There were 2 versions of these, the Nasco badged (stickered) one has the inlet & outlet at opposite corners & was available with a set of controls in a panel that could be fitted below the radio.
There was also ducting that ran from the heater through the engine bay across the motor to the off side radiator support panel, into which a hole was cut to supply "fresh air" via the ducting to the back of the heater using one of the controls
There are probably pics of this unit fitted in as Alex has mentioned in Accessory of the Week section
Gary
