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The minimum distance that floor registers of vented floor furnaces must be from the wall is essential for ensuring proper airflow and efficient heating. A distance of 4 inches is specified to prevent obstruction of airflow, which can lead to inefficient heating, increased energy consumption, and potential overheating of the furnace. This clearance allows for adequate circulation of air around the register, promoting optimal performance and maintaining safe operational standards.

Other distances are not sufficient to ensure these factors. For example, a distance of 2 or 3 inches may cause air to be trapped against the wall, negatively affecting the heating efficiency. A distance lower than the recommended 4 inches could also increase the risk of heat buildup near the wall, potentially damaging surrounding materials or compromising safety. Thus, maintaining a distance of at least 4 inches from the wall ensures compliance with safety codes while maximizing the effectiveness of the heating system.