Roam Huwa-San FOGGER User manual

MANUAL
COVID-19 prevention

ALWAYS PAY ATTENTION TO THE FACT THAT YOU ARE WORKING IN VAPOUR PHASE ENVIRONMENT.
DISINFECTION IN VAPOUR PHASE CAN ONLY BE EXCECUTED BY OPERATORS TRAINED BY THE SUPPLIER OR HIS
OFFICIAL APPOINTED REPRESENTATIVES.
ALWAYS WEAR APPROPRIATE PERSONAL PROTECTION EQUIPMENT (EG. GLOVES AND ADEQUATE EYE
PROTECTION) WHEN HANDLING THE PRODUCT.
ALWAYS WEAR AN APPROPRIATE GAS MASK WHEN ENTERING A ROOM WHERE >2 PPM HYDROGEN PEROXIDE
VAPOUR IS STILL PRESENT. THE ROOM CAN ONLY BE RELEASED AFTER DISINFECTION WHEN THE MEASURED
HYDROGEN PEROXIDE CONCENTRATION IS < 1 PPM.
General:
This product must be earthed.
Environmental operating conditions: 10-35°C
Maximum altitude: 2000m
Indoor use
Warnings:
Read operating instructions before use of the
equipment.
This symbol indicates special attention points
to the user.
Repair:
Repair shall only be done by the manufacturer’s appointed or
recognized service technician. For details contact the dealer.
Internal fuse is not user replaceable.
Transport:
Remove any liquids before transport.
! IMPORTANT NOTICE !

Manual • HUWASAN©FOGGER
MADE IN BELGIUM
MANUAL Huwa-San© Fogger
1. The Huwa-San©Fogger manual.......................................................................................................... 5
2. Disclaimer............................................................................................................................................. 6
3. Safety Guidelines .................................................................................................................................. 7
4. The Huwa-San©Fogger........................................................................................................................ 9
4.1 General ............................................................................................................................................................ 9
4.2 Intended use .................................................................................................................................................. 9
4.3 Benefits............................................................................................................................................................ 9
4.4 Package content ......................................................................................................................................... 10
4.5 Main components....................................................................................................................................... 10
4.6 Accessories .................................................................................................................................................. 11
5. Working with the Huwa-San©Fogger .............................................................................................. 12
5.1 Training and certification ......................................................................................................................... 12
5.2 Personal protection equipment ............................................................................................................. 12
5.3 Room preparation ...................................................................................................................................... 12
5.4 Preparing the Huwa-San©Fogger for disinfection .......................................................................... 13
6. Disinfection procedure...................................................................................................................... 14
6.1 Start of disinfection procedure .............................................................................................................. 14
6.2 Disinfection without documentation..................................................................................................... 15
6.3 Disinfection with documentation........................................................................................................... 17
6.4 After disinfection......................................................................................................................................... 20
6.5 Managing settings...................................................................................................................................... 22
6.6 Emergency stop and restart................................................................................................................... 24
7. Maintaining the Huwa-San©Fogger................................................................................................. 25
7.1 Maintenance................................................................................................................................................. 25
7.2 Troubleshooting.......................................................................................................................................... 25
7.3 Disposal......................................................................................................................................................... 25
8. Technical Data .................................................................................................................................... 26
8.1 Technical characteristics......................................................................................................................... 26
8.2 Warranty and service................................................................................................................................ 26
8.3 Compliance ................................................................................................................................................... 27

• Manual Huwa-San©Fogger • 5
1 THE HUWA-SAN© FOGGER MANUAL
This user manual provides instructions to disinfect rooms (hospital rooms, hotel rooms, public
facilities,... ) by nebulization with the Huwa-San© Fogger, including:
- Preparation of the rooms to be disinfected;
- Preparation of the Huwa-San© Fogger before disinfection;
- Disinfection process with Huwa-San© Fogger;
- Preventive maintenance of the Huwa-San© Fogger;
This manual is exclusively intended for trained staff operating the Huwa-San© Fogger.
The first sections of this manual include the safety guidelines and a functional description of the
Huwa-San Fogger. Make sure to read these sections with care to familiarize yourself with the
precautions and the function and location of various parts of the Huwa-San© Fogger.
Figure 1: front of the Huwa-San© Fogger Figure 2: back of the Huwa-San©Fogger
Figure 1 & 2 show the orientation convention. Wherever you stand relative to the Huwa-San©
Fogger, the indications ‘Front’, ‘Back’, ‘Right’ and ‘Left’ are always as shown in these figures.
This manual is also available electronically as a PDF-file. Please contact Roam Technology directly
to receive the electronic manual. Also for specific information about Huwa-San© Fogger disinfection
solutions or for additional information and support, please contact Roam Technology.
Roam Technology NV • Geleenlaan 24 • 3600 Genk • Belgium
T: [phone] • [e-mail] • www.roamtechnology.com

