For meeting edges of pairs, dutch doors, or door and transom doors, a factory installed intumescent seal is required (category G), as noted below. The smoke and draft control gasket and the intumescent seal must be "Listed" for compliance with test procedure UBC Standard 7-2 (97) part 1 & 2. Refer to the gasketing and intumescent manufacturer's installation instructions for frame preparation and application guidelines.

• This category includes doors that do not have intumescent material that is concealed in the stile edges. To meet part 1 of UBC 7-2 (97) the installer must apply a "Listed" intumescent or smoke seal gasketing on both door jambs and header (see drawings A or B). For door and transom assemblies with a transom bar, also apply the "Listed" intumescent or smoke seal gasketing on all edges of the frame around the transom.

• Standard 16 Gauge UL-63 Metal Frames (Category "B" Doors): Install "Listed" smoke seal gasketing on both door jambs and header (see drawings A or B). For door and transom assemblies with a transom bar, also install the "Listed" smoke seal gasketing on all edges of the frame around the transom. Note: This may have already been accomplished on a Category "B" Door.

• Pair with metal edge and astragal set: After installing the metal edge and astragal on the doors, apply "Listed" intumescent seal on one leaf of the pair at the meeting edge (see drawing D). No additional smoke seal gasketing is required at the meeting edge.
• Pair without metal edges: The meeting edge intumescent is installed under Label Service. Apply a strip of "Listed" smoke seal gasketing on one leaf of the pair at the meeting edge (see drawing E).
• Dutch doors and door and transom assemblies without a transom bar: The meeting rail intumescent is installed under Label Service. Where meeting rail intumescent includes a smoke seal, no additional smoke seal gasketing is required at the meeting rails (see drawings F and H). Where meeting rail intumescent does not include a smoke seal, additional "Listed" smoke seal gasketing is also required at the meeting rails (see drawings G and I).

Drawings show example placements of gasketing and sealing systems