Theres an even bigger picture to be found at Ruskin Air Management.
Air ManagementRuskin
February 2016
External Metal Louvres
naco
Storm Louvres
Standard Louvres
Penthouse Louvres
Doors
Screens
Slimtype
naco
External Metal Louvres
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Our ideas built with you in mind
Learning to harnessnatures elements
When someone says it cant be done, theyveobviously not spoken to us. So if anyone inthe industry suggests that you are asking forthe impossible, it will always be our privilegeto prove them wrong yet again.
From start to finish
Because unlike most UK louvre companies, we design,detail, supply and install. So not only do our productsmatch your requirements precisely in terms of function butalso in style, finish and colour.This determination to see things through to the finishedresult gives architects and designers a unique opportunityto create outstanding ventilation features or screeningcontrols within the external cladding. And our can-doattitude makes those satisfied clients come back to ustime and time again.
Past, present and future
Since the early sixties this customer-first philosophy hasbeen enshrined in all our activities. Blended withmanufacturing experience and practical expertise honedover almost half a century, it has seen Naco defineeverything from metal and glass louvres, natural air andsmoke ventilators to mist separators, sunscreens andbrise soleil.
An ideal environment
But user friendliness isnt the only challenge facing buildingdesign today. Increasingly environmental friendliness is nowa design pre-condition, reflecting a growing duty to protectthe natural environment whilst controlling our own internalenvironments.
Learning to harness natures elements to our advantagerather than simply fighting against them is now drivingforward our engineering and design teams more than ever.
External Metal Louvres
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Page
Louvre Selection Guide Page 4
Performance Data Page 5
Pressure Loss / Sizing Data Page 6
Slimtype Aluminium Louvre Page 7
50 Standard Series Page 8
75 Standard Series Page 9
Storm Louvres Page 10
Storm Louvre Vertical Blade - SLV-S Page 11
Storm Louvre Horizontal Blade SLH-S Page 12
Storm Louvre Horizontal Blade DB50 Page 13
Wind Driven Rain Performance DB50 Page 14
Installation Drawings DB50 Page 15
Typical Installation Details DB50 page 16
Louvred Doors and Access Panels Page 17
Louvred Doors Page 18
PH Series Penthouse Louvres Page 19 - 21
Project Photographs Page 22
General Coupling Details Page 23
Typical Fixing Arrangements Page 24
Product Range Page 25
Survey and Installation Service Page 26
The Naco Range Page 27
Contents
naco
Type
Louvre Selection Guide
External Metal Louvres
4
Use
Standard (non drainable)louvres. Horizontal blade
Use in sheltered areas andwhere water entry will notdamage the building fabric.Also used for screen walling(with blanking plates fitted) andplantroom screens.
SLH-S Storm louvreHorizontal blade
A superior design providing avery high level of waterprotection unmatched byother single bank systems.
DB50 Storm louvreHorizontal blade
A single bank louvre offeringextremely high performancewith only a 51mm deepprofile.
SLV-S Storm louvres Vertical blade sight proof
Top of the range performancelouvres for use where dryroom conditions are required.Unmatched by anycompetitive design, offeringsuperb aerodynamic andwater rejection properties.
Slimtype A simple glaze in louvre,suitable for use in shelteredsituations.
Performance Data
Weather louvres areclassified by their ability toreject simulated rain.
Classifications are as follows:-
The water effectiveness isdenoted by:
Class EffectivenessA 1 to 0.99B 0.989 to 0.95C 0.949 to 0.80D below 0.8
ie. 0.99 effectiveness 99%water repellent efficiency.
The aerodynamiceffectiveness is:
Class Discharge / entry Loss coefficient1 0.4 and above2 0.3 to 0.3993 0.2 to 0.2994 0.199 and below
The water penetration classletter should precede thecoefficient of discharge classletter followed by the limitingcore velocity, eg.
A1 up to 3.5 m/s.
