Smaller on each side than the vent you re installing.
Attic vent through soffit.
If you are looking for a diy install roof ventilation is a risky job.
Almost all homes are fitted with some kind of roof vents at the peak of the roofline be it individual roof vents hip roof ventilation and many homes have gable vents as well.
Even for the second story bathroom you can access the attic to vent the moisture outside.
To effectively cool the attic outside air needs to circulate through it.
Add soffit venting first.
Make the vent hole 1 2 in.
Yes you can vent the bathroom fan through soffit.
Space the holes 12 to 14 in.
Instead fresh air still flows in through the soffit vents and travels along the underside of the sheathing until it reaches a ridge vent or can be vented with another type of exhaust vent.
Next lay the strip vent down on a flat wood surface such as a plywood sheet or long 2 x 4 and drill 1 8 in dia.
With the help of an assistant raise the vent up to the soffit and center it over the cutout slot.
This eliminates the need for you to make a hole in the roof or your walls.
Can i vent bathroom fan through soffit.
Mark holes for soffit venting.
Raise the vent up to the soffit photo by merle henkenius.
Butt a cardboard template against the fascia and mark your soffit hole locations to begin soffit vent installation.
One solution is to use the natural circulation caused by hot air rising to bring fresh air into the attic through soffit vents under the eaves then expel the hot air through ridge or gable vents near the peak of the roof.
Vent these fans through the roof or soffit.