1. HOW NAD - RRA duct diffuser

2. RRA Selection Slotted duct diffuser Ideal for open ceilings
HOW NAD - RRA duct diffuser
RRA Selection
Slotted duct diffuser
Ideal for open ceilings
Maximum installation height.
Eccentric rollers
Nozzle rollers
Installation height between
14 ft (4,3m)
and 30 ft (9 m)
Maximum installation
14 ft (4,3 m)

3. RRA Suspension Threaded rods Rail
HOW NAD - RRA duct diffuser
RRA Suspension
Threaded rods
Rail
Same type of suspension for other duct diffusers (RDD)
Cables
Wall mount

4. HOW NAD - RRA duct diffuser
Blends with structure

5. Selection steps Determine placement of ducts Reducer or damper
HOW NAD - RRA duct diffuser
Selection steps
Determine placement of ducts
Reducer or damper
Determine the Ø
Determine airflow per meter of slots
Determine the number of slots

6. Sample Calculation Zone 1 : 4160 m3/h (2450 cfm)
HOW NAD - RRA duct diffuser
Sample Calculation
Zone 1 : 4160 m3/h (2450 cfm)
Zone 2 : 1232 m3/h (725 cfm)
Height of underside of duct : 4 m

7. Example of layout Create a layout of the ducts Reducer or damper
HOW NAD - RRA duct diffuser
Example of layout
Create a layout of the ducts
Reducer or damper
Determine the Ø
Determine the airflow
Determine the number of slots

8. Recommendations for direct connection
HOW NAD - RRA duct diffuser
Recommendations for direct connection
Create a layout of the ducts
Reducer or damper
Determine the Ø
Determine the airflow
Determine the number of slots

9. Recommendations for direct connection
HOW NAD - RRA duct diffuser
Recommendations for direct connection
Create a layout of the ducts
Reducer or damper
Determine the Ø
Determine the airflow
Determine the number of slots

10. Recommendation for the connection between NAD and spiral duct
HOW NAD - RRA duct diffuser
Recommendation for the connection between NAD and spiral duct
Create a layout of the ducts
Reducer or damper
Determine the Ø
Determine the airflow
Determine the number of slots
The supply duct exceed the wall an exact length of 2’’1/4 (58 mm)

11. Optimal layout The RRA covers entirely the zone 5m
HOW NAD - RRA duct diffuser
Optimal layout
Create a layout of the ducts
Reducer or damper
Determine the Ø
Determine the airflow
Determine the number of slots
The RRA covers entirely the zone 5m

12. RRA rules Create a layout of the ducts Register on last section
HOW NAD - RRA duct diffuser
Create a layout of the ducts
Reducer or damper
Determine the Ø
Determine the airflow
Determine the number of slots
RRA rules
Register on last section
Reducer or damper every 25 ft : every 5 active sections
Register
Reducer
Damper

13. Diameter selection Create a layout of the ducts Reducer or damper
HOW NAD - RRA duct diffuser
Diameter selection
Create a layout of the ducts
Reducer or damper
Determine the Ø
Determine the airflow
Determine the number of slots
Donner Ductolator

14. Selection of Diameter Zone 1 : composed of 2 sections section n° 1 :
HOW NAD - RRA duct diffuser
Selection of Diameter
Create a layout of the ducts
Reducer or damper
Determine the Ø
Determine the airflow
Determine the number of slots
Zone 1 : composed of 2 sections
section n° 1 :
- 4 x Ø 556 mm
section n° 2 :
- 4 x Ø 403 mm
Zone 2 : composed of 1 section
- 4 x Ø 353 mm

15. Create a layout of the ducts Reducer or damper Determine the Ø
HOW NAD - RRA duct diffuser
Create a layout of the ducts
Reducer or damper
Determine the Ø
Determine the air flow per meter of slots
Determine the number of slots

16. An active duct typically has 1300 mm long slots
HOW NAD - RRA duct diffuser
An active duct typically has mm long slots
Create a layout of the ducts
Reducer or damper
Determine the Ø
Determine the airflow per meter of slots
Determine the number of slots

17. Create a layout of the ducts Reducer or damper Determine the Ø
HOW NAD - RRA duct diffuser
Create a layout of the ducts
Reducer or damper
Determine the Ø
Determine the air flow per meter of slots
Determine the number of slots
Clique sur image pour agrandir

18. Codification of RRA on plans
HOW NAD - RRA duct diffuser
Codification of RRA on plans
Airflow
TAG DIFFUSER
RRA-A
101 l/s 2
DFR
Start of NAD
section
Nb of slots
Air pattern
RRA-A
101 l/s 2
DFR
RRA-A
101 l/s 2
DFR 2
Cliquer sur image pour agrandir 3 3 3 3 2 2 2
When a duct passes a partition (or a wall), don’t forget to use a collar
Example of collar

19. NAD Technical Spec Chart
HOW NAD - RRA duct diffuser
NAD Technical Spec Chart
Tableau NAD Specifications RRA
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
RRA-A
NAD Klima
RRA
1, 2, 3,4,5,6,7
RRA-B
RRA-C
1, 2, 3,4,5,6, 7
RRA-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 , as well the colour of the rollers from our standard colors (withe, black, creme).
3 – Air pattern adjusted and balanced in factory according to plan
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

20. Horizontal distance travelled by the air jet
HOW NAD - RRA duct diffuser
Simulation graphics
Number of slots
Air jet velocity
Airflow rate per of slots
Vertical distance travelled by the air jet before reaching the selected air speed
Horizontal distance travelled by the air jet
Vertical penetration of air jet
Temperature differential in cooling

21. Codification HOW NAD - RRA duct diffuser
Cliquer sur image pour aggrandir

22. Specifications Available online In word format www.nadklima.com
HOW NAD - RRA duct diffuser
Specifications
Available online
In word format