Smoke chamber parging before and after. The National Fire Prevention Association 211 states that “the fireplace smoke chamber shall be parge coated smooth with an insulating refractory mortar and not inclined more than 45 degrees from vertical.” Call us at 1-800-257-2066 to have your chimney inspected and cleaned and to make sure your fireplace smoke chamber is up to today’s standards. Parged smoke chambers lead to increased draft, reduced creosote and less fire hazard in your fireplace.