Test room A (small compartment) . 14
6.2 Test room B (large compartment) . 15
6.3 Test room C (open space) . 19
6.4 Test room D: open space . 19
7 Test equipment requirements . 19
8 Test conditions . 20
9 Fire tests . 21
9.1 Procedure . 21
9.2 Small compartment with bunk beds . 23
9.3 Large compartment with corner crib and simulated furniture . 23
9.4 Open space with sofas under one nozzle . 23
9.5 Open space with sofas between two nozzles . 23
9.6 Open space with sofas between four nozzles . 24
9.7 Open space with simulated work station under one nozzle . 24
9.8 Open space with simulated work station between two nozzles . 24
9.9 Open space with simulated work station between four nozzles . 24
10 Pass/fail criteria . 25
11 Test report . 26
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European foreword
This document (prEN 14972-7:2022) has been prepared by Technical Committee CEN/TC 191 “Fixed
firefighting systems”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
EN 14972, Fixed firefighting systems — Water mist systems, consists of the following parts:
— Part 1: Design, installation, inspection and maintenance
— Part 2: Test protocol for shopping areas for automatic nozzle systems
— Part 3: Test protocol for office, school class rooms and hotel for automatic nozzle systems
— Part 4: Test protocol for non-storage occupancies for automatic nozzle systems
— Part 5: Test protocol for car garages for automatic nozzle systems
— Part 6: Test protocol for false floors and false ceilings for automatic nozzle systems
— Part 7: Test protocol for commercial low hazard occupancies for automatic nozzle systems
3
— Part 8: Test protocol for machinery in enclosures exceeding 260 m for open nozzle systems
3
— Part 9: Test protocol for machinery in enclosures not exceeding 260 m for open nozzle systems
— Part 10: Test protocol for atrium protection with sidewall nozzles for open nozzle systems
— Part 11: Test protocol for cable tunnels for open nozzle systems
— Part 12: Test protocol for commercial deep fat cooking fryers for open nozzle systems
— Part 13: Test protocol for wet benches and other similar processing equipment for open nozzle systems
3
— Part 14: Test protocol for combustion turbines in enclosures exceeding 260 m for open nozzle systems
3
for open nozzle
— Part 15: Test protocol for combustion turbines in enclosures not exceeding 260 m
systems
— Part 16: Test protocol for industrial oil cookers for open nozzle systems
— Part 17: Test protocol for residential occupancies for automatic nozzle systems
NOTE This list includes standards that are in preparation and other standards might be added.
For current status of published standards refer to www.cencenelec.eu.
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1 Scope
This document specifies fire testing requirements for water mist systems used for fire protection of
commercial low hazard occupancies up to 5 m ceiling height.
EXAMPLE Examples for commercial low hazard occupancies are apartments, churches, concealed spaces,
gymnasiums, hospitals, hotels, libraries, museums, offices, restaurant seating areas, schools and university class
rooms, unused attics.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 520, Gypsum plasterboards — Definitions, requirements and test methods
EN 636, Plywood — Specifications
EN 12259-1, Fixed firefighting systems — Components for sprinkler and water spray systems — Part 1:
Sprinklers
EN 14972-1:2020, Fixed firefighting systems — Water mist systems — Part 1: Design, installation,
inspection and maintenance
EN 13501-1:2018, Fire classification of construction products and building elements — Part 1:
Classification using data from reaction to fire tests
ISO 5660-1:2015, Reaction-to-fire tests — Heat release, smoke production and mass loss rate — Part 1:
Heat release rate (cone calorimeter method) and smoke production rate (dynamic measurement)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 14972-1:2020 and the following
apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
low hazard occupancy
non-storage, non-manufacturing occupancy where the quantity and combustibility of the content is low
with maximum fuel loads
Note 1 to entry: Fuel loads are specified in 5.1 to 5.4.
