Features:
Three models available:
Pressure independent in either constant volume or variable volume (two positions or modulating); Pressure dependent with integral flow measurement.
Fully pressure independent to within 5% of set-points between 0.6" and 3.0" WG pressure drop across the valve. (Special valves are available that can operate as low as 0.3" WG pressure differential. Consult factory for details).
Pressure dependent models with integral flow measuring station having a measurement accuracy of 2%, providing a true closed loop system.

Fail safe operations per NFPA-45. Normally open (NO) valves (fails in open position) are standard.
Field convertible from fail open, closed or at one of the preset min/max CFM positions.
Dependable pneumatic or electronic operators.
All valves have shut-off capability. Less than 1% leakage rate when fully closed.

Sound power levels below ASHRAE recommended levels for hospital private rooms.
10:1 turndown up to 100:1 depending on application.

Options:
Available in type 304 or 316 spun stainless steel. or application specific
Corrosion resistant coating.
Spring return and/or modulating electronic actuators.
Teflon bearings.
Flow measuring station.
Flanges at inlet and outlet connections
Matching media-free (Packless) silencers
Integral heating coils.
Factory mounting of controls.