Chest Seals

Chest seals close an open ("sucking") chest wound so the lung can re-expand — and the CoTCCC-recommended vented designs let trapped air escape to reduce the risk of a tension pneumothorax. Occlusive seals in vented and non-vented configurations.

Chest seals are the R in MARCH. Pair with airway management and a means to monitor breathing.

Chest Seal Selection Guide

The R in MARCH. Seal open chest wounds and vent trapped air to prevent tension pneumothorax. Shop by seal type -- vented, non-vented, or combo packs.

Vented
Chest Seals

HyFin Vent, Bolin, Sentinel, FOX, Beacon

Non-Vented
Occlusive

HyFin, Russell, Beacon, HALO Seal, HALO XL

Twin &
Combo Packs

HyFin USMC, SAM Combo, HALO Combo

Chest seals are the R in MARCH. Pair with airway management and a means to monitor breathing.

How a Chest Seal Works

A penetrating chest wound can open a path for air to enter the pleural space from outside. As that air accumulates, it collapses the lung and — if pressure keeps building — pushes the mediastinum across, choking off venous return in a tension pneumothorax. A chest seal is an occlusive dressing that closes the hole so the lung can work, while a vented design gives trapped air a one-way path out.

Vented vs. non-vented

Type	How it works	Note
Vented	One-way valve or channels let air escape but not re-enter	CoTCCC-recommended; lowers tension-pneumothorax risk
Non-vented	Fully occlusive; requires manual "burping" if pressure builds	Acceptable when a vented seal isn't available

Application doctrine

Expose and dry — wipe the skin so the seal adheres; blood and sweat defeat the adhesive.
Seal entry and exit — a through-and-through wound needs a seal on both sides.
Watch for tension — rising distress means lift or "burp" a non-vented seal, or confirm the vent is clear.
Carry two — most penetrating chest wounds warrant more than one seal.

Stocking for penetrating trauma? Carry vented seals in pairs alongside hemorrhage control. Anchor your loadout with the trauma-response brief.

Frequently Asked Questions

What is a chest seal used for?

It closes an open chest wound so air can't enter the chest cavity from outside and collapse the lung. Vented seals also let trapped air escape, reducing the chance of a tension pneumothorax.

What is the difference between a vented and non-vented chest seal?

A vented seal has a one-way valve or channels that let air out but not back in; a non-vented seal is fully occlusive and must be lifted or burped if pressure builds. CoTCCC recommends vented designs.

Do I need to seal both sides of a chest wound?

Yes, if the wound is through-and-through. A gunshot or penetrating injury with an exit wound needs a seal over both the entry and the exit, which is why kits commonly carry two.

How do you burp a chest seal?

If a casualty with a non-vented seal develops rising breathing difficulty, lift one edge of the seal briefly to let trapped air escape, then reseal. A vented seal is designed to do this automatically.

Will a chest seal stick to bloody skin?

Adhesion is the weak point. Wipe the skin as dry as possible before applying, and press firmly around the whole edge. Carry a backup, since blood and sweat can defeat the adhesive.

Related collections

MED-TAC International Corp. is a clinician-founded, veteran-led tactical medicine provider. Product references to CoTCCC reflect committee recommendations and do not imply FDA approval or certification. This content is educational and is not a substitute for hands-on training or medical direction.

Vented vs. Non-Vented: Which Chest Seal Do You Need?

An open chest wound allows air to enter the pleural space. If air cannot escape, pressure builds -- causing a tension pneumothorax, the second leading cause of preventable battlefield death.

Vented Chest Seals CoTCCC Recommended

Vented seals feature a one-way directional valve (typically a 3-channel design) that lets trapped air escape while preventing additional air from entering. This passive venting reduces the risk of tension pneumothorax without requiring intervention.

