Which GapGuard part fixes which gap?

Per NGP: the GAP90 for head and jamb gaps over 1/8 in, up to 9/16 in; the GAP90-ME for gaps up to 3/8 in at the meeting edge of a pair of doors, along the top or edges of a wood or hollow metal door, or at a hollow metal frame; the 9990 for a head gap up to 1/2 in on doors with parallel arm closers; and the 9590 for a door bottom gap over 3/4 in, up to 1-1/2 in. Each product's rating, door types and installation conditions are in NGP's instructions, and the door's listing and your authority having jurisdiction decide whether a repair is accepted.

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National Guard Products (NGP)

Door Seals & Gasketing

National Guard Products (NGP) is a commercial door hardware company based in Memphis, Tennessee, with a second location in Carson City, Nevada. Its product lines cover door gasketing and seals, automatic door bottoms, thresholds, door edges and astragals, vision lites and louvers, glass, hinges, sliding door hardware, finger guards and flood shields.

GapGuard fire door gap solutions

GapGuard is NGP's line of accessories for fire doors whose clearances have grown past what the door's listing and NFPA 80 allow. NGP says they bring the opening back into compliance without replacing the door or frame. NGP states the GapGuard accessories are certified by UL as positive pressure tested miscellaneous fire door accessories, with ratings that vary by product, up to 180 minutes. See our door seals and gasketing.