The Emergency Vent is an economical solution to the present day emergency venting requirements. It is not intended as protection against an internal explosion, but to prevent excessive vapor pressure rise in the event of an external fire. It is available for use in normal, chemical or low temperature service.
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For lightly loaded vents, the entire hinged cover may be lifted open, providing a convenient inspection or access point through the unobstructed opening. Since unbolting and gasket replacement are unnecessary, the time saving alone is often sufficient to justify the use of this design of vent.

Emergency Vent is available in 250 mm (10") and 500 mm (20") sizes with flat face flanges to match a 10" ASA Class 125 and a 20" API Roof Manhole respectively.

For normal service applications, the steel manhole base has a weld deposited stainless steel seat facing and is fitted with a neoprene 'Tite' seal diaphragm. For chemical/low temperature service applications, the manhole base is of stainless steel construction and a PTFE coated glass cloth 'Tite' seal diaphragm completely covers the underside of the hinged cover.