Part 4 of four-part series: Fan System Effects A perforated plate can appear highly open and still create noticeable airflow resistance. The reason is that air does not move through the sheet as though it were passing through empty space; it must accelerate through many small openings, contract at the hole edges, and re-expand after
Fan System Effects: Elbows & Other Obstructions
Part 3 of four-part series: Fan System Effects In the lab, fans are tested with ideal inlet and outlet conditions: straight, uniform flow into the impeller and typically, a section of straight duct on the discharge to allow the velocity profile to smooth out and static pressure to develop. In the field, that ideal setup
Fan System Effects: Abrupt Change in Cross-Sectional Area
Part 2 of four-part series: Fan System Effects Abrupt changes in duct cross-sectional area are a frequent cause of fan system effects. When air is forced to expand or contract too quickly near a fan inlet or outlet, the flow separates, becomes turbulent, and no longer matches the smooth conditions assumed by the fan performance
Fan System Effects: What and How
Part 1 of four-part series: Fan System Effects Fan system effects are performance losses caused by poor airflow conditions at or near a fan’s inlet or outlet, such as swirl, turbulence, abrupt transitions, fittings too close to the fan, or other obstructions in the ductwork. For engineers, contractors, and specifiers, the practical issue is simple:
What is an Electronically Commutated EC Motor?
What is an Electronically Commutated EC Motor? An electronically commutated (EC) motor is designed to run on an alternating current (AC) power supply, but it in fact bears a closer resemblance to a direct current (DC) motor. It is essentially a permanent magnet, brushless DC motor that incorporates on-board electronics. The added electronics allow an
NEW DESIGN – TEK PLENUM FANS
Continental Fan’s TEK Plenum Fans have a robust new design and three new models. TEK plenum fans feature TEK backward curved airfoil wheels, HVAC’s quietest and most efficient OEM impellers. TEK Impellers combine precision injection molding techniques with modern high strength plastics to produce a wheel that is stronger than steel, yet half its weight.
EC Fan Array
An EC Fan Array is designed to move large volumes of air at medium to high pressures, and provides a sensible, cost-saving alternative to using a large, single fan system. Not only does the parallel action of the multiple fans in an EC Fan Array achieve the performance of a conventional large single AC fan,
