Specially developed design criteria for MEP consultants & Architects to size & design ventilation system. These criteria when followed with Chemtronics ECO odour destruction system, gives the best results. Use PROSOFT software to select the most optimum model. Also technical specifications, tender BOQ & flow diagrams are available.

1. Design Criteria [DC]
Exhaust Air Odor Control System
- STP
- OWC
- Garbage Collection Room
- Waste Segregation Room
- Wash Room
Note: Given design criteria are not universal. These are only applicable for “Chemtronics” “Capture & Treat” Technology.

2. Exhaust Air
Performance
Contributing Factors
For
- Odor
- Microbes
- Pollutants
- Toxic Gases
- Oil & Grease (Kitchen)
10%
20%
15%
10%
10%
5%
5%
20%
5%
9 PERFORMANCE CONTRIBUTING FACTORS
Ozone Generator Technology 10% Concentration, Strength & Power 20%
Ozone Chemistry With Subject 15% Ozone Reaction Efficiency 10%
Point Of Integration 10% Pre & Post Conditioning 5%
Complimentary Technology Mix 5% Reaction Contact Time 20%
Capacity Of Ozone Generator 5%
Copywrite : This entire Presentation is a copywrite of M/S Chemtronics. It is strictly prohibited to copy or republish
in any form without written permission from Chemtronics

3. 06 Design Criteria – STP Room Exhaust
1. ACPH (Total STP Room Volume) : Minimum 30 (+/- 10%) - Option 1
2. ACPH (STP Room Vol. – Tank Vol.) : Minimum 50 (+/- 10 %) - Option 2
3. Exhaust Air Velocity : Maximum 6.5 m/s (+/- 10 %)
4. Exhaust Duct Length : Minimum 32 M (+/- 5 %)
5. Mechanical Exhaust Air : (ACPH) x (STP Room Volume)
6. Mechanical Fresh Air : 80 % of Exhaust air.
Important Critical Design Criteria’s For STP Room Exhaust Air Odor Control System

4. 07 Design Criteria – OWC Room Exhaust
1. OWC Room Area per Machine : Minimum 50 m2 (+/- 10%)
2. OWC Room Height : Minimum 4.0 m (+/- 10%)
3. ACPH : Minimum 50 (+/- 10 %)
4. Exhaust Air Velocity : Maximum 3.5 m/s (+/- 10 %)
5. Exhaust Air Duct Length : Minimum 30 m (+/- 5 %)
6. Mechanical Exhaust Air : (ACPH) x (OWC Room Vol.) + OWC Exhaust
7. Mechanical Fresh Air : 80 % of Exhaust air.
Important Critical Design Criteria’s For OWC Room Exhaust Air Odor Control System

5. 05 Design Criteria –
Garbage Collection Room| Waste Segregation Room | Wash Rooms
1. ACPH : minimum 20 (+/- 10%)
2. Exhaust Air Velocity : maximum 7.0 m/s (+/- 10 %
3. Mechanical Exhaust Air : (ACPH) x (Room Volume)
4. Exhaust Duct Length : minimum 10 m (+/-10%)
5. Mechanical Fresh Air : 80 % of Exhaust air.
Important Critical Design Criteria’s For Exhaust Air Odor Control System

6. 02 Design Criteria – Commercial Kitchen
1. Exhaust Air Velocity : 3.0 m/s (+/- 10 %)
2. Exhaust Duct Length : 25 m (+/-10%) [With / Without ESP]
Important Critical Design Criteria’s For Kitchen Exhaust Air Grease & Odor Control System

7. Partial List of Exhaust Gases - Sulphur compounds
Compound Formula Odor threshold (ppb)
Hydrogen sulphide H2S 0.4
Carbon disulphide CS2 2.8
Methane thiol CH3S 1.0
Ethane thiol C2H5S 0.2
Propane thiol C3H7S 0.5
Dimethyl sulphide CH3-S-CH3 1.0
Diethyl sulphide C2H5-S-C2H5 0.25
Dimethyl disulphide CH3-S-S-CH3 0.3 – 10
Dimethyl trisulphide CH3-S-S-S-CH3 -

8. Partial List of Exhaust Gases – Ammonia compounds
Compound Formula Odor threshold (ppb)
Ammonia NH3 37
Methylamine CH3NH2 1 – 50
Ethylamine CH2H5NH2 2,400
Propylamine C3H7NH2 7
Dimethylamine (CH3)2NH 20 – 80
Trimethylamine (CH3)3-N 0.2
Indol C8H6N 1.5
Skatol C9H8N 0.002 – 1.0
Fatty acids
Vinegar acid CH3COOH 37
Butter acid C2H5COOH 0.05 – 2.0
Valerian acid C3H7COOH 4,600

9. Partial List of Exhaust Gases – Aldehyde & Ketone Compounds
Compound Formula Odor threshold (ppb)
Formaldehyde CH2O 37
Acetealdehyde CH3CHO 0.005 – 2.0
Acetone CH3-CO-CH3 4,600
Butanone C2H5-CO-CH3 270

10. 16 Points - Odor Control System Design
1. Capacity & treatment technology of STP.
2. Area & volume of OWC / STP.
3. Constituent of exhaust gases.
4. Magnitude of each gases from exhaust.
5. Efficiency of STP operation.
6. Identification of testing locations. {One may be inside
(Indoor) the OWC & STP & other outside (Outdoor)}.
7. Air changes per hour [ACPH]
8. Length of the Exhaust duct / contact chamber.
9. Distance between testing / sampling & exhaust duct opening.
10. No. of sample testing & their mean/average.
11. Ambient temperature, humidity
12. Air flow & direction – Laminar, static and breeze. For dilution
level.
13. Constant Variation in the quantum of odorous gases. Today
we are sampling, it is most likely
14. after few days quantum may increase. (Due to time,
efficiency, performance, etc.)
15. Fresh air & exhaust air quantum.
16. Ozone integration technique.

11. Oxidation Chemical Formula
H2S + O3 → SO2 + H2O
2NH3 +4O3 → NH4NO3 +4O2 +H2O

12. Chemtronics Innovation Basis
1. Literature Review
2. Data from past installed Sites
3. Diversifies Experience
4. Stoichiometric Mass Balance Calculation

13. General
Arrangement
Drawing
Exhaust Air Treatment
- Odor Reduction by 80% (+/-10%)
- Without any Feed Gas
-

14. General
Arrangement
Drawing
Exhaust Air Treatment
- Odor Reduction by 80% (+/-10%)
- Without Any Feed Gas
-

15. General
Arrangement
Drawing
Exhaust Air Treatment
- Odor Reduction by 80% (+/-10%)
- With Oxygen As a Feed Gas
-

16. General
Arrangement
Drawing
Exhaust Air Treatment
- Odor Reduction by 80 % (+/-10%)
- With Oxygen As a Feed Gas
-

17. Partial Client List
https://www.chemtronicsindia.com/client-list-ozone.html#Air-ozonation-Exhaust-Air-Odor-
Control

18. Thank You
Chemtronics Technologies
(India) Pvt. Ltd.
Mr. Sunil Shah
022 – 2825 9933
+91– 932 123 4527
sunilshah.Chemtronics
solution@chemtronicsindia.com www.chemtronicsindia.com
Note: Given design criteria are not universal. These are only applicable for “Chemtronics” Models.