Our Complete Ventilation Systems include all the most requested equipment you need for your confined space site. The systems include your choice of our most popular Centrifugal Blowers, 6′ & 15′ of ducting with a storage bag and a Manhole Ventilation Passthru (MVP). The Centrifugal Blower Systems offer lightweight portability with the highest output available. See individual blower descriptions for CFM, weight and other specifications.