EXTERNAL WEATHER LOUVRES - Scottaire pdfs/weather/A4 Weather... · · 2015-07-29EXTERNAL WEATHER LOUVRES EW1 A basic weather louvre is usually mounted in the vertical and has a

EXTERNAL WEATHERLOUVRES

EW1

A basic weather louvre is usually mounted in the verticaland has a row of horizontal blades shaped and positionedso as to minimise the ingress of water. Ideal for use on the external walls of a building at air intakes or discharges. Thefree area of a conventional louvre is about 50%. However,the blade pitch can be opened up to give up to 65% free area but the weather keeping properties decrease considerably and this would only be recommended wherethe louvre is protected from driving rain by an adjacentstructure.

Louvres can be square or rectangular, triangular, circular, infact, almost any shape. They can have doors in them, bemade demountable for service access or built up into penthouse units on screens.

There are several less conventional louvres which aredesigned to:a) be mounted in a roof pitch (angled louvre).

50mm & 70mm pitchb) to minimise sand intake (sand trap louvre).c) to be used in more exposed locations

(double bank chevron louvre).d) reduce contamination between intake and discharge

where one louvre is required to handle both supply and extract air (split louvre). 50mm & 70mm pitch

STANDARD •38MM PITCH.Code 0114. Square or rectangular, flanged louvre with birdmesh for surface mounting in the vertical.Code 0115. Square or rectangular louvre without flangeand with bird mesh for recessed mounting in the vertical. Code 0214. Square or rectangular louvre with bird meshand with a reversed flange for surface mounting in the vertical. Code 0216. Similar to a Code 0114 but with a 50mm wide flange.

50MM PITCH.Code 0280. Square or rectangular, flanged louvre with birdmesh for surface mounting in the vertical.Code 0281. Square or rectangular louvre, without flangewith bird mesh for recessed mounting in the vertical.Code 0286. Circular flanged louvre with bird mesh for surface mounting in the vertical.Code 0287. Circular louvre without flange with bird meshfor recessed mounting in the vertical.Code 0292. Triangular flanged louvre with bird mesh forsurface mounting in the vertical.Code 0293. Triangular louvre without flange with birdmesh for recessed mounting in the vertical.Code 0298. Square or rectangular penthouse louvre withbird mesh for curb mounting.

Code 0211. Square or rectangular flanged split louvre forsurface mounting with top section for upward and lowersection for downward discharge.Code 0208. Square or rectangular split louvre withoutflange for recessed mounting with top section for upwardand lower section for downward discharge.

75MM PITCH.Code 0282. Square or rectangular, flanged louvre with birdmesh for surface mounting in the vertical.Code 0283. Square or rectangular louvre, without flangewith bird mesh for recessed mounting in the vertical.Code 0288. Circular flanged louvre with bird mesh forsurface mounting in the vertical.Code 0289. Circular louvre without flange with bird meshfor recessed mounting in the vertical.Code 0294. Triangular flanged louvre with bird mesh forsurface mounting in the vertical.Code 0295. Triangular louvre without flange with birdmesh for recessed mounting in the vertical.Code 0609. Square or rectangular penthouse louvre withbird mesh for curb mounting.Code 0209. Square or rectangular flanged split louvre forsurface mounting with top section for upward and lowersection for downward discharge.Code 0213. Square or rectangular split louvre withoutflange for recessed mounting with top section for upwardand lower section for downward discharge.

LOUVRES-External Weather

EW2

STANDARD •con’t100MM PITCH.Code 0284. Square or rectangular, flanged louvre with birdmesh for surface mounting in the vertical.Code 0285. Square or rectangular louvre, without flangewith bird mesh for recessed mounting in the vertical.Code 0290. Circular flanged louvre with bird mesh forsurface mounting in the vertical.Code 0291. Circular louvre without flange with bird meshfor recessed mounting in the vertical.Code 0296. Triangular flanged louvre with bird mesh forsurface mounting in the vertical.Code 0297. Triangular louvre without flange with birdmesh for recessed mounting in the vertical.Code 0610. Square or rectangular penthouse louvre with

bird mesh for curb mounting.

