E4 | Creosote Removal, Utility Cover | Ask This Old House

Nathan Gilbert heads to Tulsa, Oklahoma to build a replacement utility cover. Ross Trethewey discusses low-level carbon monoxide exposure, symptoms, and differences in CO detectors and low-level monitors. Mark McCullough helps a homeowner clean out creosote build-up in their kitchen fireplace and explains the dangers of creosote build-up, options for removal, and the safety preparation involved.