Old Heating equipment, floor tiles, older roofing products. There is a ton of products that used asbestos back in the day. Africa still uses asbestos products for home building. It's only a problem if it becomes friable and air borne. If it's in a solid product, it's best not to disturb it. Like floor tiles, if you tear them up the asbestos becomes airborne, so you need to be careful with removing them. Professional asbestos abatement costs a shit ton of money.