Description
DuraVent DVL DuraLiner 8" Masonry Thimble With Slip Connector w16.5 Available in 24" x 12" 1200W WM6 NG DMI G9T F5P NB Available in 24" x 12" Three vaned blades require more torque power (the force required to get a mass moving) to start their great mass and overcome the greater drag of their increased surface area maintained In case of a chimney fire