6 • www.roamtechnology.com
2 DISCLAIMER
• Failure to follow the instructions in this manual and the damage that may result from it,
voids the warranty of your Huwa-San© Fogger.
• The warranty does not apply if the defect results from an operational intervention in the
device, normal wear and tear, negligence or lack of maintenance.
• The manufacturer will not be held liable for any bodily harm or material damages caused
by inappropriate or abnormal use of the devise contrary to the precautions recommended
in chapter 3 Safety Guidelines (non-exhaustive list).
• For general terms of sale, visit www.roamtechnology.com
Huwa-San TR-12,5
Safety Data Sheet
according to Regulation (EC) No. 453/2010
Date of is
sue: 30/11/2010 Revision date: 17/07/2020 Supersedes: 2 8/12/2016 Version:3.0
17/07/2020
EN(E nglish)
1/7
SECTION 1: Identification of the substance/mixture and of the company/undertaking
1.1. Product identifier
Product form
:
Mixture
Product name
:
Huwa-San TR-12,5
Synonyms
:
Stabilized Hydrogen Peroxide
Product group
:
Trade product
1.2. Relevant identified uses of the substance ormixture and uses advised against
1.2.1. Relevant identified uses
Main use category
:
Industrial use
Function or use category
:
Disinfectant
1.2.2. Uses advised against
No additional information available
1.3. Details of the supplier of the safety data sheet
ROAM TECHNOLOGY NV
I.Z. Poort Genk 6835, Geleenlaan 24
3600 Genk / Belgium
T 0032 89 44 00 42
[email protected] - www.roamtechnology.com
1.4. Emergency telephone number
Country
Organisation
Address
Emergencyphone number
REPUBLIC OF IRELAND
National Poisons Information Centre
Beaumont Hospital, PO Box
1297, Beaumont Road, Dublin
[phone]
UNITED KINGDOM
NPIS (National Poisons Information Service)
-
[phone]
111
SECTION 2: Hazards identification
2.1. Classification of the substance or mixture
Classification according to Regulation (EC) No. 1272/2008 [CLP]Show CLP information + DPD classification in section 2.1
Eye Dam. 1
H318
Full text of H-phrases:s ee section 16
Adverse physicochemical, human health and environmental effects
No additional information available
2.2. Label elements
Labelling according to Regulation (EC) No. 1272/2008 [CLP]
Hazard pictograms (CLP)
:
GHS05
CLP Signal word
:
Danger
Hazard statements (CLP)
:
H318 - Causes serious eye damage
Precautionary statements (CLP)
:
P264 - Wash hands thoroughly after handling.
P280
- Wear eye protection, face protection, protective clothing, protective gloves
P301+P312
- IF SWALLOWED: call a POISON CENTER or doctor/physician if you feel unwell
P305+P351+P338
- IF IN EYES: Rinse cautiously with water for several minutes. Remove
contact lenses, if present and easy to do. Continue
rinsing
P337+P313
- If eye irritation persists: Get medical advice/attention.
P501
- Dispose of contents/container to local and/or national regulations
2.3. Other hazards
Other hazards not contributing to the
classification
:
Danger of decomposition under influence of heat. Maintains combustion of flammable
substances.
Risk of decomposition in contact with incompatable materials (metal oxides,m etal
ions (e.g.Mn, Fe, Cu, Ni, Cr, Zn), metal salts, bases, reducing agents).
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Huwa-San©Fogger • CHECKLIST by Roam Technology
Geleenlaan 24 • 3600 Genk • Belgium • [phone] • [email protected] • ww w.roamtechnology.com
Checklist Room Disinfection with Huwa-San©Fogger
Theroom disinfection checklist must be followed, signed by the operator of the Huwa-San©Fogger and the supervisor and kept in a log book.
Huwa-San©Fogger • CHECKLIST
Description task Tickb ox: Operator Supervisor
Room preparation
Ensure the ventilation system is switched off and all ventilation outlets are appropriately covered.
Place the cover cap over the smokedetector and if necessary disconnect the smoke detector.
Discard all waste and remove edible products.
Assure all surfaces are visibly clean.
Remove or seal containers with liquids or chemicals (detergents, bleach, etc.).
Obtain authorization from supervisor that Huwa-San decontamination can proceed.
Display “NO ENTRY” sign on all access points detailing cyclestart and finish times.
Assure that no people are in the room. All corners must be visible from the standing point, otherwise
personally check the invisible areas (ensuite toilet, bathroom, etc.).
Close all windows. Ensure that openings or gaps to other rooms are sealed using tape.
Disinfection protocol
Position Huwa-San Foggerappropriately in the room.
Followthe Roam Technology instruction manual.
Commence decontamination cycle and leave the area within the time indicated on the display.
Seal the door with tape.
Start disinfection SIGN OFF Name Date Signature
Operator
Supervisor
After disinfection
When disinfection is completed respect contact time.
Assure the concentration H2O2< 2 ppm before entering the room or enter with adequate personal protec-
tion equipment. Only release the room when the concentration H2O2is < 1 ppm.
Remove coverings from ventilation outlets and restart ventilation systems.
Remove cover from smokedetector and reconnect smoke detector.
Remove “NO ENTRY”signs and tape used to seal openings and gaps.
Remove and store Huwa-San Foggerand Huwa-San TR-12.5 safely.
Complete entries in logbook.
COMPLETION SIGN OFF Name Date Signature
Operator
Supervisor
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MADE IN BELGIUM
Huwa-San© Fogger • SAFETY C ARD by Roam Technology
Geleenlaan 24 • 3600 Genk • Belgium • [phone] • [e-mail] • ww w.roamtechnology.com
The Huwa-San© Fogger in combination with the effective biocide Huwa-San© TR-12,5 stands for a reliable and
easy to use whole room disinfection. It enables users to disinfect walls and floors in private, public and industrial
areas. This information sheet reports possible safety risks and comprises measurements to ensure a safe use of
the Huwa-San© Fogger.
Huwa-San© TR-12,5 is a hydrogen peroxide based biocide. Exposure to vaporized hydrogen p eroxide below
the indicated concentration limits without exceeding the maximum safe exposure time, poses no health risk to
individuals.
Huwa-San© Fogger • SAFETY CARD
Concentration H2O2 in the air Maximum safe exposu re time
Safety Limits 1, 2 1 ppm * 8 h
2 ppm * 15 min
1. Turn off the ventilation
system.
2. Make sure no persons are in
the room.
3. Turn on the device and leave
the room immediately.
4. Seal the door and other gaps
with tape.
5. Attach the door hanger with
“No entry” sign to indicate the
room cannot be entered.
6. Only enter when H2O2
concentration is < 2 ppm
otherwise wear appropriate
PPE.
Use biocides safely. Always read the label and product information before use
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dummy
cuttingborder
bleedborder
1
DEURHANGER
RONDGROOT84x280mm
Opgelet!
Deze ruimte wordt momenteel gedesinfecteerd
en is niet toegankelijk. Deze ruimte zal opnieuw
beschikbaar zijn om ...
........u.........
( ........ / ........ / ........ )
Attention!
Cette zone est actuellement en cours de désin-
fection et n’est pas accessible. Cet espace sera à
nouveau disponible (voir ci-dessus).
Only release the room when the measured H2O2 concentration is < 1 ppm.
1Safety data Sheet 2 Safety card 3 Huwa-San Fogger checklist
Example
Example
Example

