1927 Series 80 Strange Appurtenance Identity

It seems to consist of a sheet-steel box which partially encloses the exhaust and intake manifolds, with an opening just behind the engine fan and an opening in the firewall to allow the engine fan to move air past the exhaust manifold and into the passenger area. The pull knob may be the reason there is an unused hole drilled on my Car’s dash.

Francisco also claimed an advantage to heating the intake manifold in cold weather which is probably somewhat valid in that era, given that there were often connections between the manifolds which the OEM intended for positive effects in cold weather.