This is an older model, which ONLY works with a 6-speed wireless remote speed controller supplied with each fan. This model does not support any other speed controllers. 

* REMOTE SPEED ADJUSTMENT: Using wireless remote speed controller ECMF-R series fans' speed can be adjusted from 15%-100% without creating any additional hum or background noise. The remote controller allows selecting among 6 pre-set speeds from up to 50 FT range.
* STORES LAST SPEED SETTING: This unit will store your last selected speed setting in its memory. It will come back at the stored speed when the power is shut down and turned back on via a switch or a timer.
* ENERGY SAVINGS: Built with cutting edge brushless electronically commutated Motor (EC) motor and dual jet type impeller, our new 10" ECMF series fans deliver 946 Cubic Feet per Minute (CFM) of Airflow using only 126 Watts
* COLD ROLLED STEEL HOUSING: Resists accidental damage, harsh elements and reduces maintenance in demanding applications such as ventilation of grow tents, gardens, farms, crawl spaces, attics, etc
* COMPACT: Only 12.13" (L) x 7.87" (W) x 8.94" (H). Ideal applications with minimal space available. Installation hardware (screws and anchors) included in set
* ETL LISTED WITH 2 YR WARRANTY: ECMF-R series fans are ETL listed and Conform to UL standard 507, Certified to CSA Standard C22.2 No 113. Covered by 2 year warranty