Model 1290F is a cheap genuine round fireplace damper created and qualified for place-of-origin fire containment exactly where round ductwork passes as a result of metallic stud drywall partitions or masonry partitions that have a hearth resistance rating of approximately two several hours and making codes demand a fireplace damper. https://heavydutystainlesssteelda89001.ambien-blog.com/43450230/what-does-heavy-duty-stainless-steel-damper-manufacturers-mean