In a chimney flue, a damper closes off the flue to keep the weather (and birds and other animals) out and warm or cool air in. This is usually done in the summer, but also sometimes in the winter between uses. In some cases, the damper may also be partly closed to help control the rate of combustion.
A little more detail will help us answer your question. If your snacks are pretzels, potato chips, dried fruit or other dry goods, you can take them in your carry-on or checked bag. Snack items that are liquids or gels, like pudding, jello or yogurt, etc., falls under the 3-1-1 rules for liquids for carry-on bags. They can be transported in checked bags.
Learn about rules for knives, dangerous goods, and other carry-on or checked baggage items concerned by many passengers. 1  For passengers flying on a codeshare flight. 2  What you can't carry to the cabin. 3  Carry-on items with restrictions.  What you can't include in checked 1  baggage. Checked items with restrictions.