Final answer:
Warm-air vents in a forced-air heating system are usually located near the floor to allow for the even distribution of heated air throughout the room.
Step-by-step explanation:
Warm-air vents in a forced-air heating system are usually located near the floor. This is because warm air tends to rise, so placing the vents at a lower level allows the heated air to distribute more evenly throughout the room. By placing the vents near the floor, the warm air can rise and create an upward convection current, effectively heating the room from bottom to top.
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