Question of Existing Floor Penetration 66Tradewind
If the coach has a front mounted fresh water tank, it may be a vent for your furnace. One of the advertising points that Airstream emphasized at the time was that the compartments with holding tanks received "ducted heat".
Kevin D. Allen
WBCCI (Lifetime Member)/VAC/Free Wheelers #6359
1964 Overlander International/1999 GMC K2500 Suburban (7400 VORTEC/4.11 Differentials)
1978 Argosy Minuet 6.0 Metre/1975 Cadillac Eldorado Convertible (8.2 Liter V8/2.70 Final Drive)