Which requirement applies to smoke detectors?

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Multiple Choice

Which requirement applies to smoke detectors?

Smoke detectors work best when they sit in the air path where rising smoke can reach them quickly. Placement matters because being too close to walls or too close to the ceiling can create stagnant air pockets that delay detection. The standard guideline uses clear distance rules: keep the detector a safe 4-inch minimum away from walls to avoid dead air along corners, and if you mount on a wall, position it at a distance from the ceiling that places it in the expected smoke plume path (not too close to the ceiling). This combination helps the sensor detect smoke sooner. The other options either describe maintenance activities or distances that don’t align with how smoke actually travels in a room.

Smoke detectors work best when they sit in the air path where rising smoke can reach them quickly. Placement matters because being too close to walls or too close to the ceiling can create stagnant air pockets that delay detection. The standard guideline uses clear distance rules: keep the detector a safe 4-inch minimum away from walls to avoid dead air along corners, and if you mount on a wall, position it at a distance from the ceiling that places it in the expected smoke plume path (not too close to the ceiling). This combination helps the sensor detect smoke sooner. The other options either describe maintenance activities or distances that don’t align with how smoke actually travels in a room.

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