Pressure Relief Vents
IGV-R Gas Vent Reverse Flow
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- EWCL5 with up to 2-hour fire resistance to BS EN 1634-1:2014
- 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-R range of gas vents are designed for under-pressure venting associated with Synthetic gas high-pressure Fire Suppression Systems, where over-pressure is not an issue and the SGV Dual-Flo® is not required.
*The vents can also provide protection against over-pressure venting with inert gases as they have the unique feature of reversible flanges which allows installers to alter the flow configuration on-site and keep the units housed within the wall to avoid protrusions. Please refer to IGV product details for further information.
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 100 mm increments. They provide market-leading performance across a range of pressures, which BSRIA has validated under laboratory conditions to recognised standards. The vents are designed to remain closed below 70 Pa opening pressure to allow room integrity testing to be carried out with ease. The units are also fully open at 100 Pa, giving you the best possible protection for your building.
The IGV-R has been successfully tested at EXOVA Warrington Fire following the performance test criteria of BS EN 1634-1, achieving up to 2 hours fire resistance.
Vent Model 0303 and upwards fits into an internal wall thickness of 115 to 200mm with external walls 190 to 200mm.
Models 0501 & 0301 external and internal wall depths are 115mm to 200mm.
Deeper walls can be accommodated with the use of our easy-fit wall liner extensions. For narrower 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 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 risk of over and under-pressurisation resulting from the use of gaseous 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 and prevents 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-R-0301 0.034 Internal
0.034 External with FWC440 x 252 360 x 170 4.0 IGV-R-0501 0.055 Internal
0.055 External with FWC640 x 252 560 x 170 6.0 IGV-R-0303 0.092 Internal
0.059 External with FWL440 x 452 360 x 370 8.5 IGV-R-0505 0.250 Internal
0.163 External with FWL640 x 652 560 x 570 17.0 IGV-R-0707 0.483 Internal
0.319 External with FWL840 x 852 760 x 770 28.0 IGV-R-1010 0.976 Internal
0.650 External with FWL1140 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.Wall Depths
Vent Position Accessory Wall Depth Range IGV-R-0303 and upwards Internal
External
ExternalWall Liner
Fixed Weather Louvre
Dynamic Cover Seal115-200mm
190-200mm
115-195mmIGV-R-0301 & IGV-R-0501 only Internal
ExternalWall Liner
Fixed Weather Cowl115-200mm
115-200mmDeeper walls can be accommodated with the use of our easy-fit wall liner extension sleeves in 75mm increments. For doors and thin walls, the use of our C-frame Kit can be utilised.
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Internal Wall Installation
This typical installation consists of:
1 x IGV-R Gas Vent
1 x Wall LinerExternal Wall Installation
This typical installation consists of:
1 x IGV-R Gas Vent
1 x Fixed Weather LouvreDeep Wall Installation
This typical installation consists of:
1 x IGV-R Gas Vent
1 x Extension Sleeve
1 x Wall LinerNarrow Wall Installation
This typical installation consists of:
1 x IGV-R 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.
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Pressure Relief Vents
IGV Inert Gas Vent
- The IGV inert gas vent is designed specifically for over-pressure venting associated with inert gas high pressure Fire Suppression Systems.

Pressure Relief Vents
IGV-M Motorised Inert Gas Vent
- The IGV-M Motorised Inert Gas Vent is designed specifically for over-pressure venting associated with Inert gas Fire Suppression Systems.