To generate high-velocity air from vacuum air in a 3" pipe, a minimum airflow of 50 CFM is required to pressurize air for filling a 6-foot blanket. The user suggests using an electronic blower but is concerned about the high costs associated with motors and impellers, aiming to keep expenses under $300. A vacuum cleaner is proposed as a potential solution that fits both the cost and flow rate criteria. However, it's emphasized that understanding the required pressure is crucial for selecting the appropriate blower. The discussion highlights the need for clarity on the specific application and requirements for effective airflow generation.