Looks like nowhere near enough. I replaced the soffits on my house. The new roof I had when I got the house had a nice ridge vent, but no other vents! I seem to recall that there was a recommended 10% of the square footage of your attic. A quick google search confirms this:
https://www.todayshomeowner.com/adding-soffit-vents/
Quote:
Calculate the total vent area needed: Multiply the length of the attic times the width in feet to find the attic area, then divide by 150 to find the total square feet of vent space needed. [(length x width of attic in feet) ÷ 150 = total sq. ft. vent area]
Example: a 50′ x 30′ attic would have a total area of 1,500 sq. ft., divided by 150 equals 10 sq. ft. of total vent space needed.
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