Sandtrap.Code 0680. Square or rectangular sandtrap louvre flangedfor surface mounting.Code 0681. Square or rectangular sandtrap louvre withoutflange for recessed mounting.

AngledCode 0682. Square or rectangular flanged louvre with birdmesh for surface mounting in a angled roof up to 40degrees from the vertical.Code 0683. Square or rectangular louvre without flangewith bird mesh for recessed mounting in an angled roof upto 40 degrees from the vertical.

STANDARD SPECIFICATION

SIZES38MM PITCH.Any nominal length or height up to 1500mm providedthe other dimension does not exceed 1200mm.

50MM PITCH.Any nominal length or height in one piece, providedthe face area does not exceed 4 sq metres. However,any nominal length or height can be made up fromsections bolted together and, where necessary, supported on a metal framework. The maximum diameter for a circular louvre is 2000mm in one section. A larger diameter can be manufactured in multiple sections and bolted together.

75MM PITCH.Any nominal length or height in one piece, providedthe face area does not exceed 4 sq metres. However,any nominal length or height can be made up fromsections bolted together and, where necessary, supported on a metal framework. The maximum diameter for a circular louvre is 2000mm in one section. A larger diameter can be manufactured in multiple sections and bolted together.

100MM PITCH.Any nominal length or height in one piece providedthe face area does not exceed 4 sq metres. However,any nominal length or height can be made up fromsections bolted together and, where necessary, supported on a metal framework. The maximum diameter for a circular louvre is 2000mm in one section. A larger diameter can be manufactured in multiple sections and bolted together.

SANDTRAPAny nominal length or height in one piece providedthe face area does not exceed 4 sq metres. Larger sizescan be made up but they become very heavy to handle.Please contact the factory for details.

ANGLEDAny nominal length or height in one piece providedthe face area does not exceed 4 sq metres. Larger sizescan be made up but they become very heavy to handle.Please contact Head Office for details.

CONSTRUCTIONManufactured from aluminium extrusions with mitredcorners The 38mm pitch louvres have cleated corners.All others have welded corners. The bird mesh is manufactured from steel wire withwelded joints and 25mm cells.

FINISHES Louvres are mill finish aluminium. The bird mesh isgalvanised after manufacture.

FIXINGSSurface mounted louvres are fixed through the faceflange. Screw holes are not provided as the centresrequired vary considerably. Fixing type 0F2. Recessedlouvres are fixed through the stack. Screw holes are notprovided. Fixing Type 0F2.

PACKAGINGLouvres are packed in polythene and then sandwiched between two pieces of hard board andbanded with protective cardboard corners and sides.

TECHNICAL INFORMATIONSee pages 8 - 10


EW3

• The code for the basic grille should have 13 digits. See page 1.

• Please always give length first, then height.• Add codes for additions/alternatives as suffixes.

EXAMPLE:Example. A 50mm pitch flanged triangular louvrewith a nominal base dimension of 1500mm and anominal base to apex height of 1000mm with ahinged access door in it for surface mounting withpre-drilled fixing holes would be coded:-0292/01500/1000+0279+0F1.

Applications. Supply * Extract * Sidewall *

ORDERING DETAILS

FINISHES Any BS, RAL or NCS colour. 38 mm pitch, Code0145. Other pitches, Code 0146. please specify thecolour reference.Satin anodised. Code 0147 satin. It may be possible toanodise to other colours and finishes depending onquantity. Please contact the Head Office for details.

FIXINGSThe flanges can be pre-drilled. Please provide details offixing centres and whether or not countersinking isrequired. Fixing type OF1. Fixing tabs can be providedto the rear of the stack to fix to brick or steel work.Please provide details of your requirements. Fixingtype OF 11.