4 General requirements
4.1 General
The low hazard occupancy tests comprise small, large and open compartments, plus open plan office
simulations. The water mist system needs to pass all the tests for the categories for which it is to be used.
Up to a maximum of 5 nozzles used in the fire tests shall be kept for later verification.
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4.2 Categories
4.2.1 Category I system
2 2
This system covers rooms up to 37 m containing low hazard fire loads ≤ 150 MJ/m up to 2,4 m ceiling
height.
4.2.2 Category II system
2
This system covers unlimited rooms containing low hazard fire loads, ≤ 150 MJ/m up to 5 m ceiling
height.
4.2.3 Category III system
2
This system covers unlimited rooms containing low hazard fire loads, ≤ 500 MJ/m up to 5 m ceiling
height.
5 Fuel packages
5.1 Fuel package 1 (bunk beds)
The bunk bed shall consist of two units designated as the upper and lower bunks.
Each bunk shall consist of three components: a steel frame, a mattress, and a pillow.
The steel frame for the bunk beds shall be constructed of rectangular steel, 2 mm thick, steel.
The primary supporting structure shall be constructed to support the two mattress frames and bunk beds
(see Figure 1).
The top and bottom mattress frames shall be constructed of similar steel stock, with dimensions of
2,0 m × 0,8 m. 3 mm sheet steel, with dimensions of 2,0 m × 0,8 m, shall be welded to the top and bottom
mattress frames. These two assemblies shall be attached to the primary bunk bed support structure in
an appropriate manner that allow the mattresses to be placed flat and square, and without deformation.
NOTE Additional brackets can be provided on the primary frame to provide support for the vertical mattress.
5
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Dimensions in metres
Key
1 embedded ceiling surface thermocouple 3 ignition point
2 gas temperature thermocouple (75 mm below ceiling surface)
Figure 1 — Fuel package 1 (bunk bed)
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The bottom mattress frame assembly shall be located such that the top of the frame is 300 mm above the
floor. The top mattress frame assembly shall be located 1 m above the bottom mattress frame assembly.
Each mattress shall consist of a 2 m × 0,8 m × 0,1 m piece of polyether foam with a cotton fabric cover.
Each pillow shall consist of a 0,5 m × 0,8 m × 0,1 m piece of polyether foam with a cotton fabric cover cut
from the end of a mattress. The cotton fabric covers shall not be fire-retardant-treated and shall have an
2 2
area weight of 140 g/m to 180 g/m .
2
The covers shall be one-ply and shall contain a thread count of approximately 0,186 threads per mm .
The cut end of the pillow shall be positioned such that it faces the doorway of the test room.
The lower bunk shall have an additional mattress with a cotton fabric cover positioned as a back rest (see
Figure 1). Two bunk beds shall be used, one on each side of the test room.
The mattress and pillow material shall be made of non-fire-retardant polyether foam and shall have a
3
density of approximately 33 kg/m .
2
When tested in accordance with ISO 5660-1:2015 at 35 kW/m in the horizontal position, the mean
values shall be as specified in Table 1.
Table 1 — Burning characteristics of foam mattress material
Requirement
Property
Time to ignition 2 s to 6 s
2
3 min average heat release rate (270 ± 50) kW/m
Minimum heat of combustion (28 ± 3) MJ/kg
2
Total heat release (50 ± 12) Ml/m
5.2 Fuel package 2 (corner crib and simulated furniture)
The large compartment corner fuel package shall consist of a wood crib and simulated furniture (see
Figure 2).
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Dimensions in metres
a) Simulated furnace (front) b) Simulated furnace (side)
c) Wood crib
Key
1 foam, 864 mm wide 6 foam, 76 mm thick
2 plywood, 787 mm high 7 metal angle frame, 3 mm thick
3 plywood, 890 mm wide 8 timber, 38 mm × 38 mm nominal size
4 plywood backing, 13 mm thick 9 steel pan, 605 mm × 305 mm × 104 mm
5 foam, 762 mm high
Figure 2 — Fuel package 2 (corner crib and simulated furniture)
The wood crib shall be 300 mm × 300 mm × 150 mm high and shall consist of four layers of lumber. Each
layer shall consist of four 300 mm long pieces of 38 mm × 38 mm kiln-dried spruce or fir lumber. The
lumber in each layer shall be placed at right angles to the adjacent layers.
