1 HOW NAD RRA duct diffuser HOW NAD

1 HOW NAD RRA duct diffuser HOW NAD - RRA duct diffuser

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

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

HOW NAD - RRA duct diffuser Blends with structure 4

HOW NAD - RRA duct diffuser Selection steps 1. 2. 3. 4. 5. Determine placement of ducts Reducer or damper Determine the Ø Determine airflow per meter of slots Determine the number of slots 5

HOW NAD - RRA duct diffuser Sample Calculation Zone 1 : 4160 m 3/h (2450 cfm) Zone 2 : 1232 m 3/h (725 cfm) Height of underside of duct : 4 m 6

HOW NAD - RRA duct diffuser Example of layout 1. 2. 3. 4. 5. Create a layout of the ducts Reducer or damper Determine the Ø Determine the airflow Determine the number of slots 7

HOW NAD - RRA duct diffuser 8 Recommendations for direct connection 1. 2. 3. 4. 5. Create a layout of the ducts Reducer or damper Determine the Ø Determine the airflow Determine the number of slots

HOW NAD - RRA duct diffuser 9 Recommendations for direct connection 1. 2. 3. 4. 5. Create a layout of the ducts Reducer or damper Determine the Ø Determine the airflow Determine the number of slots

HOW NAD - RRA duct diffuser 1. 2. 3. 4. 5. 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 The supply duct exceed the wall an exact length of 2’’ 1/4 (58 mm)

11 HOW NAD - RRA duct diffuser Optimal layout 1. 2. 3. 4. 5. 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 5 m

12 HOW NAD - RRA duct diffuser RRA rules Register on last section Reducer or damper every 25 ft : every 5 active sections 1. 2. 3. 4. 5. Create a layout of the ducts Reducer or damper Determine the Ø Determine the airflow Determine the number of slots Register Reducer Damper

HOW NAD - RRA duct diffuser Diameter selection 1. 2. 3. 4. 5. Create a layout of the ducts Reducer or damper Determine the Ø Determine the airflow Determine the number of slots • 13

HOW NAD - RRA duct diffuser Selection of Diameter 1. 2. 3. 4. 5. 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 14

HOW NAD - RRA duct diffuser 1. 2. 3. 4. 5. 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 15

HOW NAD - RRA duct diffuser An active duct typically has 1300 mm long slots 1. 2. 3. 4. 5. Create a layout of the ducts Reducer or damper Determine the Ø Determine the airflow per meter of slots Determine the number of slots 16

17 HOW NAD - RRA duct diffuser 1. 2. 3. 4. 5. 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

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

19 HOW NAD - RRA duct diffuser NAD Technical Spec Chart NAD Klima RRA-D NAD Klima RRA Tempin duct in summer RRA-C Room R. H. % In summer RRA Room Temp In summer NAD Klima Temp. in duct in winter RRA-B Room R. H. % in winter RRA Room Temp in winter NAD Klima Height below the duct RRA-A Ceiling height Brand Airflow Identification Model Tableau NAD Specifications RRA Notes 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

HOW NAD - RRA duct diffuser 20 Simulation graphics Number of slots Airflow rate per of slots Air jet velocity 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

HOW NAD - RRA duct diffuser Codification 21

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