1. HOW NAD - RDD duct diffuser

2. What you need to know before you start?
HOW NAD - RDD duct diffuser
What you need to know before you start?
What type of application?
What is the usage ? (heating/air conditionning/Ventilation)
What is the installation height?
Are there any obstacles?
What is the total airflow rate?

3. RDD Perforated duct diffuser
HOW NAD - RDD duct diffuser
RDD
Perforated duct diffuser
Perforation adapted to the configuration of the room
Ideal for open ceiling applications
Maximum installation height 60ft (18 m )
Minimum installation height 13ft (4.0 m)

4. Adaptive perforations
HOW NAD - RDD duct diffuser
Adaptive perforations

5. HOW NAD - RDD duct diffuser
Large scale results

6. Selection steps Determine location of ducts Determine the Ø Diameter
HOW NAD - RDD duct diffuser
Selection steps
Determine location of ducts
Determine the Ø Diameter
Balance the air flow
Provide construction drawings

7. Sample of calculation Zone 1 : 4160 m3/h (2450 cfm)
HOW NAD - RDD duct diffuser
Sample of calculation
Zone 1 : 4160 m3/h (2450 cfm)
Zone 2 : 1232 m3/h (725 cfm)
Height of underside duct: 13ft (4 m)

8. Example of layout Determine placement of ducts Determine the Ø
HOW NAD - RDD duct diffuser
Example of layout
Determine placement of ducts
Determine the Ø
Balance air flow

9. Recommendations for direct connection
HOW NAD - RDD duct diffuser
Recommendations for direct connection
Determine placement of ducts
Determine the Ø
Balance air flow

10. Recommendation for the connection between NAD and spiral duct
HOW NAD - RDD duct diffuser
Recommendation for the connection between NAD and spiral duct
Determine placement of ducts
Determine the Ø
Balance air flow
The supply duct exceed the wall an exact length of 2’’1/4 (58 mm)

11. Optimal layout The RDD covers the entire zone 5m
HOW NAD - RDD duct diffuser
Optimal layout
Determine placement of ducts
Determine the Ø
Balance air flow
The RDD covers the entire zone 5m

12. Selection of diameter Determine placement of ducts Determine the Ø
HOW NAD - RDD duct diffuser
Selection of diameter
Determine placement of ducts
Determine the Ø
Balance air flow

13. Diameter selection Zone 1 : Composed of 2 sections Section n° 1 :
HOW NAD - RDD duct diffuser
Diameter selection
Determine placement of ducts
Determine the Ø
Balance air flow
Zone 1 : Composed of 2 sections
Section n° 1 :
- 4 x Ø 556 mm
Zone 2 : Composed of 1 section
- 4 x Ø 353 mm

14. RDD Rules Install 1 Reducer or Damper every 50 ft
HOW NAD - RDD duct diffuser
RDD Rules
Determine placement of ducts
Determine the Ø
Balance air flow
Install 1 Reducer or Damper every 50 ft
or every 10 active sections
Prévoir un réduit ou clé de balancement tous les 25’ max

15. NAD Spec Chart Tableau NAD_Specifications RDD Identification Brand
HOW NAD - RDD duct diffuser
NAD Spec Chart
Tableau NAD_Specifications RDD
Identification
Brand
Model
Airflow
Ceiling height
Height below the duct
Room Temp
in winter
Room R.H. %
in winter
Temp. in duct
In summer
Tempin duct in summer
Notes
RDD-A
NAD Klima
RDD
1, 2, 3,4,5,6,7
RDD-B
RDD-C
1, 2, 3,4,5,6, 7
RDD-D
1, 2, 3,4,5, 6,7
Note :
1 – 3/8 threated rod will be supplied by contractor.
2 – The color of the diffuser must be selected from the RAL chart
3 – The diffusers perforations are made with a software to meet the performance needs
4- The aluminium suspension rails will be painted the RAL color chosen and supplied by the manufacturer.
5- The rod covers will be painted the RAL color chosen and supplied by the manufactuer.
6- The ducts will be acoustically insolated by the manufacturer.
7- Starter flange included
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16. Codification of RDD on plans
HOW NAD - RDD duct diffuser
Codification of RDD on plans
Air flow
TAG DIFFUSER
RDD-A
85 l/s per section
Ø 400
1500
Ø of the duct
Length of the duct
A- Ø550
85 l/s par section
Ø 500
1500
RDD-A
85 l/s par section
Ø 400
1500

17. Codification HOW NAD - RDD duct diffuser
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18. Specification Available online in word format www.nadklima.com
HOW NAD - RDD duct diffuser
Specification
Available online
in word format