Larson Electronics has released a 24-in explosion proof ventilation fan ideal for areas where flammable gases, vapors, or finely pulverized dusts may exist. The EPF-HPSM-24-480V high-pressure explosion proof ventilation fan from Larson Electronics features three spark resistant cast aluminum blades that move stale air at a rate of up to 6,860 cubic ft per minute. The frame is made of heavy duty 14-gauge steel that is completely arc welded with tubular supports. This unit is rated for use in Class 1 Group D and Class II Groups F and G hazardous areas.
Howden American Fan Company has introduced its new ventilation concept for underground parking garages, which includes two alternative options — the Jet Thrust Fan and the Induction Thrust Fan. The company says the new system lowers the required parking garage height by about 4 ft, reducing excavation and cement costs and lowering overall construction costs.
A few months ago, this column covered the basics of developing effective control system sequences. You might recall that it discussed the process of how a designer needs to select and describe sequences that provided safe, reliable, and efficient control.
Alfa Laval has introduced a patented cooling concept, Low Speed Ventilation, which the company says delivers air at a considerably lower speed: 1.5 to 1.8 meters per second. Reducing air speed and delivering an optimum airflow eliminates the Venturi effect, minimizes pressure differences, and therefore prevents problems such as “hot spots.” As LSV is a normal pressure technology, data center operators only need to control air availability, not air pressure, making it easier to achieve optimum conditions in the server room.
This month, a consultant and NFPA committee chairman looks at the major items involved in a hospital’s life safety design. Like the fire risks themselves, the assorted relevant codes are evolving with regard to specifics like smoke dampers. HVAC wall penetrations, alarm zoning, and response plans are just three other aspects to consider in this demanding design environment.
ASHRAE 170 is just the baseline for the fight against hospital acquired infections (HAIs). The ongoing human and financial tolls taken by these infections point to the need for engineers and facilities to raise their IAQ game wherever possible. Move beyond the minimum and get into the what, where, and how of HEPA filtration, ultraviolet technology, and catalytic air cleaners.