Gravity furnaces are usually just as safe as a standard furnace made today. However, the main cause for concern is the material your gravity furnace is made out of. Most gravity furnaces contain asbestos, primarily in the insulation inside your air ducts, posing a health risk if the asbestos is disrupted. In some instances, you may be able to have the parts containing asbestos removed and replaced, but you will have to hire a specialized technician to perform the job in a manner that effectively and safely removes the asbestos. To learn more about heating systems, contact us today.