The Super Vac Smoke Ejector is the most popular smoke ejector in the fire industry, this 16" electric, single-speed Super Vac Smoke Ejector delivers the perfect combination of size and power, perfect for departments that need an everyday smoke ejector. This fan pulls smoke from structures using negative pressure but can be flipped around for positive pressure tactics. Smoke ejectors are most effective when working with natural airflow and not against Mother Nature.Patented 4-tip recurve Aluminum Blade holds up better than plastic in high heatPrecision Balanced Blade maximizes outputRubber Feet heavy duty rubber adds friction to keep fan in place4 Carry Handles makes transportation easy with 1 or 2 peopleFront and Rear Guards prevents accidental contact with key components