Series SQW and DQW Weather-Stripped (Kerf) Frames Ceco Door SQW Weather-Stripped frames provide best draft control available (for energy efficiency), and provides you with a high quality, functional, aesthetically pleasing opening. Made to order profiles Masonry, Precast and Stud application Drywall application for installation Before or after Drywall 18 and 16 gage steel Kerf pocket with compression weatherstrip Fire label: up to three hours(UL10B and UL10C) ~ Underwriters Laboratories(Applied or Embossed) ~ Warnock Hersey(Applied or Embossed) ~ Factory Manual(Applied only) Sizes available: ~ Single rabbet (SRW and DRW) 3-5/8" - 6" depth ~ Double rabbet (SQW and DQW) 5-1/2" - 9" depth