HeyBub wrote:
DerbyDad03 wrote:
I have heard that ridge vents only work well if there are wide
soffits, like 12" or more.

On houses with narrow soffits, box vents are recommended.

Any truth to this?

Basic rule: You can't have too much soffit vents.

At a minimum, you should have one sq ft of soffit vent for each 150 sq ft of
floor space.

(snip)

Obviously this is woefully insufficient for the appropriate amount of
passive ventilation. You'll have to move up a step in addition to ridge
vents. Turbines are the next step and beyond that powered ventilators.

When, if ever, do you need to be concerned about having too much
negative pressure in the attic? You don't want to encourage air to come
up through the ceiling any more than necessary.