tek intonat®-acoustic louvres


Noisy equipment can be surrounded with acoustic louvres which attenuate the noise from equipment and allow ventilation for cooling and fresh air.

The louvres have aerofoil section blades to reduce pressure drop.

The acoustic and pressure performance of the louvres have been tested by Sound Research Laboratories Ltd (SRL).

Enhanced acoustic performance can be achieved using our Acoustic Panels.

The panels, typically, have an outer layer of plastic-coated steel with semi rigid rockwool retained behind perforated galvanised steel.

The panels can be used as sound barriers, enclosures or wall lining and can be supplied with acoustic doors.

The panels have been fire tested by Warrington Fire and acoustically tested by SRL Ltd.


Acoustic Louvre Type - ACL1/ACL2 Non-Acoustic Louvre Type - ACLN:

With the increasing need for quieter air conditioning systems Tek manufacture acoustic louvres to meet the architects requirement of aesthetically pleasing looks while meeting the building services requirements for airflow and noise reduction. The louvres have been tested by Sound Research Laboratories Ltd to BS2750.

Because all louvres are designed and manufactured in-house by engineers with many years experience we are not restricted to standard sizes. This means each louvre is tailor made to meet your opening dimensions.

We offer acomprehensive service with our acoustic design which ensures you receive the best possible advice at planning stage, thereby avoiding site problems later on. On large louvre assemblies/screens our engineers work in close liaison with you from quotation and design to order stage through manufacture to delivery and if required, organise our own experienced fitters for the installation of the louvres.

Acoustic Louvre Dimensions - Type ACL1/ACL2/ACLN:

Single Acoustic Louvre Type ACL1

Construction:
The standard acoustic louvre is 300mm deep manufactured from 1mm thick galvanised mild steel up to amaximum size of 2400mm x 2400mm. Larger sizes are available made up in modules. Bird guard mesh is fitted as standard.

Fixing:
The louvres are supplied undrilled and are normally fixed through the sides by others. (Refer to fixing methods for other suggestions.)

Double Acoustic Louvre Type ACL2

Construction:
The standard double banked louvre is two single units back to back making the louvre 610mm deep manufactured from 1mm thick galvanised mild steel up to amaximum size of 2400mm x 2400mm. Larger sizes are available made up in modules. Bird guard mesh is fitted as standard.

Fixing:
As the single Acoustic Louvre.

Non-Acoustic Louvre Type ACLN

Construction:
The non acoustic louvre is normally used to match the appearance of the acoustic louvre. It is 150mm thick galvanised mild steel up to amaximum size of 2400mm x 2400mm. Larger sizes are available made up in modules.

Fixing:
As the single acoustic louvre

Product Specification - Acoustic Louvres:

Construction - Frame & Blades:
The frame and blades are manufactured from 1mm thick galvanised mild steel or aluminium. Each blade in the airstream has an acoustic infill covered by 0.7mm thick perforated or expanded galvanised steel sheet. The blades are positioned on a150mm pitch.

Acoustic Infill:
The infill is inorganic mineral wool or glass fibre rigid slabs with a glass fibre tissue face to limit fibre erosion. The fibre is inert, vermin, rot and moisture proof, non-combustable, non-supportive of bacteriological growth and packed to adensity of not less than 45kg/m3. The infill has been tested for fire and has a Class 1 spread of flame. (As measured to BS476: Part 7: 1971)

Sizes:
There are no standard sizes for the acoustic louvres as each louvre is tailormade to meet your requirements. When specifying the size, we require the actual opening dimensions as we allow atolerance to ensure the louvre fits into the opening.

Acoustic Performance:
The louvres have been tested in accordance with BS2750:1980 by an independent consultant.

Aerodynamic Performance:
The louvres have been tested in accordance with BS2750 by an independent consultant. See pressure loss charts.

Finishes:
As standard the louvres are supplied in galvanised mild steel finish but can be supplied with a polyester powder finish to BS4800 or RAL colours or a BSC Plastisol HP200 Finish.

Transmission Loss 63 125 250 500 1k 2k 4k 8k H2
Single Bank 05 06 07 12 18 21 16 15 dB
Double Bank 07 09 11 20 32 35 31 31 dB

Non-Acoustic Louvres:

Construction - Frame & Blades:
The frame and blades are manufactured from 1mm thick galvanised mild steel or aluminium. The blades are positioned on a150mm pitch.

