Well kinda. But that wan't my point. My contention was that the bottom of the 'turtule' cover is where the opening is-- not the top of the turtle cover. The distance between the bottom of that mechanical vent cover and the top of the vent pips would provide (in my opinion) a significant barrier of ambient air to prevent the drawing of any gasses into the home. There is a considerable 'air' barrier present between the bottom of the turtle vent and the top of the p-vent.

By the way, Warren... was the (mechanical attic) vent working or not? My bet is that if a hurd of grizzley bears broke into the home and ate the a wedding-party's barbecue beans out of the refrigerator, then decided to have a farting contest, the vent would expell the gastrious flatulence and said exuberances would NOT make it back into the attic.

The turtle vent is DESIGNED to assist in deflecting winds and other of natures events. Even if the the 'winds' and events are from an ursus-arse.

JMHO

RR