640 / 641 Series
Standard Features at a Glance

• Available with UL and FM 3-hour Class A labels for masonry fire walls.
• Availble with a UL 1-1/2 hour Class B label for applications in non-masonry fire walls of dry-wall with wood, steel studs, or steel tube jambs.
• NFPA-80 compliant.
• Fusible link separates at 165^oF (74^oC) to automatically close the door.
• Governor controls rate of door descent during a fire.
• Compact box guide design or an attractive appearance.
• Upward-expanding guide design for flush to counterop installation.
• Flat slat curtain design in primed galvanized steel finish (640 Series) or No. 4 stainless steel finish (641 Series).
• Slide bolt locking on push-up/crank.