Lindab OLC Overflow Unit Instruction Manual

: June 4, 2024
: Lindab

Lindab OLC Overflow Unit Instruction Manual

Description

OLC is a circular overflow unit for installation directly into a wall. OLC consists of two sound-attenuating baffles, which are mounted on both sides of the wall.

Discrete design
Sound-attenuating baffles

Maintenance

The sound attenuation baffles on both sides of the wall can be removed to enable cleaning of internal parts.
The visible parts of the unit can be wiped with a damp cloth.

Dimensions

OLC Size (Ød)| ØD

[mm]

| *ØU| m

[kg]

---|---|---|---
100| 200| 108-110| 0.8
125| 250| 133-135| 1.0
160| 300| 168-170| 1.2

ØU = Cutout dimension in wall = Ød + 10 mm

Quick selection

OLC Size

Ød

| p t = 10 [Pa]

[l/s] [m 3/h]

| p t = 15 [Pa]

[l/s] [m 3/h]

| p t = 20 [Pa]

[l/s] [m 3/h]

| *D n,e,w [dB]
---|---|---|---|---
100| 19| 68| 24| 86| 27| 97| 49
125| 28| 101| 34| 122| 39| 140| 47
160| 40| 144| 49| 176| 56| 202| 44

Values valid for cavity wall with 95 mm insulation.

Materials and finish

Installation bracket: Galvanised steel Front plate: Galvanised steel
Standard finish: Powder-coated
Standard colour: RAL 9010 or 9003, Gloss 30

The OLC is available in other colours. Please contact Lindab’s sales department for further information.

Overflow unit

Accessories

OLCZ – Perforated wall sleeve

Order code

OLC installed in wall

OLC with OLCZ installed in wall

OLCZ optional accessory.

For further information, see OLC installation instruction.

Overflow unit OLC

Technical data

Capacity

Air flow rate qv [l/s] and [m3/h], total pressure loss Δpt [Pa] and sound power level LWA [dB(A)] are specified for a OLC unit on both sides of the wall.

Dimensioning diagram

Element-normalised reduction figure Dn,e

Weighted value (Dn,e,w) evaluated according to ISO 717-1

Cavity wall with 95 mm insulation

Size

[mm]

| ****

125

| Centre frequency [Hz]

250 500 1K 2K

| ****

*D n,e,w

---|---|---|---
100| 32| 46| 46| 48| 54| 49
125| 34| 43| 43| 46| 51| 47
160| 34| 40| 40| 44| 50| 44

Cavity wall with 70 mm insulation

Size

[mm]

| ****

125

| Centre frequency [Hz]

250 500 1K 2K

| ****

*D n,e,w

---|---|---|---
100| 30| 40| 38| 42| 50| 43
125| 30| 37| 37| 42| 49| 43
160| 30| 34| 34| 40| 50| 41

Solid wall without insulation

Size

[mm]

| ****

125

| Centre frequency [Hz]

250 500 1K 2K

| ****

*D n,e,w

---|---|---|---
100| 24| 24| 23| 32| 40| 31
125| 23| 24| 23| 33| 40| 31
160| 24| 24| 23| 32| 39| 30

Technical data Sample calculation

When dimensioning an overflow diffuser, calculate the decrease in the wall’s noise-reducing properties.
For these calculations, the area of the wall and sound reduc- tion figure R must be known.
This is adjusted in relation to the unit’s Dn,e value. Dn,e is the unit’s R value given at a transmission area of 10 m2, as speci- fied in ISO 140-10.
The D n,e value can be converted into the R value for other transmission areas using the table below.

A rea [m 2 ]	10	2	1
C orrection [dB]	0	-7	-10

The diagram below indicates the decrease of the sound reduc- tion index of the wall, for a given octave band value (D ) or weighted value ( Dn,e,w ).
As a rough estimate the calculation can be performed directly using the wall´s Rw value and the weighted elementnormalized level difference Dn,e,w of the unit.

Example:

(See diagram below) :

Rw (wall): 50 dB
Dn,e,w (diffuser): 44 dB Rw- Dn,e,w = 6 dB Area of wall: 20 m2
Number of Units: 1 20 m2/1 = 20 m2
Indicated reduction of Rw (wall): 5 dB
Rw value for wall with unit: ~50-5 = 45 dB
The calculation can also be performed using the following for- mula: