There are different structures of chimneys that we can see on the rooftop. These chimneys provide ventilation for hot flue gases or smoke from a boiler, stove, furnace or fireplace to the outside. Big holes remain open so all the rain, hail or dust will go straight into the home. The heat escaping out the chimney top make the birds sit upon because it is relatively warm. These must be closed and the reason why every single one of them needs Chimella Umbrella.