CLE
A
N
A
GE
N
T
SUPP

NFPA 75 “Protection of Information Technology Equipment” states that power supply to all electronic devices should be cut off at the same time
when the gas fire suppression system starts discharging the gas agent.

EThe discharge of a gas extinguishing agent results in the emission of a high level of noise. This noise may affect modern precision instruments suchas hard disc drives (” HDD” ). This effect occurs when discharging any agents described in NFPA such as inert gases, HFCs, HCFCs, FICs, FKs, andHalon.
In a communication equipment room, computer room or server room with hard disc drives installed, we recommend you to use the lower soundgas discharge nozzle described in this document, which emits a lower level noise when discharging the gas. Please note that NOHMI does notguarantee the performance of HDD. Other countermeasures may be effective to protect HDD, such as sound insulation and vibration isolation for
HDD housing rack (i.e. use of acoustic absorption materials and vibration-proof materials, etc.), measures to protect HDD before discharging a gas
agent (i.e. stop running HDD, evacuation of magnetic heads, etc.), or improvement in sound-proofing of HDD itself and/or data protection (backupof data, etc.). Please note that, even if a customer replaces the existing normal discharge nozzles with the lower sound discharge nozzles andadopts all or part of the above countermeasures, NOHMI does not guarantee the performance of HDD.

R

This system comprises cylinders filled with highly pressurized gas. Handle the cylinders with care according to the cautions indicated on them.

I

This system is intended to suppress a fire in its early stage. Please note that it may not suppress the fire if kind, quantity and/or arrangement ofcombustibles in the area protected by this system is changed after installing the system.

FNOTE:

NOHMI BOSAI LTD. CLEAN AGENT FIRE SUPPRESSION SYSTEM NN100
Catalog Number 180820© -E-1405YO2

Clean Agent Fire Suppression System

The excessive pressure in a protected room caused by the discharge of the agent must be released to prevent the room from incurring damage.
Therefore, a pressure relief device must be installed in the room.

RProducts of combustion may be released by fire. Therefore, an exhaust fan must be installed in the protected room and it must be activated after
extinguishing the fire to remove the products of combustion.

EThe information contained herein does not purport to cover all the details or variations in the equipment described, nor provide for every possible
contingency that may be met in connection with its installation, operation or maintenance.

S

Specifications are subject to change without notice. Contact Nohmi before relying on the information.
Actual performance is based on proper application of the product by a qualified professional.

SShould further information be required or should particular concerns arise that are not covered sufficiently for the purchaser's purposes, thematter should be referred to Nohmi or your nearest distributor.

I* “NN100” is the trademark registered by NOHMI BOSAI LTD.
*The original manufacturer of the NN100 system products is Koatsu Co., Ltd., an affiliate of Nohmi Bosai Ltd.
* The contents of this brochure are valid as of August 2018.

ON

Distributed by :SY
EHead Office: 4-7-3 Kudan-Minami, Chiyoda-ku, Tokyo 102-8277, JapanT

https://www.nohmi.co.jp/english/

S

Tel: +81-3-3265-0231 Fax: +81-3-3265-5348

nature loves
a clean agent
Clean Agent Fire Suppression SystemM

FEATURES
ZERO OZONE DEPLETION POTENTIAL
ZERO GLOBAL WARMING POTENTIAL–A STANDARD FIRE SUPPRESSION SYSTEM IN THE NEW AGE

Today, global environmental protection is one of the most serious issues for survival

Zero ODP and zero GWPThe NN100 system has zero ozone depletion potential and zero global
warming potential, since it employs nitrogen gas, occupying 78% of theair, as the fire extinguishing agent.

Not toxic to humans

The NN100 system employs no carbon dioxide and no halocarbon. Thereis no possibility of producing hydrofluorine, a toxic gas, even in contact
with heat or flame.

Low refill cost

The NN100 system requires neither synthetic nor blended gas as a fire
extinguishing agent. It requires only nitrogen gas commonly available forindustrial use and refill poses no technical difficulties.

