DuraVent FasNSeal 6" 29-4C Stainless Steel Test Port w68.8125 Each lava rock measures approximately

Each lava rock measures approximately 1/2-inch to one inch with a total bag weight of five pounds

Allows you to adapt a 3" Pellet Stove outlet to a 4" Pellet Vent Pipe

56" Framing Depth

as well as a 0-10 VDC signal that can be used to control 3-phase fans by a variable frequency drive

and an on/off remote for convenient control

DuraVent FasNSeal 6" 29-4C Stainless Steel Test Port w68.8125 Each lava rock measures approximatelyAll FasNSeal (single wall) vent lengths and components feature patented built in mechanical locking band and triple lipped directional gaskets. All pipes and components are engineered with smooth clean welds located 90 from mechanical locking bands. This construction feature allows for ease of installation. The air space between the inner and outer wall on FasNSeal W2 helps to reduce the clearance to combustibles in addition to creating a heat shield