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As the company behind the only purposefully engineered, prefabricated MRI quench vent solution, we understand the importance of quench safety. We’ve prepared a glossary of terms to help you understand the dangers of a quench and the components of a quench vent that keep you protected.

Bellows Section

A corrugated, stainless-steel vent component engineered to accommodate thermal contraction of the quench vent system during a quench event. It relieves stress on connected piping and ensures structural integrity under extreme temperature changes.

Box Discharge

A horizontal termination component used at ground level. It incorporates protective screens to disperse cryogenic gas droplets safely and prevent injury or property damage.

Capped Roof Termination

A vertical rooftop termination designed to disperse helium gas upward. It incorporates protective baffling to prevent rainwater intrusion and wildlife entry.

Cryogen

An extremely cold substance (such as liquid helium) used to cool superconducting magnets. Cryogens are stored and handled under specialized conditions due to their ultra-low temperatures.

Discharge Cone

A conical termination for a horizontal sidewall that discharges at elevated levels. It ensures controlled gas expansion while preventing rain or debris from entering the system.

Elbows (30°, 45°, 90°)

Directional fittings used to change the routing of the vent system horizontally or vertically, while maintaining proper airflow characteristics.

End Cap

A closure fitting used to seal unused vent openings. It also provides access for inspection, cleaning or maintenance of the system interior.

Flashing & Rain Collar

Sealing components used at roof penetrations. Flashing provides the base weatherproofing, while the rain collar protects against water ingress and ensures long-term watertight integrity.

Guy Section

A structural reinforcement component installed when the vent extends beyond the roofline. It is designed to be secured with guy wires or rigid braces to maintain stability against wind and other loads.

Helium (Liquid and Gas)

A cryogen used to cool MRI magnets. When transitioning from liquid to gas, helium expands roughly 750 times in volume, requiring controlled venting during a quench event.

Insulated Thimble

A penetration component used when routing the vent through freezable walls or roofs. Its insulated construction prevents condensation and freezing at the penetration point.

MRI (Magnetic Resonance Imaging)

A diagnostic imaging technology that uses powerful magnetic fields and radiofrequency signals to generate detailed images of internal anatomy. MRI relies on superconducting magnets cooled with liquid helium.

Oxygen Deficiency Hazard (ODH)

A hazardous condition where oxygen concentration in the MRI suite falls below safe breathing levels due to helium displacing air during a quench.

Oxygen Monitor

A safety device installed in MRI suites to continuously measure oxygen concentration. It triggers alarms if oxygen levels fall below set thresholds.

Quench

A sudden loss of superconductivity in the MRI magnet. During a quench, liquid helium rapidly vaporizes into gas, releasing large volumes of helium and collapsing the magnetic field.

Quench Termination Point

The final outlet of the quench vent system for where helium gas disperses into the atmosphere. Termination types include rooftop caps, discharge cones or box terminations, depending on site and design requirements.

Quench Vent (Quench Pipe)

A dedicated venting system designed to discharge helium gas safely outdoors during a quench. It prevents helium accumulation in the MRI suite, thereby protecting occupants and equipment.

RF Shielding

A specifically engineered barrier system — typically made of copper, aluminum or steel — that encloses the MRI scanner room to block external radiofrequency (RF) signals from entering and interfering with MRI imaging. It also prevents RF energy generated by the MRI system from radiating outward.

Superconducting Magnet

The primary magnet within an MRI scanner, made of coils cooled to cryogenic temperatures to achieve superconductivity. This enables the generation of a strong and stable magnetic field required for imaging.

Support Plate

A load-bearing structural element that supports vertical exhaust sections and establishes fixed points in breeching runs. It helps maintain stability and alignment throughout the vent system.

Tapered Increaser / Eccentric Increaser

Transition fittings used to change vent diameters. An eccentric increaser maintains a flat alignment along one side of the duct, useful for clearance or drainage requirements.

Vent Insulation

Thermal insulation applied between the inner and outer vent walls to prevent freezing, condensation and structural stress during extreme temperature fluctuations.

Vent Integrity Test

A test or inspection performed to verify that the vent system is structurally sound and free of leaks, obstructions or mechanical damage.

Wall Support / Wall Guide

Anchoring devices used to stabilize long vertical vent runs against adjacent building walls. They ensure alignment, clearance and secure load transfer without restricting thermal movement.

Waveguide

A specialized component used when the vent system penetrates RF-shielded MRI rooms. It allows the quench vent to pass through the shielding barrier without compromising radiofrequency isolation, while still enabling safe helium discharge.

Didn’t find what you were looking for, or want to know more? We’re here to share our expertise. Talk to one of our specialists at: https://cryoduct.com/contact-cryoduct/