While our roof vents are designed for durability, as with all safety products, maintenance is recommended to ensure their effectiveness. This is predominantly inspection based more so than actual removal and replacement of parts. Our team can guide you through the maintenance requirements.

Our Blast Relief Roof Vents are made from high-quality, durable materials, such as stainless steel, aluminium and insulating products that are designed to withstand extreme conditions.

Our Blast Relief Roof Vents are designed to function independently of electrical systems, ensuring they remain operational even during power outages.

The Blast Relief Roof Vent has a flange which sits flat onto the roof of the building. It has pre prepared holes around this flange so that it can be bolted down. Use a proprietary building sealant underneath the flange to form a water tight seal.

As long as the building itself has been designed with some blast expectation in mind and has a flat surface around the aperture where the vent is designed to be fixed. The building material can be concrete or steel, the only difference from that will be the type of fixing that is used.

This will be down to the blast regime set out by the blast engineer. They will determine how much vent area is required for the size and construction of the building and also keep in mind what the building is used for.

Ideally, if known, the vent should be placed directly above the blast itself. This would provide optimum performance. However, it is likely that the building may have more than one potential source of ignition or detonation and in these cases, dependant upon the recommendations of the blast engineer, several roof vents may be called for. In striving for that optimum performance, we would always like the blast wave to push as evenly as possible across the surface of the release vent. This means that the top panel is lifted uniformly. However, internally generated blast waves (unlike external hemispherical blast waves) are very complicated and CFD modelling is often used in an attempt to determine its characteristics. If an uneven pressure onto the roof vent is anticipated, then consider the use of more than one unit, or perhaps reposition the vent so that the applied blast pressure is not attempting to force the vent open more from one side than another and in doing so retard or disrupt the release of the vent.

Again, dependant upon the size and shape of the building, the blast itself, the type of detonation and other factors, one would assume that by having the Blast Release Vent at the opposite end of the building to the blast, the resultant pressure will have further to travel to reach the vent and during that period may generate more unpredictability in how it bears onto the vent. Having the vent incorrectly positioned can also compromise its deployment. As a rule, always aim to position the vent whereby the blast wave will bear uniformly onto its surface so as not to compromise its opening and consequently how quickly it vents the room below.

The top panel is fitted with steel cable to mitigate the top panel from freely travelling through the air. However, always remember that we are trying to hold on to something that is literally being fired into the air at something in the region of 2,000 – 3,000 m/second by a blast wave that may have unpredictable characteristics. With this in mind, try to orientate the vent so that the restraint cable(s) face towards an area that has been designated as the most desirable in terms of potential damage from the vent lid or even sacrificial should it ever reach the point that the restraints fail under the blast loading. Restraint cables are not FM Approved products and risk assessments should be carried out on any blast mitigation product in relation to where it is positioned.

Quite simply, incorrect positioning of the roof vent in relation to the blast wave within the building. Specifying the incorrect blast pressure release value for its application, poor installation (the product leaves the factory ready to be simply bolted down to the building) or damaging the release bolts due to rough handling on site or even simple things such as a build up of snow on top of the vent during winter months which again may retard the release of the top panel.