Model 1290F is an economical real spherical fire damper made and qualified for level-of-origin fireplace containment where round ductwork passes by metallic stud drywall partitions or masonry partitions that have a fire resistance rating of approximately two several hours and developing codes require a fire damper. Characteristics involve the business https://zanexpcqf.dm-blog.com/37044299/heavy-duty-stainless-steel-damper-manufacturers-no-further-a-mystery