Cylinder-valve regulated
discharge pressure

The valve on the nitrogen storage cylinder is fitted with a pressureregulating mechanism. The nitrogen gas is stored at 30Mpa in thecylinder and can be discharged constantly at 10.8Mpa or less at thecylinder outlet. This functionality allows the NN100 to utilize typicalpressure rating pipes for existing systems, such as a CO2 gas fire
suppression system. This mechanism has been patented in the USA.

Clear view to exits

The discharge of nitrogen gas does not cause any problem with visibility
necessary for occupants to access exits, since no condensation in the air
takes place on discharge of the agent.

No residue after discharge

The NN100 system can be used to protect rooms containing precisioninstruments or fine arts, since there is no vaporization of the agent ondischarge, and therefore no condensation in the air.

Centralized cylinder station

The NN100 high pressure system can be designed to cover multiple zones
with a single cylinder station containing sufficient agent for the largestzone.

Flexible piping configurable

The dedicated flow calculation software program allows users toconfigure flexible piping.

Large capacity storage
cylinder available

Besides the 83L cylinder, the double-capacity 166L cylinder is available,
which can save the total system cost and the installation space.

Noise reduction nozzle
available

NN100 system has the noise reduction nozzles to reduce the gas
discharge noise lower than 100dB. See “Acoustic effect on precision
instruments” on the later page.

of the human race. Fire suppression systems are also at a new stage where they mustmeet requirements from the perspective of global environmental protection andsafety for human beings.
We, as a manufacturer of fire suppression systems, have made thorough efforts in theformation of an ideal fire suppression system that must have no adverse effect on
the natural environment as well as having the affirmative capability of firesuppression. As a result, we have successfully developed the NN100 system, which
employs nitrogen gas, an agent that occupies 78% of the air. The NN100 system has
the capability for both environmental protection and fire suppression required forfire protection systems in this new stage.
Furthermore, the NN100 system has been provided with a high level of safety forhuman beings and a high cost-performance in accordance with our development
concept. The NN100 system will be a ‘standard’ fire suppression system in the futuresince the NN100 system is friendly to both human beings and our planet.

Package type available

INTERNATIONAL RECOGNITION
Underwriters Laboratories Inc. (UL)
National Fire Protection Association (NFPA)US Environment Protection Agency (US EPA)
Fire Protection Equipment and Safety Center of Japan (FESC)
ISO has adopted Nitrogen gas (IG-100) in ISO 14520

How is the fire extinguished?

System Configuration
Discharge indicator

By volume, air contains approximately 21% oxygen, 78% nitrogen, and 1% other gases. Continuous
combustion requires more than 15% of oxygen concentration by volume. The NN100 system, byManual release switch

discharging nitrogen gas into the application, reduces the oxygen concentration to less than 13.9% so that

Abort switch
Fire detector

combustion is suppressed.
Notification
appliance（Bell）

Caution indication on door

Gas proportion in the airOxygen

Before discharge

Nitrogen

Others21%

Zone 278%
Zone 1

Control panel

After discharge

Selector valve

Pressure switch

more than
85.1%

less than
13.9%

Safety vent

Cylinder valve solenoid

Is there any physiological effect on humans?

Pressure relief damper

Zone-1

Zone-21%

Side wall discharge nozzle
Pressure gaugeThe Chemicals Evaluation and Research Institute (CERI, Japan) tested for the safety of humans under suchconditions and reported that there is no physiological effect on humans when the nitrogen gas isActuating cylinders

discharged.

Cylinder valve

Pilot cylinder

The National Fire Protection Association (NFPA, USA) states that unnecessary exposure of humans to low
oxygen atmospheres shall be avoided. The NFPA stipulates the human exposure to low oxygenN2 cylinders

atmospheres in the table below.

The unique side wall type discharge nozzle provides flexibility in piping compared to the pendant typedischarge nozzle.