The following graph details louvre efficiency comparisons(water rejection) for our storm louvres
Test Classification
Water Cd CoreClass Class Velocity
SLV-SA 1 Up to 3.5 m/s
Classification from design tests carried out by BSRIA to the HEVAC technical specificationnow developed and published as BS EN ISO 13030.
Materials and finishesAll louvres within the Nacorange are normallymanufactured from aluminiumextrusions. Flashings whererequired will be formed frompressed aluminium sheet.
Powder coatedLouvre assemblies andflashings can be powdercoated matt polyester to BSand RAL colours.
AnodisingLouvres and flashings may benatural or colour anodisedwithin commercial colourtolerances which will beagreed for each project.
Mill finishLouvres and flashings maybe supplied in mill finish andwhile the integrity of thematerial is unaffected, thevisual appearance will beimpaired due to the naturaloxidisation process which willoccur on mill finish aluminium,therefore painting isrecommended to enhance thefinished product.
General constructionLouvres are produced infactory assembled panels forcoupling into final assemblieson site. The normal maximumpanel size is approximately1.5m x 2.5m and horizontal orvertical louvre assemblies willnormally be supplied withinthese limitations. Largershaped or circular louvreassemblies will bemanufactured in panel sizes.SLV and SLH panels areproduced in 2m2 units forcoupling on site. Larger louvreassemblies may requireintermediate steel supportrails which would normally beprovided by the generalcontractor in consultation withour design office.
VENTILATION RATE M/S
TYPICAL ZLOUVRE
SLH-S
DB50
SLV-S
EFF
ICIE
NC
Y %
0 0.25 0.5
100
95
90
85
800.75 1.0 1.25 1.5 1.75 2.0 2.25 2.5 3.0 3.25 3.5 3.75
Water Cd CoreClass Class Velocity
SLH-SB 2 Up to 1.5 m/sC 2 1.5 to 2.9 m/s
Standard series 50/75C 3 Up to 1.5 m/s
External Metal Louvres
5naco
ExampleSize a 75 series louvre withbird wire guard which iscapable of handling 15m3/s inintake mode with a pressuredrop of not more than 25Pa.
1.From velocity formula:
V = Pa x Cd 2
1/2 p
V = 25 x 0.2292
0.6
Velocity for a pressure drop of25 Pa is 1.47 m/s.
2. Volume
= AreaFace Velocity
15 = 10.2m2
1.47
Therefore a louvre area of10.2m2 is required:
Penthouse louvres should besized as 4 panels of equalheight which, when addedtogether, will give the requiredfigure.
Free area = Duct volume m3/sm2 Duct velocity m/s
Louvre area = Louvre free m2 area m2
louvre free area%
Example:
75 series louvre(50% free area)Duct volume 15 m3/sDuct velocity 3.12 m/s
Free area m2 = 15 = 4.81m2
3.12
Therefore:
louvre area = 4.81 = 9.62m2
m2 0.5
Pressure lossPressure loss occurs when alouvre is inserted into anopening and may be foundfrom:
Pa = 1/2 p x V2 2
Cd
p = Air density (1.2 Kg/m3 )V = Face velocity i.e.:
Volume (m3/s) Louvre core area (m2)or V = Pa x Cd 2 1/2 p
Cd is louvre coefficient ofdischarge.
Cd and Ce figures can, for allpractical purposes, be takenas the same.
Slimtype 0.189
50 standard 0.224
50S - 65% 0.328
75 standard 0.229
75S - 65% 0.335
SLV-S 0.409
SLH-S 0.345
DB50 0.39
Free areaThis is the minimummeasured area of eachopening through which aircan pass.
Pressure loss
Face velocity m/s 1.50 1.75 2.00 2.25 2.50 2.75 3.00
Pa - 50 standard series 26 36 48 60 75 90 108
Pa - 50S - 65% 13 17 22 28 35 42 50
Pa - 75 standard series 26 35 48 60 72 87 103
Pa - 75S - 65% 13 17 22 28 35 42 50
Pa - SLH-S 13 17 22 29 34 41 49
Pa - SLV-S 9
