What is a consequence of allowing unvented combustion products to accumulate in a venue?

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When combustion happens in an enclosed or poorly ventilated space, the byproducts can build up instead of being carried away. Carbon monoxide is a major risk because it’s colorless and odorless, and it binds to hemoglobin more effectively than oxygen, which can quickly lead to asphyxiation as the body’s tissues don’t get enough oxygen. Beyond CO, other toxic gases and irritants produced by combustion, such as nitrogen oxides and aldehydes, can cause toxic exposure, eye and airway irritation, headaches, and other health effects.

In addition, if any fuel or unburned hydrocarbons accumulate, they can mix with air to form an explosive atmosphere. A spark or heat source in that mix can trigger a rapid, violent explosion.

So unvented accumulation of combustion products in a venue can cause asphyxiation, toxic exposure, and the possibility of explosions—all of which makes the risk extremely dangerous.