face velocity

face velocity

The velocity of air at the face of an air diffuser or air terminal unit.
References in periodicals archive ?
This means it was ASHRAE 110 containment tested with the sash fully open (28" above the work surface) at a 60 feet per minute (fpm) face velocity, and there was less than an average of 0.
Hood monitors are required by code to monitor hood face velocity and provide alarms if velocity is below a minimum setpoint.
The assumption that higher face velocity is better results in oversized HVAC systems in laboratory facilities that do not necessarily meet the needs of user safety.
3]), exhaust temperature (18-102 [degrees]C), diesel exhaust face velocity (0.
The CE's low flow constant volume by-pass design maintains consistent face velocity.
Also, various technologies for managing airflow through fume hoods have become more widely accepted, including such measures as zone presence sensors to reduce face velocity when an operator isn't present, automatic sash closers and constant face velocity flow control, according to Yacknowitz.
The enthalpy difference increase combined with zero superheat and the greater heat transfer coefficient allows selection of a smaller evaporator coil for higher face velocity and reduced face area (which can lower cost).
The current face velocity is displayed at all times.
The average particle count efficiencies of the filter media with DOP aerosol under the medium face velocity 0.
A face velocity at 100 fpm ensures containment of fumes and an alarm will alert the operator when the airflow falls to an unacceptable level.
Typically such projects include the installation of an arm or other dust extraction initiative where the face velocity is, for instance, too low to capture the dust and "in-duct"/arm velocity has insufficient strength to carry debris; or perhaps hoping for effective capture of fume 400 - 500mm away from source in a slot system.
We improve the flow into the filter and there is a reduction in face velocity, which reduces restriction and increases your capacity.