Yeah, but they didn't really go into fan efficiency with pressure drops or motor efficiency.
One other thing is longevity and even safety. Maybe their use of multiple filters reduces the pressure enough. But if it doesn't, then the motor will wear out pretty quickly and could potentially start a fire if it's generating enough heat. The motor in my setup gets pretty hot when running at full power.
One other thing is longevity and even safety. Maybe their use of multiple filters reduces the pressure enough. But if it doesn't, then the motor will wear out pretty quickly and could potentially start a fire if it's generating enough heat. The motor in my setup gets pretty hot when running at full power.