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If your soffits are 2' deep from house to fascia, you are probably fine, giving you 4.68 NFVA per foot times two = 9.36NFVA.
http://files.buildsite.com/dbderived-f/owenscorning/derived_files/derived92755.pdf
That, plus the other side balance to the ridge vent exhaust NFVA. Personally, I would trust a continuous soffit vent located near the fascia board for better intake and no house pressure: pp.616: http://books.google.com/books?id=Z8...page&q=attic airflow with gable vents&f=false
If only 11", you are getting about 4 NFVA, or 1/2 as much as you need.......
Gary
If your soffits are 2' deep from house to fascia, you are probably fine, giving you 4.68 NFVA per foot times two = 9.36NFVA.
http://files.buildsite.com/dbderived-f/owenscorning/derived_files/derived92755.pdf
That, plus the other side balance to the ridge vent exhaust NFVA. Personally, I would trust a continuous soffit vent located near the fascia board for better intake and no house pressure: pp.616: http://books.google.com/books?id=Z8...page&q=attic airflow with gable vents&f=false
If only 11", you are getting about 4 NFVA, or 1/2 as much as you need.......
Gary