Vent Through Roof Or Soffit
One of the most used or popular roof vents is a turbine vent that has spinning tops.
Vent through roof or soffit. This reduces the efficiency of the vent and may trap heat or moisture in the elbows. A down through soffit exhaust vent design by leaving warm air in the exhaust duct when the fan is off creates a heat trap that reduces heat loss out of the bathroom through the exhaust fan duct when the fan is off in comparison with up routed vents or even horizontal vents through a gable end wall. Turbine or rotary vents are often seen in industrial buildings commercial spots or restaurants. Steve is on to something importent there.
Smaller on each side than the vent you re installing. Why not run vents through the soffit. Mark holes for soffit venting. If an exhaust vent is too close to an intake some of that moist warm air is headed in to the attic.
They are usually easy to remove and cut holes through. A vent through the roof must terminate a minimum of 6 inches above the roof surface or 6 inches above any anticipated snow accumulation. I am getting a new roof installed and tear off and likely a lot of plywood and am simultaneously getting a new bath vent fan. Not a good thing.
However in order to make the turns necessary to penetrate the ceiling enter the attic and then descend through the soffit ductwork must make some tortuous bends. Vent these fans through the roof or soffit. A soffit vent is a type of roof vent. Add soffit venting first.
Butt a cardboard template against the fascia and mark your soffit hole locations to begin soffit vent installation. When a vent terminates directly below a window door or air intake it must be. For most homes the most popular and a better looking roof vent option is a soffit vent. I have gotten mixed opinions on whether to vent the new fan through the roof or through the soffit eave.
The roof contractor recommends the soffit to minimize protrusions through the roof.