Shipping Policies for Premium Ductwork:�� All premium ductwork is subject to a 20% shipping charge with a minimum of $15 shipping charge for all premium ductwork on your order.�� You will be notified by our customer service department of the amount of your shipping.� Note that certain ductwork items are drop shipped from the manufacturer and may not be shipped with the rest of your order.� Because of its large dimensional volume, ductwork cannot be shipped by air.