Hon&Guan’s PowerDual P4 is a compact 4 inch (100 mm) inline duct booster fan supplied with a stepless speed controller and US plug. On the brand PDP it’s specified at a maximum airflow of 130 CFM, which Hon&Guan also lists as 221 m³/h. The fan is designed for boosting airflow in short duct runs for applications such as grow tents, basements and attics. Official listings note a low 6 W power draw, 26 dBA noise level, 165 Pa max static pressure, and 4500 RPM speed, with dimensions of 185 × 97 × 97 mm (7.28 × 3.82 × 3.82 in) and universal 100–240 V input. The included controller allows quick manual adjustment to balance airflow and noise for the task at hand.