Pressure Relief Vents
IGV Inert Gas Vent
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- EWCL5 up to 4 hour fire resistance to BS EN 1634-1
- BSRIA free vent area validation
- Single direction venting
- Fully open @ 100 pascals
- Removable flange to alter flow configuration
- Serial Number Traceability
- 10 Year Warranty as standard
Get a quoteThe IGV range of inert gas vents are designed specifically for over-pressure venting associated with Inert gas high-pressure Fire Suppression Systems.
The vents can also provide protection against under-pressure venting with Synthetic gases as they have the unique feature of having reversible flanges which allow installers to alter the flow configuration on-site and keep the units housed within the wall and avoiding protrusions from the wall.The Vents are offered in a number of standard sizes for installation in both internal and external walls with the availability of bespoke sizes in 75mm increments. Providing market-leading performance across a range of pressures which has been validated by BSRIA under laboratory conditions to recognised standards. The vents are designed to remain closed below opening 70Pa to allow room integrity testing to be carried out with ease. The units are also fully open at 100Pa giving you the best possible protection for your building.
The IGV has been successfully tested at EXOVA Warrington Fire following the performance test criteria of BS EN 1634-1, achieving up to 4 hours fire resistance.
The IGV is the first Inert Gas Pressure Relief Vent in the world that has been certified to EWCL5.
Vent Model 0303 and upwards fits into an internal wall thickness of 125 to 205mm with external walls 200 to 220mm.
Models 0501 & 0301 external and internal wall depths are 125mm to 205mm.Deeper walls can be accommodated with the use of our easy-fit wall liner extension sleeves. For thin walls, the use of our C-frame Kit can be utilised.
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Demand for Apreco inert gas vents is increasing with the recognised need for over and under pressure venting associated with Inert and Synthetic Gaseous Fire Suppression Systems.
Buildings are most commonly designed to withstand internal pressures of between 250 to 500Pa, though this can vary depending on the type of construction. The use of correctly sized and functioning pressure relief vents will protect such building structures from damage.
Apreco inert gas vents are of ‘counter-weighted’ design to prevent the risks of over and under pressurisation resulting from the use of gas fire suppression systems. The Apreco range of pressure relief vents have been successfully tested to EN1634-1 criteria to provide up to a 4-hour fire-resistance rating.
Specifically developed for these applications, the range can be used alongside a wide range of gas fire suppression systems to prevent structural damage and risk to personnel.
Maximum room pressure is controlled by the vents opening to allow air to escape, then closing when discharge is complete. This maintains the dilution of the air, so preventing re-ignition.
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Vent Sizes
Standard stock models shown and sized. Bespoke sizes available upon request
Model Free Vent Area
(FVA m2)Maximum size*
(W x H mm)Aperture size
(W x H mm)Weight**
(Kg)IGV-0301 0.034 Internal
0.034 External with FWC440 x 252 360 x 170 4.0 IGV-0501 0.055 Internal
0.055 External with FWC640 x 252 560 x 170 6.0 IGV-0303 0.092 Internal
0.059 External with FWL
0.092 External with DCS440 x 452 360 x 370 8.5 IGV-0505 0.250 Internal
0.163 External with FWL
0.250 External with DCS640 x 652 560 x 570 17.0 IGV-0707 0.483 Internal
0.319 External with FWL
0.483 External with DCS840 x 852 760 x 770 28.0 IGV-1010 0.976 Internal
0.650 External with FWL
0.976 External with DCS1140 x 1152 1060 x 1070 50.0 * Cover Grille maximum dimensions are 10mm greater than the stated IGV inert gas vent maximum size.
** Weights are indicative and relate to IGV inert gas vent and Wall Liner combined.
Vent Model 0303 and upwards fits into an internal wall thickness of 125 to 205mm with external walls 200 to 220mm.
Models 0501 & 0301 external and internal wall depths are 125mm to 205mm.
Deeper walls can be accommodated with the use of our easy fit wall liner extension sleeves. For doors and thin walls the use of our C-frame Kit can be utilised. -
Internal Wall Installation
This typical installation consists of:
1 x IGV Inert Gas Vent
1 x Wall LinerExternal Wall Installation
This typical installation consists of:
1 x IGV Inert Gas Vent
1 x Fixed Weather Louvre or Dynamic Cover SealDeep Wall Installation
This typical installation consists of:
1 x IGV Inert Gas Vent
1 x Extension Sleeve
1 x Wall LinerNarrow Wall Installation
This typical installation consists of:
1 x IGV Inert Gas Vent
1 x C-Frame Kit
1 x Wall LinerWall Liner
The Wall Liner is used to line the cavity produced in the substrate and with flanges that match that of the vent to produce a clean professional looking installation.
Cover Grilles
Apreco’s extensive range of cover grilles can be fitted directly to both the vent and Wall Liner through the provided fixing holes, not impeding on the Free Vent Area.
Extension Sleeve
The Extension Sleeve allows the Pressure Relief Vent to be installed in deeper walls, increasing the depth of the installation by up to a maximum of 75mm.
Fixed Weather Cowl
The Fixed Weather Cowls (FWC) (used on unit models 0301 & 0501 ONLY) ensure the vent is protected from the outside elements while not impeding the FVA performance.
Fixed Weather Louvre
Apreco’s High Free Vent Area (FVA) Fixed Weather Louvre (FWL) is used on external installations offers a large 65% FVA while ensuring the vent is protected from the outside elements.
Security Weather Louvre
The Security Weather Louvre has been designed specifically for use with Apreco’s range of Pressure Relief Vents with low loss 65% Free Vent Area. Robust design with a burglar-resistant rating of BR2.
C-Frame Kit
The C-Frame Kit allows the Vent to be installed in narrow walls. Each C-Frame Kit decreases the wall depth requirement of the installation by 135mm.
Narrow C-Frame Kit
The Narrow C-Frame Kit allows the Vent to be installed in narrow walls. Each Narrow C-Frame Kit decreases the wall depth requirement of the installation by 50mm.
Dynamic Cover Seal
The Dynamic Cover Seal (DCS) is used in conjunction with the IGV or PRV-F in positive venting applications, where additional sealing of the enclosure is required.
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