Lindab CRU Theatre Rectangular Displacement Diffuser Owner’s Manual
- June 10, 2024
- Lindab
Table of Contents
CRU Theatre Rectangular Displacement Diffuser
Theatre Diffuser
The CRU is a rectangular displacement diffuser designed to be installed under seats in theatres, auditoriums, and other similar settings. The diffuser is supplied with a circular connection and can be fitted with a fixed resistance adapted to the correct air volume and pressure according to the actual conditions.
Dimensions
| Size | A (mm) | B (mm) | B-20 (mm) |
|---|---|---|---|
| 4010 | 400 | 100 | 80 |
| 4015 | 400 | 150 | 100 |
| 5010 | 500 | 100 | 80 |
| 5015 | 500 | 150 | 125 |
Maintenance
The front plate can be removed for cleaning of the internal components. The visible parts of the diffuser can be wiped with a damp cloth.
Materials and Finish
The diffuser is made of 1 mm galvanized steel with a powder-coated finish in RAL 9010 or 9003, gloss 30. Other color options are available upon request.
Order Code
The product is identified by the order code CRU followed by the size (4010, 4015, 5010, or 5015). For example, CRU-4015.
Pressure and Sound Level
| Size | pt [Pa] | LWA dB(A) |
|---|---|---|
| 4010/5010 | 50 | 40 |
| 4015 | 30 | 150 |
Weight
| Size | Weight (kg) |
|---|---|
| 4010 | 1.40 |
| 4015 | 2.00 |
| 5010 | 1.70 |
| 5015 | 2.50 |
Airflow Data
| Size | qV [l/s] | Centre Frequency (Hz) |
|---|---|---|
| 4010 | 50 | 63, 125, 250, 500, 1K, 2K, 4K, 8K |
| 4015 | 30 | 63, 125, 250, 500, 1K, 2K, 4K, 8K |
| 5010 | 40 | 63, 125, 250, 500, 1K, 2K, 4K, 8K |
| 5015 | 60 | 63, 125, 250, 500, 1K, 2K, 4K, 8K |
Note: The speed is measured at a distance of 0.5m from the diffuser.
Product Usage Instructions
The CRU theatre diffuser should be installed under seats in theatres and auditoriums for effective air distribution. The diffuser can be customized to adapt to the correct air volume and pressure based on the actual conditions. Follow the below instructions for product usage:
- Remove the front plate of the diffuser to clean the internal components as needed.
- Wipe the visible parts of the diffuser with a damp cloth for maintenance.
- Ensure that the diffuser is installed according to the correct size and order code (e.g., CRU-4015).
- The diffuser can be supplied with a fixed resistance adapted to the correct air volume and pressure specified according to the actual conditions.
- Refer to the airflow data table to determine the appropriate qV [l/s] for your needs, as well as center frequency (Hz).
- Measure the speed of the diffuser at a distance of 0.5m, and ensure that it is within a safe range.
- Contact Lindab’s sales department for further information about other color options.
Description
CRU is a rectangular displacement diffuser for installation under seats in theatres, auditoriums, etc. The diffuser is supplied with a circular connection. The diffuser can be supplied with a fixed resistance adapted to the correct air volume and pressure, specified according to the actual conditions.
- Circular connection with Lindab Safe.
- The diffuser can be supplied with a fixed resistance at a specified pressure setting.
- The diffuser is available in other dimensions.
Maintenance
The front plate of the diffuser can be removed to enable cleaning of the
internal components. The visible parts of the diffuser can be wiped with a
damp cloth.
Materials and finish
- Diffuser: Galvanized steel
- Front plate: 1 mm galvanized steel
- Standard finish: Powder-coated
- Standard color: RAL 9010 or 9003, gloss 30
The diffuser is available in other colors. Please contact Lindab’s sales department for further information.
Order code
Dimension
Pressure, sound level 
Near zone 
The speed is measured 0.5 m from the diffuser.
Lindab reserves the right to make changes without prior notice 2021-11-05