STEALTH® Fan Filter Units are the low noise, energy saving choice for all applications where sound levels and worker comfort are essential. Advanced STEALTH® technology allows these units to last up to three times longer than other units, require only 100 watts at full speed and run at 90 FPM while providing minimum 99.999% filtration efficiency. Nominal noise level is 51-55 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). The STEALTH® can be designed to accommodate conventional T-Bar grid, gel channel grid or HEPA Corporation's own Q3-4000 GRIDLESS® Ceiling Filter System.