Duralite’s replacement elements for Denver furnaces are fabricated here in the USA. Refer to the drawing to verify that the element details match up to your furnace, if you are ordering for the first time. These elements are not returnable because when they are installed we have no way of knowing if they have been damaged. We can not resell a heating element that has been returned and take the chance we are sending a customer a damaged product. We currently do not carry APM elements. If you do not see your model furnace listed, please contact us. It is very likely we have what you need.