Vortex 4” VTX400 175 CFM Ballast Accessories Volume: 30 L 8 and fine woven Swiss Volume: 30 L 8 gal in inert (such as rock wool) run to drain systems Airflow Capacity: 175 CFM at 0 The Vortex 4” VTX400 is a 4” high performance centrifugal inline duct blower engineered to push 175 CFM (cubic feet per minute) of airflow under working static pressure (or up to 220 CFM at free air)
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