Individual wood members in each layer shall be evenly spaced along the 300 mm length and stapled to
adjacent layers. The mass of the crib shall be 2,5 kg to 3,2 kg.
After assembly, the wood crib shall be conditioned at a temperature of (20 ± 5) °C for 24 h to 72 h.
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After conditioning, the wood crib shall be placed on top of a nominal 300 mm × 300 mm × 100 mm high,
2,5 mm thick steel pan (see Figure 2), which shall contain 0,47 L water and 0,24 L heptane and shall be
located on the floor in a corner of the test enclosure. The wood crib shall be centred on the pan and
positioned 55 mm from each wall (see Figure 6 and Figure 7).
The simulated furniture shall consist of foam cushions attached to a plywood backing and supported by
a steel frame. The cushions shall consist of two pieces of uncovered pure polypropylene oxide polyol,
polyether foam having a density of (30 ± 5) kg/m3 and measuring 860 mm × 760 mm × 76 mm. When
2
tested in accordance with ISO 5660-1 at 35 kW/m in the horizontal position, the mean values shall be as
specified in Table 1.
Each foam cushion shall be fixed to a 890 mm × 790 mm, nominal 12 mm thick, plywood backing using
an aerosol urethane foam adhesive.
The location of the foam on the plywood shall give a 13 mm gap between the sides of the cushion and the
sides of the backing, and a 25 mm gap between the bottom of the cushion and the bottom of the backing,
as shown in Figure 2.
The foam cushion and plywood backing assembly shall be conditioned at (21,1 ± 2,8) °C and (50 ± 10) %
relative humidity for at least 24 h prior to testing, and shall then be placed in a steel support frame that
holds the assembly in the vertical position.
The simulated furniture, wood crib, and steel pan shall be placed as illustrated in Figure 6 and Figure 7
on a piece of cement board sheathing or equivalent non-combustible sheathing material measuring
1,2 m × 1,2 m × 6 mm.
Two 150 mm × 50 mm × 30 mm bricks shall be placed on the cement board sheathing against the foam
cushions, with their ends flush with the edge of the foam. Two cotton wicks, 150 mm long with a 6 mm
diameter, shall be soaked in heptane and placed on bricks, with their ends flush with the edge of the bricks
and foam (see Figure 6 and Figure 7).
5.3 Fuel packages 3 (sofas)
There shall be four sofas, each consisting of three components: two mattresses and a steel frame. Each
mattress shall consist of a 2 m × 0,8 m × 0,1 m piece of polyether foam with a cotton fabric cover.
The test configuration shall be as shown in Figure 3.
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Dimensions in metres
Key
1 sofa number 1 5 ignition point
2 sofa number 2 6 ceiling surface and gas temperature thermocouples
3 sofa number 3 7 sofa material 2,0 m × 0,8 m × 0,1 m
4 sofa number 4
Figure 3 — Fuel package 3 (sofas)
The steel frames shall consist of rectangular bottom and backrest frames constructed of steel angles,
channels, or rectangular stock of at least 3 mm thickness. The frame dimensions shall be 2,0 m × 0,65 m.
The seat and backrest cushions shall be supported on each frame by three steel bars, 20 mm to 30 mm
wide × 0,65 m long, spaced every 0,5 m and welded to the frames. Steel plates shall not be used to support
the cushions. The assembled frames shall be supported by four legs constructed of similar steel stock.
The two rear legs shall be 500 mm in height and the front legs should be 580 mm in height.
Each sofa shall have a rectangular armrest on each end. The armrest shall be constructed of similar steel
stock and shall be 0,2 m in height and 0,5 m in length. The rear section of the armrest shall be attached to
the bottom frame 50 mm from the backrest.