DRIP SILLSA drip sill can be provided, in the same finish as thelouvre. Details of the codes and dimensions are givenbelow.

SUPPORTING FRAMEWORKThe necessary supporting framework in steel or aluminium can be supplied to support multiple sections, where necessary, or to provide a louvredscreen. Please provide details.

DOORSSingle or double doors can be provided in all louvresand penthouses except for the 38mm pitch range. The doors are hinged and fitted with Eurolocks. Code 0279. Please provide details.

DE-MOUNTABLE PANELS, HINGED OR CUTAWAY SECTIONSThese can be provided to your requirements. Pleaseprovide details. The louvre product Code prefixbecomes 9 instead of 0.

OPTIONAL ALTERNATIVES/ADDITIONS


Code 0605 38mm PitchCode 0606 50mm PitchCode 0607 75mm PitchCode 0608 100mm Pitch

Drip Sillto suitFlangedExternalWeatherLouvre

Drip Sillto suitRecessedExternalWeatherLouvre

Code 0601 38mm PitchCode 0602 50mm PitchCode 0603 75mm PitchCode 0604 100mm Pitch

10

50mm

2

45°

10

50mm

2

45°

D = Nominal Duct sizeModel shown is Code 0114, 38mm pitchSmall External Weather Louvre with Bird MeshIf no Bird Mesh is fitted, Code becomes 0112 D - 5mmD + 52.4mm D

2.5

2.5

35

26.2

37.5

37.5Typ.

EW4


D = Nominal Duct sizeModel shown is Code 021150mm Reversed Flange External Weather Louvre with Bird MeshIf no Bird Mesh is fitted, Code becomes 0210

D = Nominal Duct sizeModel shown is Code 0214Reversed Flange External Weather Louvre with Bird MeshIf no Bird Mesh is fitted, Code becomes 0212

D = Nominal Duct dizeModel dhown is Code 021650mm Flanged Small External Weather Louvre with Bird MeshIf no Bird Mesh is fitted, Code becomes 0215

D = Nominal Duct sizeModel shown is Code 0115Recessed Frame Small External Weather Louvre with Bird MeshIf no Bird Mesh is fitted, Code becomes 0113

2.5

2.5

D - 5mm D

2.5

2.5

39

37.5

37.5Typ.

D + 92.6mmD - 5mm

D

5.037

50

37.5

37.5Typ.

D - 5mmD + 92.6mm D

37

37.5

50

37.5Typ.

D + 51mmD

2

37

30

37.5

37.5Typ.

5.0

D - 5mm

38mm PITCH (50mm FLANGE)

38mm PITCH (STANDARD)

EW5


Code 0280 Flanged Framefor surface mounting50mm pitch

Code 0281 Recessed Frame Code 0282 Flanged Framefor surface mounting75mm pitch

Code 0283 Recessed Frame

5

3

3

550

50

Code 0284 Flanged Framefor surface mounting100mm pitch

Code 0285 Recessed Frame

D + 84mm

100 Pitch

100

DNominal

DuctSize

D + 84mm

D + 84mm

50Pitch

DNominal

DuctSize

3

50

50Pitch

DNominal

DuctSize

3

75

75Pitch

DNominal

DuctSize

5

3

75

75Pitch

DNominal

DuctSize

5

100 Pitch

100

DNominal

DuctSize

50mm PITCH

100mm PITCH

75mm PITCH

EW6


Penthouse Louvre c/w Mitre CornersCode 0298 50mm PitchCode 0609 75mm PitchCode 0610 100mm PitchOther roof styles available upon request

Overall size A x B = Overcurb + 50mm

Standard Flange = 50mm

25mm Clearance

C/W Birdmesh

Code 0286 50mm Pitch surface mountCode 0287 50mm Pitch recessedCode 0288 75mm Pitch surface mountCode 0289 75mm Pitch recessedCode 0290 100mm Pitch surface mountCode 0291 100mm Pitch recessed

