I do not have specific information about a product called "Whisper Aero" or its propulsors. It's possible that this technology has been developed or introduced after i lost interest in that topic.
However, in general terms, noise concerns in leaf blowers and HVAC systems are common issues that manufacturers and engineers try to address through various means:
Improved Fan Design: Redesigning the propellers or impellers in leaf blowers and HVAC systems can help reduce noise generation while maintaining adequate airflow.
Noise Dampening Materials: Using noise-absorbing or noise-damping materials in the construction of leaf blowers and HVAC components can help reduce the propagation of noise.
Sound Insulation: Incorporating sound insulation or enclosures around the motor and fan assemblies can contain noise within the system, reducing the noise that reaches the surroundings.
Vibration Isolation: Isolating the motor or fan assembly from the unit's housing can reduce noise transmission through vibrations.
Variable Speed Control: Adding variable speed control to the motors can allow users to adjust the fan speed as needed, potentially reducing noise levels during lower power operation.
Advanced Technology: Some companies may develop proprietary technologies that specifically target noise reduction in their products. This may involve innovations in fan design, motor control, or noise cancellation methods.
If "Whisper Aero" is indeed a product designed to address noise concerns in leaf blowers and HVAC systems, it is likely to utilize some combination of the methods mentioned above or potentially introduce new and innovative approaches to noise reduction. To learn more about the specific features and technologies used in Whisper Aero's propulsors, I recommend visiting their official website or contacting the company directly for up-to-date information.