This article compares three schemes of fan control used on large air conditioning and refrigeration condensers. The first scheme is step control; the second is a hybrid with a VFD on only one bank of fans, while the rest remain step controlled. The final, and most efficient, scheme is VFD control of all fans, at all times.
The International Green Construction Code (IGCC) has become the first building code to adopt minimum efficiency levels based on AMCA Standard 205, Energy Classification for Fans.
Many homeowners dealing with winter roof ice dams or summer high attic temperature problems due to inadequate attic ventilation now have the option of adding booster fans under existing roof vents instead of cutting additional holes in their roofs to install attic ventilation fans, the manufacturer says.
Hartzell has announced the appointment of Sean Steimle as the new president of its Hartzell Air Movement business. He joins Hartzell after more than 13 years in the air moving industry. Steimle will report to Jeff Bannister, Hartzell CEO.
Direct drive wall fans are designed for compact and cost-effective through-the-wall general ventilation applications. These multispeed axial fans feature aluminum fan blades and a plated steel wire guard in sizes ranging from 10 to 30 inches.
Featured in an updated 24-page catalog are the manufacturer’s Model SP and CSP centrifugal ceiling and cabinet exhaust fans, designed for clean air applications requiring low sound levels. AMCA-certified and Energy Star-rated fan models are highlighted, along with new grilles and lighted grille lens options.
In an effort to better communicate its position as a leader in the high volume low speed (HVLS) fan industry, MacroAir announced that it has transformed its company brand identity and launched a new website.
Photos from the 2013 ACCA Conference & IE3 Expo in Orlando, Fla.
Podcasts
Cade Clark, assistant vice president of government affairs for the Air-Conditioning, Heating & Refrigeration Institute (AHRI), gives a brief overview of the new version of the Shaheen-Portman bill, what AHRI thinks of the energy-efficiency legislation, and how it might affect the HVACR industry if it becomes law.
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