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Providing proper ventilation when working with PVC conduit is essential primarily to carry off fumes from joint cement. PVC cement often contains volatile organic compounds (VOCs) that can be harmful if inhaled in a concentrated form. These fumes can irritate the eyes, throat, and lungs, and long-term exposure may lead to more serious health issues. Adequate ventilation helps to disperse these fumes quickly, ensuring a healthier working environment for individuals involved in the installation process.

While avoiding burns from hot conduit or preventing physical strain during installation are important safety considerations, they are not directly related to the specific concerns arising from using joint cement. Additionally, keeping the workspace clean is good practice but doesn't address the health risks associated with fumes, which is the primary concern when working with PVC conduit and its associated materials. Therefore, ensuring proper ventilation is crucial for safety and to mitigate the risks posed by the chemicals involved.