What is the minimum distance that a vent from an appliance with an input of 110 Mbtu/h can be from a non-mechanical air supply?

For appliances with an input of 110 Mbtu/h, the minimum distance that a vent must be from a non-mechanical air supply is defined by safety standards to ensure adequate combustion and prevent backdrafting. The requirement for a distance of 3 feet is based on mitigating any potential issues that might arise from the interaction between exhaust gases and the air that is being drawn into the combustion space.

This distance allows for proper dispersion of exhaust gases, which is crucial for maintaining a safe and efficient operation of the appliance. It minimizes the risk of the vented gases being reintroduced into the combustion air supply, which can lead to hazardous conditions.

While lesser distances may be defined for appliances with lower input capacities or different operational characteristics, for a unit of this size, adhering to the 3-foot minimum is essential for ensuring compliance with regulations and promoting safe operation. This standard aligns with best practices in venting and combustion system design.