3-vent channel design (HyFin) or multidirectional vent (Sentinel, Bolin)
Passive air evacuation -- no manual burping required
CoTCCC-preferred for all penetrating chest trauma
Works across blood, sweat, hair, and water-contaminated skin

Non-Vented / Occlusive Backup / Multi-Use

Non-vented seals create a complete occlusive barrier over the wound. Without a vent, trapped air must be released manually by briefly lifting the seal ("burping"). Ideal as a backup, for multi-use coverage, or when vented seals are unavailable.

Full occlusive barrier -- no air passage in either direction
Requires monitoring and manual burping to release trapped air
Larger formats (HALO XL) for covering surgical sites or securing gauze
Combo packs pair one vented + one non-vented for entry/exit wound pairs

Application Technique

Wipe the wound site. Remove blood, sweat, and debris. Adhesive bonds fail on contaminated skin.

Apply firmly over the wound, starting from the center and pressing outward to seal all edges.

Check the seal. Look for lifted edges. If the seal fails, remove and reapply with a fresh seal.

Chest Seal Product Comparison

Compare all 17 chest seals by type, packaging, and key features to find the right seal for your kit.

Product	Type	Packaging	Key Feature	CoTCCC Status
HyFin Vent Twin Pack	Vented	Twin Pack	3-vent channel design, NAR's flagship vented seal	Recommended
HyFin Vent Compact Twin	Vented	Compact Twin	Reduced footprint for slim IFAK configurations	Recommended
HyFin Vent Individual	Vented	Single Pack	Individual vented seal for solo carry	Recommended
HyFin USMC Combo Pack	Combo	Combo (1 Vented + 1 Non-Vented)	Marine Corps standard -- addresses entry and exit wounds	Recommended
HyFin Chest Seal	Non-Vented	Single Pack	Traditional occlusive seal, NAR original design	Not Separately Reviewed
Bolin Chest Seal	Vented	Single Pack	One-way directional valve, Safeguard Medical	Recommended
Sentinel Chest Seal	Vented	Single Pack	Multidirectional vent technology, Safeguard Medical	Recommended
FOX Chest Seal Twin	Vented	Twin Pack	Low-profile vented design, flexible adhesive	Not Separately Reviewed
Beacon Vented	Vented	Single Pack	Medical-grade hydrogel adhesive, performs on wet skin	Not Separately Reviewed
Beacon Non-Vented	Non-Vented	Single Pack	Hydrogel adhesive bonds through blood, sweat, sand, water	Not Separately Reviewed
HALO Vent IFAK Two Pack	Vented	Twin Pack	IFAK-sized vented seals, aggressive adhesive	Not Separately Reviewed
HALO Seal IFAK Two Pack	Non-Vented	Twin Pack	IFAK-sized occlusive seals, multi-use coverage	Not Separately Reviewed
HALO Seal COMBO IFAK	Combo	Combo (1 Vented + 1 Non-Vented)	Vented + non-vented pair in compact IFAK packaging	Not Separately Reviewed
HALO XL	Non-Vented	Single Pack (Large)	Oversized occlusive dressing for large wounds or securing gauze	Not Separately Reviewed
SAM Chest Seal COMBO	Combo	Combo (1 Vented + 1 Non-Vented)	Vented + non-vented pair, SAM Medical adhesive technology	Not Separately Reviewed
Russell Chest Seal	Non-Vented	Single Pack	Simple occlusive barrier, economical backup option	Not Separately Reviewed
Lightning-X Vented	Vented	Single Pack	Vented design at a value price point	Not Separately Reviewed

CoTCCC alignment does not infer anything about a product's quality or effectiveness. CoTCCC recommends vented chest seals for the treatment of open chest wounds. Always carry at least two seals -- penetrating trauma often produces both an entry and an exit wound. FDA and CE compliant where applicable per manufacturer specifications. This comparison table is not all-inclusive and is subject to expansion or retraction at any time. MED-TAC does not claim to offer every chest seal option on the market.

Evidence-Based Selection

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Single vendors excel in one category but underperform in others. We select the best tourniquet from one brand, the superior hemostatic from another, the top chest seal from a third -- optimizing kit performance over vendor politics. Result: 13% higher effectiveness vs. single-vendor averages.

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Chest Seals