Expanding on Super Vac's already-popular lineup of non-proprietary fans, the Stihl -BT fan is available in a 16 in. wheel/handle model, Super Vac's easy-to-maneuver 18 in. design and now, the market's most powerful 20 in. battery fan! Featuring new electronics and a brushless motor, Super Vac's game-changing Stihl fan delivers V-MAX airflow on dual AP 300S or AP 500S batteries — the same batteries powering the ever-popular Stihl ventilation saw found on today’s fire ground, making this yet another coveted Super Vac battery fan to hit the market.