Burst valve

A valve assembly comprising:

• a valve housing having:
• a first axial end, a cap, a second axial end, and an airflow pathway extending from the first axial end towards the second axial end, wherein the cap is positioned towards the second axial end,
• an environmental opening configured for fluid communication with an outside environment, and
• an enclosure opening towards the first axial end configured for fluid communication with an interior of an enclosure;
• and
• a film disposed in the valve housing laterally across the airflow pathway and along the airflow pathway between the enclosure opening and the environmental opening, wherein the film has an expansion diameter, wherein the film comprises a perimetric region that has a fixed position relative to the cap,
• wherein the cap comprises an inner lateral surface and a piercing protrusion extending from the inner lateral surface of the cap towards the first axial end, and wherein the piercing protrusion comprises a piercing tip,
• wherein an axial distance is defined between the film and the inner lateral surface, and wherein a ratio of the axial distance to the film expansion diameter is greater than 0.14.