I have a question on carb heat. I have two ducts going to carb, one filtered air and one coming from heat muff. So when I select one, it blocks the air from the other. My question is....is it okay to instead of shutting off air from filtered air is it okay to simply route air from heat muff into same duct? In other words when I select carb heat on, just open a heat valve and not stop air from filtered source?

Thanks