Gravity Shutters

Technical Catalogue

Gravity Shutters

Gravity Shutters are designed to prevent backflow and to equalize the pressure across the system. Each gravity shutter is carefully designed to equalize the pressure in areas like compressor room, fan room or an exhaust system with that of the atmosphere aided by gravity. These devices are employed at the end of an exhaust duct where it opens up when the exhaust fan is turned ON, closes down when the fan is turned OFF. The frames and blades are extruded aluminium alloy. Blades are selected according to the type of application and the size of shutter. Assembled products are electrostatic polyester powder coated to any architectural finish.

Gravity Shutters

Ref:GD1000GS

EXCELAIR Air Outlets | Technical Catalogue

Gravity shutters are commonly employed in intake and exhaust applications in residential, com-mercial and industrial ventilating system. They are used in maintaining assured pressure in pressure prone dwellings, where the blades automatically open to discharge the excessive air. Gravity shutters are commonly known as pressure relief dampers and non return dampers.

Gravity Shutters | Introduction

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Construction & Application

Frames/Blades Extruded heavy Gauged Aluminium alloy profile.

Finish Electrostatic Polyester powder coated system/RAL code.

Fixing On wall / door / ducts.

Shape Square and Rectangular.

Gravity Shutters are meant for installation on the Side walls and duct mounting.

Specially applied for exhaust air purposes and are modeled with blades for pressure relief application.

While enhancing cosmetic appearance they provide effective protection against elements.

Gravity Shutters are mainly used to discharge the contaminated air and as pressure relief ventilators in HVAC system.

Rugged assembly provides long durability.

Extensively used in the central air conditioning, ventilation and industrial ventilation systems.

IntroductionGravity Shutters

EXCELAIR Air Outlets | Technical Catalogue Gravity Shutters | Assembling Features

2

Dimensional Details

Gravity shutters are generally used for air discharge in residential, commercial and industrial applications.

Gravity shutters are designed to inhibit air reverse. It performs by automatic opening of the hanging blades in the unit when the

air pressure is heavy. It closes shut automatically when the pressure is released, thus allowing airflow in only one direction. It is

commonly known as Pressure Relief Louvers.

Gravity shutter’s rugged, durable, heavy gauged extruded aluminum construction and careful fabrication assures effective weather

protection.

The 30mm wide frame flanges are separated from the movable aluminum blades by an extruded rigid aluminum track which is

rivetted and becomes a part of the frame.

The blades are carefully designed to tolerate moderate pressure drop even for all weather conditions and also designed to restrict

water penetration.

The overlapping lips of the blades pasted with foam tapes assures a tight grip when the blades are in pressure released position.

All the models can be provided with foam rubber gasket as an option to prevent air leakage and wall smudging behind the frames.

64m

m

45 m

m

30 mm

Wall Mounting [GS-WM]

List

ed s

ize

+50

mm

Nec

k si

ze =

Lis

ted

size

-10

mm

64m

m

70mm

Duct Mounting [GS-DM]

Duc

t si

ze -

10 m

m

Assembling FeaturesGravity Shutters

EXCELAIR Air Outlets | Technical Catalogue Gravity Shutters | Installation

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30m

m30

mm

Blade

AluminiumTrack

Wall Mounting [DG-WM]

Duct system1

Duct system2

Fan 2

Fan 1

Rivet

Duct Mounting [DG-DM]

Notes:

Fan 1 In Operation.

Fan 2 In Stand-by.

List

ed s

ize

+ 5

0 m

m

Nec

k si

ze =

Lis

ted

size

-10

mm

List

ed s

ize

Airfl

ow

InstallationGravity Shutters

EXCELAIR Air Outlets | Technical Catalogue Gravity Shutters | Performance Data

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Area Factor

Listed Height

(mm) (Inches)

Listed Width (mm/Inches)

300/12 350/14 400/16 450/18 500/20 600/24 750/30 900/36 1050/42 1200/48 1300/52 1500/60 1800/72

300 0.83 0.97 1.11 1.25 1.38 1.66 2.08 2.49 2.91 3.32 3.73 4.15 4.98

400 1.11 1.29 1.48 1.66 1.84 2.21 2.77 3.32 3.87 4.42 4.98 5.53 6.64

500 1.38 1.61 1.84 2.08 2.31 2.77 3.46 4.15 4.84 5.53 6.23 6.92 8.3

600 1.66 1.94 2.21 2.49 2.77 3.32 4.15 4.95 5.81 6.64 7.47 8.3 9.96

700 1.91 2.26 2.58 2.91 3.23 3.87 4.84 5.81 6.78 7.75 8.72 9.68 11.62

800 2.21 2.55 2.95 3.32 3.69 4.43 5.53 6.64 7.75 8.85 9.96 11.07 13.28

900 2.49 2.91 3.32 3.74 4.15 4.98 6.23 7.47 8.72 9.96 11.21 12.45 14.99

1000 2.77 3.23 3.69 4.15 4.61 5.53 6.91 8.3 9.68 11.06 12.45 13.83 16.60

1100 3.04 3.55 4.06 4.57 5.07 6.09 7.61 9.13 10.65 12.17 13.69 15.21 18.26

1200 3.32 3.87 4.42 4.95 5.53 6.64 8.3 9.96 11.62 13.28 14.94 16.6 19.92

1300 3.60 4.20 4.80 5.40 5.99 7.19 8.99 10.79 12.58 14.39 16.19 17.98 21.58

1400 3.87 4.52 5.16 5.81 6.45 7.75 9.68 11.62 13.56 15.49 17.43 19.36 23.24

1500

12

16

20

24

28

32

36

40

44

48

52

56

60 4.15 4.84 5.53 6.22 6.91 8.3 10.40 12.45 14.53 16.60 18.65 20.75 24.90

ft²Area Factor = 0.83 x (H) x (W)

144

CFM = Area Factor x Face VelocityArea Factor calculation assumes gravity shutter blades fully open (100%).

Pressure Loss

0 200 400 600 800 1000 1200

0.04

0.08

0.12

0.16

0.20

Pres

sure

Dro

p In

ches

w.g

Face Velocity fpm

Performance DataGravity Shutters

EXCELAIR Air Outlets | Technical Catalogue Gravity Shutters | Ordering Requisites

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Standard Colour RAL9010Mill Finish MF Other Colour (RAL CODE)

1. Type

2. Number Of Units

3. Size

4. Accessories

5. Colour

WxH

Foam Gasket F

Example

Gravity Shutter-Wall Mounted GS-WM

Gravity Shutter-Duct Mounted GS-DM

In Numbers

GS-WM 50 150mm X 150mm F RAL 9010

1 2 3 4 5

150 X 150 mm, 50 units of Gravity shutter-Wall mounted, with Foam gasket , white RAL 9010 finish.

Ordering RequisitesGravity Shutters

EXCELAIR Air Outlets | Technical Catalogue Disc Valve | Installation

6

EXCELAIR Air Outlets | Technical Catalogue Gravity Shutters | Notes

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NotesGravity Shutters


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EXCELAIR GD1000 SERIES Available in RAL 9010 & 9016 Colors.

All other colors are available on request.

Coyright

Tel: +971 4 3416337, Fax : +971 4 3416338P.O Box: 60270, Dubai, United Arab [email protected]

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Gravity Shutters