Each mattress shall consist of a 2 m × 0,8 m × 0,1 m piece of polyether foam with a cotton fabric cover.
2
The cotton fabric covers shall not be fire-retardant-treated and shall have an area weight of 140 g/m to
2
180 g/m . The covers shall be one ply and shall contain a thread count of approximately 0,186 threads
2
per mm .
The mattress and pillow material shall be made of non-fire-retardant polyether foam and shall have a
3
density of approximately 33 kg/m .
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2
When tested in accordance with ISO 5660-1 at 35 kW/m in the horizontal position, the mean values shall
be as specified in Table 1.
The mattresses shall be positioned in each sofa frame such that the vertical mattress rests on top of the
horizontal mattress. After being soaked in heptane (see 9.1.3), the igniter (7.11) shall be wrapped in a
plastic bag and positioned as shown in Figure 3.
5.4 Fuel package 4 (simulated work station)
The simulated work station fuel load arrangement shall be as shown in Figure 4.
Two walls shall be constructed 2,4 m wide × 1,8 m high from two layers of plasterboard attached to a
timber frame. The walls shall be positioned to form a corner arrangement. The front face of the walls shall
be clad with 12 mm thick Elliotis pine plywood panels in accordance to EN 636.
The table arrangement shall be formed from two differently sized tables, each constructed from 22 mm
thick chipboard with a metal angle support frame. The large table shall measure 2,4 m long × 1,2 m
wide × 760 mm high, and the small table 1,2 m long × 0,9 m wide × 760 mm high. The two tables shall be
butted together, and aluminium foil tape shall be used to seal the joint. The chipboard tables shall be
separated from the plywood walls by a gap of (10 ± 2) mm (see Figure 4).
Two separate wood and plastic cribs (a corner crib and a target crib) shall be located underneath the
table arrangement. Each crib shall be formed from 40 sticks of pinus silvestris (European redwood)
measuring 38 mm × 38 mm × 250 mm long, and 16 sticks of pinus silvestris measuring
38 mm × 38 mm × 1 000 mm, arranged in alternate layers. Four layers of ten of the short sticks shall be
equally spaced over the length of the crib with the bottom layer forming the bottom of the crib. Four
layers of four of the long sticks shall be equally spaced over the width of the crib, with the top layer
forming the top of the wood crib. Additionally, 27 sticks of natural polypropylene shall be inserted in the
gaps formed by the wood crib sticks on the top two layers of the crib and on top of the crib itself (that is
three rows of nine sticks). The polypropylene sticks shall measure 35 mm × 200 mm × 10 mm thick.
The corner crib shall be positioned 400 mm away from the plywood wall, with the length of the crib
positioned parallel to the wall. The end of the crib (closest to the corner) shall be 250 mm away from the
other plywood wall.
The target crib shall be positioned 250 mm away from the plywood wall, with the length of the crib
positioned parallel to the wall. The end of the crib (closest to the corner crib) shall be 500 mm away from
the corner crib.
The target table fuel loading shall consist of cardboard box files, polyurethane foam and paper, as follows:
— ten cardboard box files measuring 370 mm × 265 mm × 75 mm wide;
3 3
— six sheets of polyurethane foam having a density of 17 kg/m to 19 kg/m and measuring
370 mm × 265 mm × 75 mm wide;
2
— four batches of 500 sheets of white size A4 paper having a density of approximately 80 g/m .
Two sets of box files and foam sheets shall be used, each of three box files spaced with three foam sheets.
For each arrangement, the two box files closest to the corner shall each be filled with 500 sheets of white
size A4 paper. The box files and foam sheets shall be positioned 50 mm away from the adjacent plywood
walls.
For the box files above the corner crib, the face of the box file closest to the corner shall be 250 mm away
from the plywood wall.