• Manual Huwa-San©Fogger • 7
3 SAFETY GUIDELINES
Read and follow the manual, the safety data sheet1(SDS) and the safety card2carefully
before starting to work with the Huwa-San© Fogger and Huwa-San©TR-12,5.
Make sure the safety data sheet, the manual and safety card are always accessible to
the user before and during disinfection.
Make sure the user and supervisor follow and sign the Huwa-San©Fogger checklist3
before starting the disinfection procedure.
Precautions before start
During the process the Huwa-San Fogger will distribute hydrogen peroxide vapour:
1. This means that during the process NO PEOPLE are allowed in the room.
2. This means that the vapour is penetrating through cracks and holes.
3. In surrounding rooms people shall be protected in such a way that no vapour can penetrate
through to other rooms.
4. Control that fire alarm indicators are switched off by means of a cap protecting it in the
room or by disabling the system centrally if possible.
5. Ventilation systems that always provide fresh air do not need to be sealed. However, if the
air is re-circulated, both the outlet and the inlet of the air need to be sealed or disabled.
6. In rooms that have overpressure the inlet of fresh air needs to be disabled.
7. Experience has learned that the disinfection process can be insufficient when bacteria are
embedded in a wet substrate.
8. Visible dirt, dirty spots and wet spots need to be cleaned and dried prior to starting the
process and the towels used for this need to be thrown away and transferred to the
laundry service.
General precautions
1. Wear the indicated personal protection equipment as specified in the disinfection protocol.
2. Use only Huwa-San©TR-12,5 developed for the Huwa-San© Fogger in combination with
the device.
3. Remove the bottle from the Huwa-San© Fogger, before relocating or transporting the
device.
4. Follow the steps indicated in the disinfection protocol to assure the bottle containing
Huwa-San©TR-12,5 is held vertically at all times.
5. Keep children away from the Huwa-San© Fogger and do not let visitors contact the device
or power cord.
6. Store the Huwa-San© Fogger when not in use in a dry, high, or locked-up place, out of the
reach of children. By preference between 10°C and 35°C.
7. Use the power cord supplied with the Huwa-San Fogger for safe operation.

