Induced flow fans fall into two types or categories: centrifugal induced flow fans and vertical inline induced flow fans. Both of those types of fans are available in belt drive or direct drive configurations. While belt drive induced flow fans offer many safety, adjustability, and motor change out advantages, some clients prefer direct drive exhaust fans.
Motor change out on a direct drive fan of any type can be a time consuming, potentially dangerous, and difficult task. You need to have access to the fan equipment and you need adequate working space in the area. With vertical inline induced flow fans, that means the fan must be laid down in the roof or penthouse and disassembled for removal and replacement of the motor.
M.K.Plastics offers centrifugal induced flow fans in both fiberglass and coated steel construction, and we offer two unique options in the industry. Both options provide access to separate the impeller from the motor without having to remove the fan from the system or the roof.
For the fiberglass M.K.Plastics Axijet® induced flow fans, we offer EZ-4® construction. This is a direct drive centrifugal induced flow fan with the impeller physically attached to the motor shaft. The motor pedestal assembly is track mounted. The drive side of the fan casing can be unbolted, and the motor pedestal assembly can be pulled away from the fan for easy access to the impeller. The impeller can be removed and the motor can be changed without removing the fan from the foundation, system, or roof. Once the motor is replaced on the EZ-4®, the track mount assembly is simply pushed back and bolted into place.
For steel Axijet® fans, we reach the same goal somewhat differently — we offer a Swingout fan construction where the drive side of the fan assembly is on a door-type arrangement. The drive side of the casing unbolts. It is hinged on the fan casing, and swings out/open with the fan in place to provide access to the impeller for removal and motor replacement. Then, the Swingout door is closed, the latches are secured, the fan balance can be checked, and the fans can then be put back into service.
Of course, no solution is perfect — there are minor tradeoffs with either the EZ-4® or Swingout construction. These fans do require a slightly larger footprint than a conventional fan. There is also a modest price add for these features. Any time you change the motor on a direct drive fan, you have contact with the airstream components, which may or may not be an issue for a given application.
M.K.Plastics also offers centrifugal Axijets in AMCA drive arrangement #8. This arrangement allows the motor to be removed without airstream part contact. However it has a larger footprint, and should be installed on a concrete pad or inertia base, adding some cost and weight. The EZ-4® and Swingout options for M.K.Plastics Axijet® centrifugal induced flow fans provide motor change out in a much easier and less time-consuming range.
To learn more about M.K. Plastics and how we can provide your with their products and services, call us at 860.296.8886, email us, or visit us on the web. Don’t forget to stay up-to-date on all the industry news by following us on social media: Twitter, LinkedIn, Google+ and YouTube!