Sizes:
As acoustic louvres.

Acoustic Louvred Doors:

Doors can be supplied single or double leaf 300mm deep. Hinges are heavy duty and run the full height of the door. Handles and locks are to the customers specification. Prices on application. Units are complete with bird guard mesh as standard.

If non-active we would suggest that anon-active louvre is used as the appearance is the same but is only 150mm deep.

Finish:
Galvanised mild steel but polyester powder finish to BS4800 or RAL colours or plastic coated plastisol HP200 steel.

Non-Acoustic Louvres:

Construction - Frame & Blades:
The frame and blades are manufactured from 1mm thick galvanised mild steel or aluminium. The blades are positioned on a150mm pitch.

Sizes:
As acoustic louvres.

Single & Double Banked Multiple Section Louvre & Penthouse - Acoustic Louvre:

Specification:
For louvre sizes 2400 x 2400 these are supplied as multi-section. For strengthening, the units are supplied with framework as shown.

Fixing:
The support framework is first fitted to the structural opening, the louvre units are then secured by fixing into the framework.

Installation:
If required we have our own team of experienced fitters who can install large louvre units. Should you require this facility then please contact the head office for details.

Specification:
The penthouse louvre is made up of single louvre units, with the corner being fixed together by angle brackets and covered with a corner flashing.

Fixing:
The penthouse is supplied in sections and bolted together using M6 bolts. The base is then secured to the kerb by fixing through the base of the louvre.

Installation:
When specifying your requirements please state the over kerb size. The penthouse is manufacturerd so that there is a20mm overhang all the way round.

Acoustic Louvre - Pressure Drop Chart & Calculations:

Velocity shown on the pressure drop chart are based on anett areai.e. the 350mm non active section is taken off the height.

Please note the pressure drop chart can only be used on the maximum louvre height of 2400mm. Above this height deduct 350mm from the opening height for each height multiple of 2400mm. This is also applicable to any multi section acoustic louvre split in the height- deduct 350mm for each section.

Example:
Volume = 1.575 m/s
Louvre + 1000 Wide x 800mm High
Nett Area = (Opening Height - 350mm) x Opening Width
Nett Area = (0.8m - 0.35m = 0.45 High) x 1.0m Wide
Nett Area= 0.45m2

Net AreaVelocity = Volume = 1.575m3/s = 3.5m/s
Nett Area0.45m2

Plotting the velocity across to the Single Bank Louvre line indicates a pressure drop of 50 Pa.

Acoustic Louvre Fixing Methods:

Optional Angled Frame Typical Installation
The angle frame is supplied loose for fitting on site. However if required it can be fitted at the factory providing the position of the frame is specified.

Louvre Codings & Weight Chart:

Weight Chart
Weights are for single section galvanised steel single acoustic louvres type ACL1. All weights are in kilogrammes.

Weight Chart
  450 600 750 900 1050 1200 1350 1500 1650 1800 1950 2100 2250 2400
450 13 16 20 23 26 29 32 35 38 40 44 48 51 53
600 16 22 28 32 36 43 46 52 57 55 59 64 68 73
750 20 28 36 41 48 52 58 65 69 69 75 80 86 92
900 26 34 42 50 56 60 65 72 78 82 89 96 103 110
1050 30 39 48 56 62 69 78 85 89 96 104 112 120 128
1200 35 43 52 60 69 78 86 94 101 109 119 128 138 145
1350 39 50 54 66 74 80 92 98 106 123 134 144 154 165
1500 44 55 59 72 86 92 105 111 123 138 149 161 172 184
1650 48 59 66 75 93 106 112 124 144 151 164 176 189 201
1800 52 64 78 89 102 114 126 138 152 164 179 192 207 216
1950 56 68 80 94 111 118 131 147 169 179 194 208 224 239
2100 60 75 86 98 119 129 143 156 176 192 209 224 240 257
2250 64 80 92 106 124 144 152 172 182 206 223 240 258 275
2400 68 85 104 118 136 153 167 184 198 216 239 257 275 282

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