Human exposure in low oxygen atmospheres, NFPA 2001, 2012 edition
Oxygen concentration designed
by inert gas agent systems

12%

10 to 12%8 to 10%

8% or below 8%

Occupancy of area normally

AllowedAllowedNot Allowed

Not Allowed

Limited human exposure time

5 minutes

3 minutes

30 seconds

Shall not be exposed

Typical Operation Flow Chart
Manual operation
by a human

The NN100 oxygen concentration will be between 10 to 13.9%.

Automatic operation
by fire detectors

Fire occurred

Manual release switch
activated

Alarm signals received from firedetectors

Longer fire suppression time
HVAC shutdown andAir duct damper activated

The specific weight of nitrogen gas is as heavy

Power shutdown

as that of air, which creates an even distribution
for longer retention of gases in a room.

Start of discharge

This assists in preventing the fire from re-igniting.

25.0

800

Pilot cylinder opened

Oxygen concentrationin the room
15.0600

10.0400(°C)

Oxygen concentration (%)

20.0Fireextinguishment

N2 gas discharged
200060N2 gas cylinder opened

Pressure relief damper opened

0.00

Actuating cylinder valve solenoid activatedSelector valve opened

1000

120 sec.

Firetemperature

System suspended if abort switch
activated

Notification appliances activatedEnd of discharge

5.0

Delay time (if configured)

120

180

Time (sec.)

2403001800

Fire suppressedAcoustic effect on precision instruments

Applications

At the convention held by the Architectural Institute of Japan on September 11th 2010, an article entitled

The NN 100 system features make it suitable for applications where valuable property is stored,"Study on the affection of sound environment to precision instruments" was presented.

such as Museums, Archives, System Operation & Control Rooms, Computer Server Rooms, and ElectricalRooms.

The article states that noise impact on computer hard disc drive (HDD) was verified by simulator and thepossibility of potential damage to HDD by sounds higher than 110dB was found. The article mentions thatthe discharge sound of an inert gas fire suppression system may affect HDD. Although the acoustic effecton HDD has no relation to the fire suppression effect, when gaseous fire suppression systems are designed,
the noise effect and its countermeasure should be considered with end-users, architects, and contractorsfor every case.

Countermeasures for noise effect
In order to protect HDD against potential noise damage, comprehensive countermeasures are required.
Generally, the following countermeasures might be recommended.

Specifications

1. Sound and vibration insulation on HDD rack
(i.e. absorption of sound and vibration)
Protection of
HDD against soundenvironment

2. Take actions for HDD protection before gas discharge(i.e. stop HDD operation, save magnetic head)
3. Reinforcement of HDD against noise, data replication
4. Reduction of gas discharge noise

Agent

99.99% nitrogen

Agent supply

Industrial use

Design concentration

33.6% for Class A

40.3% for Class B & C

Agent quantity required

0.41 m3/m3 for Class A

0.52 m3/m3 for Class B & C

Cylinder gas filling pressure

30Mpa at 35°C

Agent volume per cylinder

20.3m3 at 20°C

Form of agent in storage

Vapor

Secondary pressure

Noise reduction nozzles

10.8Mpa at 40°C

Piping class

Sch. 80

For the above countermeasure 4, we developed noise reduction nozzles which achieve a gas discharge

Discharge timenoise level lower than 100dB*. Both pendant type and side wall type are available.

Ozone depletion potential

0*Measured at 1 meter distance from a nozzle, 45 degrees angle from radial axis, 20Hz to 20kHz.

Global warming potential

0Toxicity

No

Visual difficulties caused by agent discharge

NoNoise Reduction Nozzles

Features of noise reduction nozzles

120 seconds for Class A and C

60 seconds for Class B

Reduce effect of gas discharge noise on precision instruments
No change in fire suppression performance

Engineered TypeEasy replacement of existing discharge nozzles with
the noise reduction nozzles
Replacement of discharge nozzles of existing installationsPendant TypeSidewall Type

Noise reduction nozzles are compatible with NN100 standard discharge nozzles,
so that they can be replaced.
Coverage area and diffusibility of noise reduction nozzles are equal to those of standard nozzles.
Specialized pipe arrangement is not required as the nozzles are compatible. (Depending on the site
installation conditions, pipe support might be necessary.)

Package Type