If horizontal ducts are used to bring in fresh air, how much space is needed per 2000 Btus?

The correct answer indicates that for every 2,000 Btus of input, 1 square inch of area is required for fresh air intake when using horizontal ducts. This guideline is crucial in ensuring sufficient ventilation for appliances that operate on gas, as proper air supply is necessary for safe and efficient combustion.

When calculating the intake requirements for fresh air, it's important to remember that sufficient air is needed not only for the operation of the gas appliance but also to maintain safety and prevent issues such as back drafting or incomplete combustion.

This specific ratio helps ensure that the equipment has access to enough fresh air to operate effectively while minimizing the risk of hazards associated with gas appliances. The recommendations are typically derived from standard ventilation practices that aim to provide an adequate balance of air supply to gas-fueled appliances.