CHALLENGER™ Fan Filter Units are the industry standard, energy saving choice for all applications where moderate sound levels and economy are important. Advanced CHALLENGER™ technology allows these units to last over two times longer than other units, require only 100 watts at full speed and run at 90 FPM while providing up to 99.999% filtration efficiency. Nominal noise level is 57-61 dbA at 90 FPM. The variable speed control allows the user to fine tune airflow to suit specific requirements. A variable frequency drive, remote operation or addressable controllers can be added. Available in 2'x2' and larger modules, units are UL approved with standard 115V, 230V or 277V motors (other input voltages are optional). CHALLENGER™ Fan Filter Units are suitable for all applications, including cleanroom upgrades, new construction, in OEM equipment and anywhere additional ducting or air handling equipment is not desired. The CHALLENGER™ can be designed to accommodate conventional T-Bar grid, gel channel grid or HEPA Corporation's own Q3-4000 GRIDLESS® Ceiling Filter System.