What type of vapors, fumes, or dust must not be conveyed by dust, stock, and refuse systems with energy recovery ventilation?

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The correct choice relates to the critical safety and health concerns associated with energy recovery ventilation systems in mechanical code practice. Energy recovery ventilation systems are designed to improve indoor air quality while minimizing energy waste by recovering heat and transferring it between incoming fresh air and outgoing stale air.

When it comes to the materials that can be handled by these ventilation systems, hazardous or flammable vapors, fumes, and dust pose significant risks. These substances can lead to dangerous situations like fire, explosion, or toxic exposure if they are improperly conveyed through the system. This is because their presence can compromise the safety features of the ventilation system, create adverse health effects for occupants, and result in code violations related to safety standards.

In contrast, other choices like odorous, non-toxic, or airborne substances may not present the same level of hazard, as they generally do not have the same explosive or toxic properties that could endanger health or safety. Therefore, the emphasis on prohibiting hazardous or flammable materials from being conveyed highlights the need for stringent standards in mechanical ventilation practices to protect both equipment and occupants.

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