<p><b>Frequently Asked Questions:</b></p> <p><b>What is included in set with ECMF fan?</p></b> <p>1. Fan pre-wired with a 6.5ft long cable and grounded 3-prong plug. 2. Variable speed controller. 3. Speed controller cable (16ft long). 4. Installation Hardware (Screws and Anchors).</p> <b><p>How to adjust ECMF series fan speed?</b></p> <p>Each ECMF fan is supplied with a variable speed controller. Speed controller is attached to the fan via the supplied cable. When connected, supplied speed controller allows users to select any speed between 0-100% of output according to the preferred use/noise level. If the speed controller is disconnected, ECMF fan will automatically work at 100% output. Speed Controller connects to the fan via a 16 Ft wire, which is independent from the power cable. </p> <b><p>Will other Rheostat Speed Controllers work with ECMF fan?</b></p> <p>Speed controllers designed for AC motors, such as typical rheostat speed controllers, will not work with ECMF series fans. If you need a replacement of ECMF fan speed controllers please contact TerraBloom’s customer service. </p> <b><p>What are the requirements for the fan's operating environment?</b></p> <p>ECMF fan can be operated in the environments with temperatures between 15°F(-10°C) to 140°F (60°C) and humidity levels not exceeding 90%. ECMF series fans have IPX4 IP Rating. </p> <b><p>What type of ball bearing used in ECMF series fans?</b></p> <p>ECMF fans are built with heavy-duty dual ball bearings rated for up to 70,000 hours of operation.</p> <b><p>Can ECMF fans be used for boost airflow in heater ducts?</b></p> <p>ECMF can be installed in heating ducts with most modern home furnaces, however, it is important to ensure that the air temperature in the duct is not over 140 °F. Please note, fire places and fire-based heaters supply air at over 140°F, which will cause ECMF fan to trigger overheat safety switch and/or cause deformation of the impeller.</p>