What is the minimum height requirement for a main vent in relation to any vertical wall within 10 feet?

The minimum height requirement for a main vent in relation to any vertical wall within 10 feet is indeed 2 feet. This guideline is established to ensure that vent gases disperse effectively and do not accumulate or interfere with the airflow or ventilation of nearby structures. Having the vent raised to this height helps in preventing the vented gases from being re-ingested by the heating system or causing health or safety hazards in the vicinity. Maintaining this distance is critical for promoting effective operation and compliance with building codes and safety standards in forced-air and hot-water heating systems.