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Does the 2.5″ opening and bug screen on the siphon reduce the air flow or venting of a 3″ or 4″ stack?

April 26, 2017air bug flow opening reduce screen siphon venting

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Does the 2.5″ opening and bug screen on the siphon reduce the air flow or venting of a 3″ or 4″ stack?

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In a perfect situation with a steady moderate wind coming straight in at 90 degrees to the stack, there would be approximately 10% airflow reduction. Unfortunately, gusts and air turbulence is a lot more common, they do nothing but blow air down the stack. Light winds do basically nothing. With the siphon, all these wind conditions are now drawing up gasses, while inhibiting that odor causing down draft. The airflow gain in an everyday situation outweighs the odd chance of the perfect breeze hitting the stack just at right angle.