Answer :
Final answer:
Vent pipes on the exterior of a building must be protected against freezing if the 97.5-percent value for outside design temperature is 5°F or less, according to international building codes. This is because such low temperatures increase the risk of freezing, possibly leading to system malfunctions or damage.
Explanation:
Based on the international building codes, if the 97.5-percent value of the outside design temperature falls to 5°F or less, vent pipes must be adequately protected against freezing. This distinction is essential and precautions involving thermal insulation or trace heating are significant to prevent blockages caused by freezing, resulting in system malfunctions or even critical damage.
The 97.5-percent value represents temperature below which the outdoor air is only 2.5% of the time annually - a typically low winter temperature. Therefore, if that temperature is 5°F or less, due to the high risk of freezing, it's essential to protect your vent pipes.
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