insulates gaps up to 1 inch. • Great Stuff™ Window & Door* — Seals airtight to insulate and reduce drafts, drip-free. When applied properly, won't distort or bow window and door frames. • Great Stuff™ Fireblock* — Seals to impede fire and smoke with less mess.** • Great Stuff™ Big Gap Filler* — Seals gaps up to 3 inches with ...