What interior chimney component helps prevent backdraft?

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Multiple Choice

What interior chimney component helps prevent backdraft?

Explanation:
Backdraft happens when wind or pressure differences push air down the chimney, so the pathway inside needs to be a smooth, sealed channel for gases to rise. The flue lining provides that continuous, inner surface and seals gaps in the interior masonry, reducing air leaks and turbulence that can cause reverse flow. Because it directly creates a stable, airtight route for smoke and gases to move upward, it best prevents backdraft compared with other components that are either external (like a cap) or movable (like a damper) or that mainly shape flow near the firebox (like the smoke chamber).

Backdraft happens when wind or pressure differences push air down the chimney, so the pathway inside needs to be a smooth, sealed channel for gases to rise. The flue lining provides that continuous, inner surface and seals gaps in the interior masonry, reducing air leaks and turbulence that can cause reverse flow. Because it directly creates a stable, airtight route for smoke and gases to move upward, it best prevents backdraft compared with other components that are either external (like a cap) or movable (like a damper) or that mainly shape flow near the firebox (like the smoke chamber).

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