# US 9,518,422 B2 · Fire door stop system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,422 B2 - Document ID: US9518422B2 - Status: Granted - Kind: B2 - Application number: 14/830,350 - Filed: 2015-08-19 - Published: 2015-12-10 - Granted: 2016-12-13 - Earliest claimed: 2013-03-15 - Applicants: Charles A. Noble, III - Inventors: Charles A. Noble, III - Web page: https://patentgrep.com/patent/US9518422B2 ## CPC - E06B 5/164: {Sealing arrangements between the door or window and its frame, e.g. intumescent seals specially adapted therefor} - E06B 1/70: Sills; Thresholds - E06B 5/161: {Profile members therefor} - E06B 3/88: Edge-protecting devices for door leaves ({astragals for double doors E06B3/365} ; finger guards for doors or windows E06B7/36) - E06B 2001/707: {Thresholds with special provision for insulation} - E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00) ## Abstract A fire door stop system for retrofitting a fire door assembly so as to bring the assembly into compliance with fire safety codes. The fire door stop system has a profile strip includes at least one flange and intumescent seal that is attachable to a fire door frame. The fire door stop system further includes, as needed, edge protectors for a wood fire door, such as a horizontal edge protector, a vertical edge protector, and a bottom-edge extender, and a latch protector. ## Claims ### Claim 1 A fire door stop system used with a fire door assembly that includes a fire door and a fire door frame having a soffit that forms an overlap surface between the fire door and the fire door frame, the fire door stop system configured to remedy non-compliant clearances between the fire door and fire door frame that are not compliant with fire safety standards comprising: a profile strip that is configured to be fastenable to the soffit; and a first seal consisting of an intumescent material sealer to form a first intumescent seal; wherein the profile strip has a first flange that, when fastened to the soffit, extends outward from the soffit so as to form an extended overlap surface between the fire door and the fire door frame, the first flange having a first face surface that faces the fire door; and wherein the first intumescent seal is affixed to the first face surface of the first flange so as to forma first seal against the fire door under non-fire conditions when the fire door is closed. ### Claim 2 (depends on 1) The fire door stop system of claim 1, wherein the soffit has a fire door stop surface against which the fire door closes, wherein the profile strip further comprises a second flange that, when fastened to the soffit, extends inward against the fire door stop surface so as to form a second overlap surface between the fire door and the fire door frame, the second flange having a second face surface that faces the fire door; a second seal consisting of an intumescent material sealer to form a second intumescent seal; and wherein the second intumescent seal is affixed to the second face surface of the second flange so as to form a second seal against the fire door under non-fire conditions when the fire door is closed. ### Claim 3 (depends on 1) The fire door stop system as claimed in claim 1, wherein the profile strip is configured to remedy non-compliant fire doors and fire door frames having clearances greater than 3/16″ for steel doors and greater than ⅛″ for wood doors. ### Claim 4 (depends on 3) The fire door stop system as claimed in claim 3, wherein the fire door stop system is configured to maintain a minimum fire resistance rating with a wood door when subjected to a fire test for at least 90 minutes for temperatures of at least 1700° F. ### Claim 5 (depends on 4) The fire door stop system as claimed in claim 4, wherein the fire door stop system is configured to maintain a minimum fire resistance rating immediately after the fire test under impact, erosion, rapid cooling and thermal shock effects of a stream of water emitted from a hose discharging water from a 1 and ⅛″ tip under pressure to produce a 57.2 lb force for up to a minute. ### Claim 6 (depends on 3) The fire door stop system as claimed in claim 3, wherein the fire door stop system is configured to maintain a minimum fire resistance rating with a steel door when subjected to a fire test for at least 180 minutes for temperatures of at least 1900° F. ### Claim 7 (depends on 6) The fire door stop system as claimed in claim 6, wherein the fire door stop system is configured to maintain a minimum fire resistance rating immediately after the fire test under impact, erosion, rapid cooling and thermal shock effects of a stream of water emitted from a hose discharging water from a 1 and ⅛″ tip under pressure to produce a 57.2 lb force for up to a minute. ### Claim 8 (depends on 1) The fire door stop system as claimed in claim 1, wherein the profile strip is configured to remedy non-compliant fire doors and fire door frames having clearances up to ½″ for steel doors and up to ⅜″ for wood doors. ### Claim 9 (depends on 8) The fire door stop system as claimed in claim 8, wherein the fire door stop system is configured to maintain a minimum fire resistance rating with a wood door when subjected to a fire test for at least 90 minutes for temperatures of at least 1700° F. ### Claim 10 (depends on 9) The fire door stop system as claimed in claim 9, wherein the fire door stop system is configured to maintain a minimum fire resistance rating immediately after the fire test under impact, erosion, rapid cooling and thermal shock effects of a stream of water emitted from a hose discharging water from a 1 and ⅛″ tip under pressure to produce a 57.2 lb force for up to a minute. ### Claim 11 (depends on 8) The fire door stop system as claimed in claim 8, wherein the fire door stop system is configured to maintain a minimum fire resistance rating with a steel door when subjected to a fire test for at least 180 minutes for temperatures of at least 1900° F. ### Claim 12 (depends on 11) The fire door stop system as claimed in claim 11, wherein the fire door stop system is configured to maintain a minimum fire resistance rating immediately after the fire test under impact, erosion, rapid cooling and thermal shock effects of a stream of water emitted from a hose discharging water from a 1 and ⅛″ tip under pressure to produce a 57.2 lb force for up to a minute. ### Claim 13 (depends on 1) The fire door stop system of claim 1, wherein the profile strip is constructed of 22 gauge steel. ### Claim 14 (depends on 1) The fire door stop system of claim 1, further comprising a horizontal edge protector, wherein the fire door has a front face, a rear face, and a horizontal edge face at a top and at a bottom of the fire door, and wherein the horizontal edge protector has a three-sided channel shape that fits over the horizontal edge face and extends a distance onto the front face and the rear face, so as to protect the horizontal edge face at the top and/or the bottom of the fire door. ### Claim 15 (depends on 14) The fire door stop system of claim 14, wherein the horizontal edge protector is a bottom-edge extension that is fastenable to a bottom edge of the fire door and is adjustable in its placement on the bottom edge of the fire door, so as to reduce a gap between the bottom edge of the fire door and a finished floor surface. ### Claim 16 (depends on 15) The fire door stop system as claimed in claim 15, wherein the horizontal edge protector is configured to correct excessive clearances between the bottom edge of the door and the floor of greater than ¾″. ### Claim 17 (depends on 15) The fire door stop system as claimed in claim 15, wherein the horizontal edge protector is configured to correct excessive clearances between the bottom edge of the door and the floor of up to 2″. ### Claim 18 (depends on 1) The fire door stop system of claim 1, further comprising a latch protector that is a steel plate with a cutout dimensioned to accommodate dimensions of a striker plate opening that is provided on a striker plate that is mountable on the fire door frame, wherein the latch protector is mountable between the striker plate and the fire door frame. ### Claim 19 (depends on 1) The fire door stop system of claim 1, further comprising a vertical edge protector, wherein the fire door has a front face, a rear face, and a vertical edge face along each side of the fire door, and wherein the vertical edge protector is wrapped around the vertical edge face of at least one side of the fire door.