Code 0292 50mm Pitch surface mountCode 0293 50mm Pitch recessedCode 0294 75mm Pitch surface mountCode 0295 75mm Pitch recessedCode 0296 100mm Pitch surface mountCode 0297 100mm Pitch recessed

Height H

A B

Model shown is Code 0279Door available in 50, 75 &100mm pitchVarious door furniture can be fitted

EW7


Sand Trap Louvre Code 0636 with Flanged Frame

Mansard Type Angled Weather Louvre Code 0638 with Flanged Frame

100 x 25 Channel

100 x 25 Channel

Nominal WidthStack Width = Nominal - 10mm


50

25

5050

5

100

100

100

5050

5

100

100

5

Stac

kH

eigh

t=

Nom

inal

-10

mm

Nom

inal

Hei

ght

50

60°

100

5

Stac

kH

eigh

t =N

omin

al-

10m

m

Nom

inal

Hei

ght

Bird Guard

EW8


Mansard Type Angled Weather Louvre Code 0639 with Recessed Frame

100 x 25 Channel


Note: Particular care needs to be taken with sealing this type oflouvre to the building structure.

50

5

100

100

60°

100

5

Stac

kH

eigh

t =N

omin

al-

10m

m

Nom

inal

Hei

ght

Sand Trap Louvre Code 0637 with Recessed Frame

100 x 25 Channel


25

50

5

100

100

100

5

Stac

kH

eigh

t=

Nom

inal

-10

mm

Nom

inal

Hei

ght

Bird Guard

EW9


EXTERNAL WEATHER LOUVRES PERFORMANCE DATA 38mm PITCH• We would recommend that, on air intake, the ductvelocity does not exceed 1.5m/s (3.0m/s core velocity)at the louvre in order to minimise the ingress of water.This can be increased to 2.0m/s (4.0m/s core velocity)on extract applications provided the noise and pressuredrop criteria are met. Example. to select a louvre forair intake handling 0.3m3/s, place a rule on this point

on the volume line and ensure that it crosses the ductvelocity line @ 1.5m/s. Note where the rule the pivotline and then rotate the rule about this point to obtaina suitable combination of length and height. In thiscase a 450mm x 450mm. Read off the pressure dropand N.R., adding 10% to the pressure drop ifbirdmesh is fitted.

PERFORMANCE DATA

For core velocity, multiply duct velocity by 2 (i.e. 50% free area). Data based on intake air, for exhaust air add 20% to pressure drop and add 5 NR. For inclusion of Birdmesh add 10% to the pressure drop.

Volume (Q)m3/s

Nominal Louvre SizeWidth mm x Height mm

Pivot lineNominal Duct Area2 m

Pressuredrop ∆(Pt)

Pa

DuctVelocity

m/s

2.0

1.5

1.00.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.15

0.10.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

200

250

300

350

400

450

500

600

700

800

900

1000

1100

1200

1300

1400

1500

0.04

0.05

0.06

0.07

0.08

0.090.1

0.15

0.2

0.3

0.4

0.5

0.6

0.7

0.80.91.0

1.5

2

200

250

300

350

400

450

500

600

700

800

900

1000

1100

1200

1300

1400

1500

60

50

40

30

20

50

20

5

3

4.0

3.0

2.0

1.0

0.5

NRL

W

EW10


EXTERNAL WEATHER LOUVRES PERFORMANCE DATA 50mm PITCH

In this case a 450mm x 450mm. Read off the pressuredrop and N.R., adding 10% to the pressure drop ifbirdmesh is fitted. To calculate the size of a louvre tohandle more than 2.0m3/s divide the volume by anumber that gives a volume equal to less than 2m/sand use the Nomogram. It is reasonably safe to readthe pressure drop and NR from the nomogram anduse it for the larger louvre. Remember to multiply theresulting duct area shown on the pivot line by thesame number used to divide the volume. This will givethe face area of the required louvre.

