Which of the following statements about air volume for combustion is true?

The statement regarding the need for the volume of air to be standardized for safety is true because proper air volume is essential to achieve complete combustion of natural gas. When combustion occurs, a precise mixture of fuel and air is required to ensure that the gas burns efficiently and safely. Insufficient air can lead to incomplete combustion, increasing the risk of producing dangerous carbon monoxide and other harmful emissions. Standardizing air volume ensures that appliances perform effectively and minimizes safety hazards, thereby upholding regulatory standards and guidelines for safe operation.

Other statements fail to capture the fundamental principles of combustion. Significantly varying air volumes could lead to inefficiency and unsafe conditions, while a higher BTU input actually increases the required air volume needs, contrary to what one of the statements suggests. Additionally, appliances inherently require specific air volumes tailored to their design and operation for optimal combustion.