8 • www.roamtechnology.com
8. Never carry the Huwa-San© Fogger by the power cord and never pull the power cord to
disconnect it. Keep the power cord away from heat, oil and sharp edges.
9. Do not put items or liquid in the openings of the Huwa-San© Fogger (nozzle, opening for
nozzle head, air inlet).
10. Do not pour fluid over the Huwa-San© Fogger.
11. Do not open the Huwa-San© Fogger, there are electrical parts under voltage and rotating
parts inside.
12. Do not use the Huwa-San© Fogger with broken or damaged parts (including power cord).
13. Make sure the electric current and voltage match your country’s current and voltage
standards.
14. Guard against electric shock. Prevent body contact with grounded surfaces (e.g. pipes,
radiators,..).
15. Consider environmental influences. Do not expose electric tools to rain. Do not use electric
tools near flammable liquids or gases.
16. Follow basic safety precautions when using electric devices to protect yourself against
electric shock, danger of injury and fire.
17. Keep working area clean. Cluttered areas invite injuries.
The device diffuses a chemical substance, before using the product, read the safety data-sheet
carefully. Take necessary precautions and wear appropriate personal protective gear.
Hazard pictograms:
GHS05: corrosion
Hazard warnings:
H318: Causes serious eye damage.
Precautionary warnings:
• Keep out of reach of children.
Avoid breathing dust/fume/gas/mist/vapours/spray
• Wear protective gloves/protective clothing/eye protection/face protection.
• IN EYES: rinse carefully with water for several minutes. Remove contact lenses, if present
and easily done. Continue rinsing.
• Dispose of contents/container according to local regulations.
For more information we refer to the Safety Data Sheet (SDS) of the product.

• Manual Huwa-San©Fogger • 9
4 THE HUWA-SAN© FOGGER
4.1 General
Huwa-San© Fogger is a solid, reliable and easy to use whole room disinfection device. It
enables users to disinfect surfaces in private, public, industrial areas and other spaces in a quick
and efficient fashion.
Huwa-San© Fogger uses Huwa-San©TR-12,5 (12.5% H2O2) as disinfectant, which meets the
highest EN disinfection standards for bactericides, fungicides and virucides. The device’s excellent
disinfection results, its clear digital display and its mobility make Huwa-San© Fogger the most
intuitive and user-friendly option on the market today.
Huwa-San© Fogger disinfects volumes up to 142 m³ per liter with a max. fogging time of 30 minutes.
Huwa-San© Fogger is not a medical device.
4.2 Intended use
Huwa-San© Fogger can be used with Huwa-San©TR-12,5, which is a 12.5% hydrogen peroxide
solution. For more details, refer to the technical data of Huwa-San©TR-12,5.
Huwa-San© Fogger efficiently disinfects surfaces and rooms by nebulization. Huwa-San© Fogger is
suited for patient rooms, retirement homes, waiting rooms in private practices, catering industry,
hotel rooms, wellness areas, classrooms, gyms, etc.
Huwa-San© Fogger is suitable for indoor use only.
4.3 Benefits
• Efficient, fast, simple room disinfection technology
• Room is disinfected – high touch, low touch and surfaces that are difficult to reach
• Can be applied proactive, scheduled or in case of an outbreak
• Excellent material compatibility (Non-corrosive at user-levels)
• Low concentration of ingredient needed in the air
• No harmful residues (only water and oxygen)
• User-friendly design

