Open / Closed ........ depends on your point of reference ....... sure .
When the exhaust is directed to heat the base if the intake manifold , the flap is closed to the exh. ... or ... open to the manifold ........... same action .
When the exhaust is not directed to heat the manifold , the flap is open to the exhaust ... or .. closed to the manifold ...........
Clear as mud , eh .