PERFORMANCE DATA

For core velocity, multiply duct velocity by 2 (i.e. 50% free area). Data based on intake air, for exhaust air add 20% to pressure drop and add 5 NR. Graph includes the fitting of birdmesh.

Volume (Q)m3/s

Code 280 / 281 Nominal Louvre SizeWidth mm x Height mm



Pa

DuctVelocity

m/s

2.0

1.5

1.00.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.15

0.10.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

200

250

300

350

400

450

500

600

700

800

900

1000

1100

1200

1300

1400

1500

1600

1700

180019002000

0.04

0.05

0.06

0.07

0.08

0.090.1

0.15

0.2

0.3

0.4

0.5

0.6

0.7

0.80.91.0

1.5

2

3

4

200

250

300

350

400

450

500

600

700

800

900

1000

1100

1200

1300

1400

1500

1600

1700

180019002000

60

50

40

30

30

20

10

5

4.0

3.0

2.0

1.0

0.5

NRL

W

• We would recommend that, on air intake, the ductvelocity does not exceed 1.5m/s (3.0m/s core velocity)at the louvre in order to minimise the ingress of water.This can be increased to 2.0m/s (4.0m/s core velocity)on extract applications provided the noise and pressuredrop criteria are met. Example. To select a louvre forair intake handling 0.3m3/s, place a rule on this pointon the volume line and ensure that it crosses the ductvelocity line at 1.5m/s. Note where the rule crosses thepivot line and then rotate the rule about this point toobtain a suitable combination of length and height.

EW11


EXTERNAL WEATHER LOUVRES PERFORMANCE DATA 75mm PITCH• We would recommend that, on air intake, the ductvelocity does not exceed 1.5m/s (3.0m/s core velocity)at the louver in order to minimise the ingress of water.This can be increased to 2.0m/s (4.0m/s core velocity)on extract applications provided the noise and pressuredrop criteria are met. Example. To select a louvre forair intake handling 0.3m3/s, place a rule on this pointon the volume line and ensure that it crosses the ductvelocity line at 1.5m/s. Note where the rule crosses thepivot line and then rotate the rule about this point toobtain a suitable combination of length and height.

In this case a 450mm x 450mm. Read off the pressuredrop and N.R., adding 10% to the pressure drop ifbirdmesh is fitted. To calculate the size of a louvre tohandle more than 2.0m3/s divide the volume by anumber that gives a volume equal to less than 2m/sand use the Nomogram. It is reasonably safe to readthe pressure drop and NR from the nomogram anduse it for the larger louvre. Remember to multiply theresulting duct area shown on the pivot line by thesame number used to divide the volume. This will givethe face area of the required louvre.

PERFORMANCE DATA

For core velocity, multiply duct velocity by 2 (i.e. 50% free area). Data based on intake air, for exhaust air add 20% to pressure drop and add 5 NR. Graph includes the fitting of birdmesh.

Volume (Q)m3/s

Code 282 / 283 Nominal Louvre SizeWidth mm x Height mm



Pa

DuctVelocity

m/s

2.0

1.5

1.00.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.15

0.10.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

200

250

300

350

400

450

500

600

700

800

900

1000

1100

1200

1300

1400

1500

1600

1700

180019002000

0.04

0.05

0.06

0.07

0.08

0.090.1

0.15

0.2

0.3

0.4

0.5

0.6

0.7

0.80.91.0

1.5

2

3

4

200

250

300

350

400

450

500

600

700

800

900

1000

1100

1200

1300

1400

1500

1600

1700

180019002000

60

50

40

30

20

40

3020

10

5

4.0

3.0

2.0

1.0

0.5

NRL

W

Documents

EXTERNAL WEATHER LOUVRES - Scottaire pdfs/weather/A4 Weather... · · 2015-07-29EXTERNAL WEATHER LOUVRES EW1 A basic weather louvre is usually mounted in the vertical and has a