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4.4 Package content
• 1 Huwa-San©Fogger
• 1 nozzle head
• 1 power cord
• 1 user manual
4.5 Main components
Huwa-San© Fogger
device socket
ventilation grid
ON/OFF switch
identification plate
nozzle head
latch
nozzle head
user manual
power cord

• Manual Huwa-San©Fogger • 11
4.6 Accessories
To check efficient dispersion of Huwa-San©TR-12,5 throughout
the room, locate Roam Technology test strips in corners or
on closets. These test strips cannot be used to measure the
concentration, only to demonstrate the distribution of the
product in difficult to reach areas.

12 • www.roamtechnology.com
5. WORKING WITH THE HUWA-SAN©FOGGER
Always wear gloves and adequate eye protection when handling a hydrogen peroxide
solution. Always wear a gas mask and cover-all when entering a room where >2 ppm
hydrogen peroxide vapour is still present. The room can only be released after
disinfection when the measured hydrogen peroxide concentration is < 1 ppm.
5.1 Training and certification
Disinfection by fogging should only be performed by trained and certified personnel. Use biocides
safely. Before use, read the label and product information.
5.2 Personal protection equipment
Personal protection equipment must meet the following standards:
• Respiration: full face mask / gas mask with filter type B, which complies with standard EN
136:1998
• Eyes: chemical goggles / safety goggles, meeting standard EN 166:2001.
• Hands: gloves made of natural rubber, nitrile rubber, butyl rubber, polyethylene or PVC,
which comply with the standard EN 374-1: 2003
• Body: Cover-all of corrosion-resistant protective clothing
5.3 Room preparation
• During the application, no people can be present in the room or enter the room.
• Screen off surrounding spaces containing people and if needed, seal off in such a way that
the aerosol cannot penetrate to surrounding spaces.
• Leave no edibles or food in the room during disinfection.
• Assure no pets, birds or other animals are present in the room during disinfection.
• Discard all waste intended for disposal prior to disinfection.
• Bring textile that needs to be washed outside the room.
• Dry all wet spots and clean real pollution (blood and body liquids) the classic way.
• Switch off or cover fire detectors. Some types of fire detectors perceive peroxide vapour
as smoke and will set off. Sensitive sensors in the room should be covered or taped to
prevent damage.

• Manual Huwa-San©Fogger • 13
• Effectively seal doors and gaps with tape. In rooms that by definition have overpressure,
the supply of fresh air must be switched off.
• Thoroughly clean surfaces, equipment, material and pipes first, rinse any cleaning agent
with clean water. Remove all excess water. Make sure visible dirt and wet spots are cleaned
and dried before fogging the room.
• Open drawers and cupboards and remove loose materials and packaging materials.
• Make sure the room is at room temperature or temperatures above 10 ° C.
5.4 Preparing the Huwa-San© Fogger for disinfection
• Place the Huwa-San©Fogger on a stable surface. Make sure the inlet airflow is not
obstructed.
• Press the latch and take the nozzle out of its cradle.
• Insert the flexible straw into the bottle ‘Huwa-San©TR-12,5’ and screw the nozzle clockwise
onto the bottle.
• Put the nozzle back into its cradle and press firmly until it clicks into position.

