As the manufacturer of the Ole Hickory Pits smokers, the recommended materials for constructing the 4" or 6" flue pipe as well as the 10" diameter smoke evacuator duct should be made of 16 gauge steel, single wall, with fire wrap insulation applied where this passes through a combustible ceiling.
The 4" or 6" flue pipe should be installed as straight vertically as possible, with any offsets not to exceed 45 degrees. Any offsets that are installed will increase the frequency that the flue needs to be cleaned from at least every six months to every 3 months. Height of the flue pipe should be at least 4' above the roof line and anything within a 10' radius, with a rain cap that flows freely out the sides.
The exhaust fan used with the smoke evacuator should be rated at around 700 CGM for models EL-ES, EL-EC, EL, EL-IB, SSM or SSG. Many customers use a fan from Grainger with their part number 4HZ37.
The exhaust fan should be rated at around 1100 CFM for models EL-ED, EL-EW, SSJ-AE, SSJ, SRO, SSM, SSRD or SSE. Many custmers use a fan from Grainger with their part number 4HZ41.
The electrical power for the exhaust fan should come from the actuator motor electric box on the damper assembly. Connect the black and white wires for the exhaust fan to the screw terminals of the actuator motor, adding the black wire to the black wire and the white wire to the white wire.