For the box files above the target crib, the face of the box file closest to the corner shall be 500 mm away
from the plywood wall.
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Additionally, two target box files shall be positioned 500 mm away from the face of the end foam sheet
and shall also be positioned 50 mm away from the plywood walls.
After being soaked in white spirit (see 9.1.3), igniters shall be positioned in the corner crib (at the end
close to the wall) at the base of the crib as shown in Figure 4 d).
Dimensions in metres
a) Plan view showing the position of the walls, tables and cribs on the floor
b) Plan view showing the position of the walls, tables and table fire load on the tables
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c) Plan view showing the position of the cribs in relation to the walls
Plan Side Front elevation
elevation
d) Crib arrangement
Key
1 corner crib ignition location (corner crib)
2 ignition location foam sheet
3 small table box file (empty)
4 large table box file (full)
5 target crib wood sticks
6 wall polypropelen sticks
Figure 4 — Fuel package 4 (simulated work station)
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6 Test arrangement
6.1 Test room A (small compartment)
The small compartment shall measure 3 m × 4 m and shall be 2,4 m in height. A 1,2 m × 1,2 m
compartment shall be provided within this space to simulate a lavatory. The compartment shall have a
doorway with dimensions of 0,8 m wide and 2,2 m high. This doorway shall not include a door.
The walls of the compartment shall be fabricated from a 12 mm nominal thickness non- combustible wall
board backed with 45 mm nominal thickness mineral wool insulation. The wall board shall be covered
with 3 mm to 4 mm nominal thickness Elliotis pine plywood in accordance to EN 636.
The ceiling of the test room shall be covered with acoustical panels attached to furring strips or gypsum
plasterboard in accordance to EN 520. The panels shall be installed in the 2,4 m × 2,4 m area directly over
the fire source and shall measure 0,6 m × 1,2 m. The panels shall be 12,5 mm thick, have a density of
3
(216 ± 24) kg/m . The minimum reaction to fire performance shall be Euroclass A2, s2, d0 in accordance
to EN 13501-1:2018, 8.3 to 8.5.
The thermocouples (7.14) shall be centred directly over the ignition source as shown in Figure 5. The
panelling shall be conditioned at (20 ± 5) °C and (50 ± 10) % relative humidity for at least 72 h.
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Dimensions in metres
Key
1 corridor min. length 12 m 7 half x spacing between nozzles
2 lavatory 8 ignition point
3 bunk bed 9 embedded surface thermocouple
4 corridor nozzle 10 gas temperature thermocouple 75 m below ceiling
surface
5 centre nozzle 11 corridor
6 sidewall nozzle
Figure 5 — Test room A (small compartment)
6.2 Test room B (large compartment)
For water mist systems using pendent or upright nozzles, including flush, recessed, and concealed
pendent nozzles, the large compartment shall be the minimum required room size for four nozzles at the
maximum nozzle spacing, with one half the maximum nozzle spacing to the walls, and 2,4 m in height.
The compartment shall have equal length sides, as specified by the manufacturer, and shall include a
2
minimum area of 37 m (see Figure 6).
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For water mist systems using sidewall nozzles, including flush, recessed, and concealed sidewall nozzles,
the large compartment shall be the minimum required room size for one nozzle to be installed in the
centre of each wall at the maximum nozzle spacing (four total nozzles).
The room height shall be 2,4 m. The compartment shall have equal length sides, as specified by the
manufacturer (see Figure 7).
The compartment shall have two doorways located in diagonally opposite corners of the room as shown
in Figure 6. Each doorway shall measure 0,8 m wide and 2,2 m high. These doorways shall not include
doors.
The walls of the compartment shall be fabricated from a 12 mm nominal thickness non- combustible wall
board, backed with 45 mm nominal thickness mineral wool insulation. Sheets of plywood panelling
measuring 1,2 m × 2,4 m shall cover two of the test enclosure walls at a common corner. The panelling
shall be 6 mm thick, with each ply const
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