Suburban Propane Furnace Vents and Snow

This is a question for those with a suburban propane furnace in their Class B who use it where it snows heavy. We just had a really big snow for this area yesterday and today and the Roadtrek is on the driveway to be used as warm, lit shelter should the power go out. Going out after the snow stopped, the outside vent (two holes one above the other) was clear outside but inside the holes there was snow - light powdery snow, but my concern was that should that freeze what would happen if we needed to be using the furnace. My question is once the furnace lights would that just melt away from the heat of the exhaust? Just in case and since there are on and off forecasts of more snow tonight plus freezing temps, I used an artist paint brush to get just about all of the snow out. So for all the snow RVers out there what is your experience? Thanks!