14 • www.roamtechnology.com
6. DISINFECTION PROCEDURE
6.1 Start of disinfection procedure
1. Connect the power cord to the back of the Huwa-San© Fogger and insert the plug into a wall
outlet. Always verify if the voltage indicated on the identification plate (see Figure 4.5 on 10),
corresponds to the local mains voltage before you connect the unit. It is only allowed to use the
fogger with the original power cord (with ferrite ring) to meet the EMC requirements.
2. Check if sufficient product is present in the Huwa-San© bottle to complete the entire disinfection
process for the selected room volume!
3. Set the ON/OFF switch (B) to the ON position.
4. Place the Huwa-San©Fogger in a corner of the room to be disinfected, the nozzle pointing to
the center of the room.
5. Windows Start-logo is shown.
6. Roam Technology splash screen is shown.
7. The start menu will appear. The start menu shows the data of the last disinfection, the system
date and time.
To start a disinfection procedure that does not need to be saved in the documentation list, see
6.2 Disinfection without documentation. To start a disinfection procedure that has to be saved
in the documentation list, see 6.3 Disinfection with documentation.

• Manual Huwa-San©Fogger • 15
6.2 Disinfection without documentation
8. Press “New disinfection”. 9. Subsequently press “No” for undocumented
disinfection. For documented disinfection
see 6.3 Disinfection with documentation.
10. The screen for entering the room size
appears with the last value of room size.
Enter the room size using the display
keyboard. Subsequently press “Next”.
11. The device reads the bottle ID.
12. The RFID-reader successfully identified the
tag. Press “Next” to continue.
13. If the device indicates the bottle contains
insufficient amount of product to disinfect
the room, attach new bottle or relocate to
smaller room.

16 • www.roamtechnology.com
14. If the device cannot read the bottle ID, an
error appears. If this screen appears see
7.2 Trouble shooting.
15. The countdown time appears.
16. Adjust the countdown time to the time
required for the operator to leave the room
using the slider (e.g. 1:30 min).
17. Press “Start disinfection”, the countdown
starts and the device will produce a
discontinuous beep.
18. The frequency of the beep will rise
during the countdown. At the end of the
countdown, product nebulization starts.
For actions after nebulization, see 6.4 After
disinfection.

• Manual Huwa-San©Fogger • 17
6.3 Disinfection with documentation
19. When choosing for disinfection with
documentation, it is recommended to
manage the presets. Manage presets by
pressing “Managing presets” in start menu.
20. Choose “Manage users” or “Manage rooms”.
21. Press “Manage users”, the user list opens. 22. Press “+ Add new user”. If you touch the
input field, a display keyboard is shown to
edit the names. After editing, press enter
and + “+Add new user”.
23. With “+Add new user”, users can be added,
edited or deleted.
24. After managing all users, press “Cancel”.

18 • www.roamtechnology.com
25. Choose “Manage rooms” and the room list
is shown. Press “ + Add new room”
26. When editing the name you can change the
keyboard layout with the bottom left key.
After filling in both fields, press enter.
27. Press “+ Add new room”, the room is added
in the room list.
28. Additional rooms can be added, edited or
deleted (e.g. Press “Edit”)
29. Edit room name or size and press “Save”. 30. The room list appears with adjusted name
or room size.

• Manual Huwa-San©Fogger • 19
31. Press “Cancel” to return to presets menu. 32. Use the left arrow to return to the start
menu. A documented disinfection can now
start, press “New disinfection”.
33. Press “Yes” for a documented disinfection. 34. Now choose a user from the users list
and a room from the room list or add a
new user and/or room by respectively
pressing “+ Add user” and/or “+Add room”.
Subsequently, press “Next”.
35. Assure enough product is in the bottle to
successfully disinfect the room, otherwise
attach new bottle. If ID was not recognized
see 7.2 Trouble shooting.
36. The RFID reader indicates the ID was
successfully recognized.

20 • www.roamtechnology.com
37. Adjust the countdown time with the slider
to the time required for the operator to
leave the room.
38. Press “Start disinfection”, the countdown
starts (identical procedure as non-
documented disinfection).
39. After countdown time, product nebulization
starts.
6.4 After disinfection
40. The device ceases nebulization when
100% is reached and the required volume
of Huwa-San©TR-12,5 is distributed in the
room. After nebulization, respect the contact
time. The concentration H2O2after contact
time depends on the ambient temperature,
room volume, and ventilation with fresh air.
Only enter the room if the concentration
H2O2< 2 ppm, otherwise wear appropriate
personal protection equipment (gas mask).
In case of doubt, use a sensor to measure
the H2O2concentration or wear a gas
mask. The room can only be released after
disinfection when the measured hydrogen
peroxide concentration is < 1 ppm.