Which setup is considered the most efficient for ventilating a space about 60 feet away?

Which setup is considered the most efficient for ventilating a space about 60 feet away?

• A. 2 fans, 4 sections of 15 ft hoses
• B. 1 fan, 2 sections of 30 ft hoses
• C. 3 fans, 6 sections of 10 ft hoses
• D. 4 fans, 8 sections of 7.5 ft hoses

Answer: (A)

Ventilation efficiency over distance hinges on moving air with minimal pressure loss through the ducting. Friction builds up with hose length and with every connection, so you want enough reach without piling on excessive joints or too many fans that waste energy. Two fans pushing through four equal 15-foot hose sections gives the 60-foot reach with moderate, manageable friction. It provides enough static pressure to push air to the far end without overtaxing a single fan, and it avoids the extra losses from many short sections and numerous connections. A single fan would have to overcome the entire 60-foot run alone, which reduces the air reaching the distant area. Conversely, many short segments with several fans introduce more joints, leaks, and friction, which cuts efficiency despite the higher number of sections.

Ventilation efficiency over distance hinges on moving air with minimal pressure loss through the ducting. Friction builds up with hose length and with every connection, so you want enough reach without piling on excessive joints or too many fans that waste energy.

Two fans pushing through four equal 15-foot hose sections gives the 60-foot reach with moderate, manageable friction. It provides enough static pressure to push air to the far end without overtaxing a single fan, and it avoids the extra losses from many short sections and numerous connections. A single fan would have to overcome the entire 60-foot run alone, which reduces the air reaching the distant area. Conversely, many short segments with several fans introduce more joints, leaks, and friction, which cuts efficiency despite the higher number of sections.