Description
The AC series consists of four types of centrifugal fans: DD, DS, DP, and DF, each with direct drive motors. The fans differ in their inlet, wheel, motor, and outlet configurations. They feature forward-curved wheels made of galvanized steel and are balanced according to VDI 2060 standards.

Traditional AC Motors
The fans use AC motors designed for direct assembly on the wheel, with thermal protection class B or F. The motors have permanently lubricated ball bearings with a life expectancy exceeding 40,000 hours under normal conditions. Operating temperatures range from -30°C to a maximum depending on the motor class.

ES Speed Control
AC series fans are compatible with ES series electronic speed controls, which may affect heat rise characteristics. Consultation with a distributor is recommended for specific applications.

Wheels
The fan wheels are forward-curved, quieter than backward-inclined wheels, and made of galvanized steel or aluminum. They are pre-balanced before assembly.

Technology Fans
The AC series uses AC motors, while the TAC tech series uses brushless DC motors for energy savings and advanced airflow control. TAC fans offer precise working point calculations and network connectivity.

Performance and Sound Measurement
Fan data is established by PLC laboratories according to AMCA and ASHRAE standards. Sound levels are measured in an anechoic chamber, allowing for accurate comparisons.

Consulting and Development
P.Lemmens Company specializes in air moving technology, offering development and manufacturing of centrifugal fans. They provide customer-specific solutions and were pioneers in applying high-tech DC motors to direct drive fans.

Quality Commitment
The company maintains large stocks and a unique production method to ensure quality and timely delivery. They focus on product improvement and customer satisfaction.

AC Range and Selection Program
The AC range is detailed in technical data sheets available online. A selection software allows simulation of fan performance under actual conditions, providing detailed technical data sheets.

Compliance
AC fans and ES speed controllers comply with European machine directives, ensuring conformity with application responsibilities.

Disclaimer
The company continuously improves its products and documentation, and cannot guarantee the information reflects the latest product version.