Alpine® Fire-Tite® IMB Insulated Fire Doors
Insulated Fire Safe Door
- IMB roll up insulated fire curtain
- Optional internal flame baffle prevents infiltration through header
- Approved for stainless steel fire doors
- Oversize UL label up to 56′ x 30′
- Fire resistant doors and storm doors are built in accordance with requirements specified by Underwriters Laboratories Inc.
Insulated, Fire Protection.
Insulated Fire Doors have Bottom Bars that can be Galvanized, Stainless Steel, Hot Rolled Steel, Powder Coated, Strip Seal, Pneumatic Edge, Electric Edge, Wireless Edge, Double Angle, Slide Lock.
Fire Door Bracket Plates may be Hot Rolled A36, Stainless Steel, Galvanized, Powder Coated, Viscous Governor, Oscillating Governor, Fire Drop Charge, Charge Wheel, Motor Prep., Chain Gearing, Thru-Wall Drop Plate, Round Bracket, Square Bracket, Hex Bracket, Single Gear Reducer, Double Gear Reducer.
Fire Safe Door Counterbalance Assembly can be Hot Rolled A36, Galvanized, Stainless Steel, Torsion Spring, Kicker, Cycle 17.5M to 400M, Welded Tabs, Taped Holes, Lock Shaft Collar, Keyed, Bolted.
Curtains for the Fire Rated Door can be Galvanized Steel, Stainless Steel, Prime Painted Galvanized, Powder Coated, Stamped Endlock, Cast Endlocks, Windlock Option, Brass End Lock.
Guide Material for Fire Safe Door can be Hot Rolled A36, Stainless Steel, Galvanized Steel, Powder Coated, Structural Angles, Rolled Formed Angles, Weather Stripping, Brush/Smoke Seal, Chain Lock Box, Electric Interlock, Tube Mounting, Pack Out Angle.
The hood/cover for Roll Up Fire Doors can be Galvanized, Stainless Steel, Prime Painted metal, Powder Coated, Flame Baffle, Lintel Seal, Smoke Lintel Seal, Tension Cover, Operator Cover, Back Fascia, Round, Square, Hex, Side End Cap, Motor Cover, T.O.C. Cover, F.O.C.
Cover, F.O.W. Cover.
22 Gauge, 20 Gauge, 18 Gauge.
OPERATION OF DOOR
Fire Rated Door can be Push-Up, Chain, Motor, Hand Crank, Redi-Master, Redi-Lift, Chain Gear Reducer, Redi-Release.
Fire-Tite IMB roll down insulated fire doors are industrial touch. This insulated fire safe door may be interior. Also see our line of exterior fire shutters.
Alpine® Fire-Tite® IMB Rolling Door
Insulated Fire Doors
Below you will find comprehensive drawing details for our fire safe door and insulated fire door featuring important operation details for using hand chain, hand crank, or motor operation. Click here to request a quote. AutoCAD drawings and AutoCAD details may be selected on the CAD FILES option to the right. The AutoCAD drawings and AutoCAD details comply with 08360, 08400 & 08330 construction specs. The drawing details available for Alpine’s rolling door also comprises several mounting options, including face mounted to steel, masonry, or between jamb mounted.
Fire-Tite IMB is an insulated fire door that complies with the 08330 construction spec. This rolling door is built in accordance with requirements specified by Underwriters Laboratories Inc. The Auto Fire-Tite® IMB steel coiling fire door has the same features as the Fire-Tite® IMB with controlled automatic closing by one of Alpine’s Redi-Reset motor, hand chain or crank options. This is a high quality fire safe door that is built for performance.
To download details (PDF), please click below.
The Fire-Tite® IMB AutoCAD drawings and AutoCAD details are for informational purposes. They may change at any time. The CAD detail and CAD drawing reflect the options that are available to the architects and engineers compiling a drawing of an insulated fire door to present to contractors. The AutoCAD detail and AutoCAD drawing will be updated regularly. Alpine’s rolling door is built to last!
Call Alpine today to find the fire safe door that is right for you!
Alpine® Fire-Tite® IMB Fire Rated Door
Insulated Fire Door
The downloadable specifications for Alpine insulated fire doors allow you to provide your own custom specs for fire doors. Click here to request a quote. All options are provided regarding the building and construction of your fire doors. The PDF makes it easy for you to choose the correct options.
To download fire counter shutter specifications please click below.
|Specifications (PDF) Adobe Acrobat|
|Specifications (DOC) Microsoft Word|
Model FIRE-TITE IMB®
Fire-Tite Rolling Doors
NOTE: For fire rated door specifications, architects must choose from a variety of options. The standard choice will be shown first in plain text followed by the options shown in [brackets] (Example “Finish: Galvanized [Powder coated] [Baked enamel]”). The specifier must make the appropriate choices and delete the others (Example: “Finish: Powder coated”).
1.01 SUMMARY OF INSULATED FIRE DOORS
A. This section includes: [Manual] or [Electric] operated, automatic closing, Overhead Rolling Fire Door with 7/8” thick Insulated Metal Backed slats.
1. Provide doors with Underwriter’s Laboratories, Inc. (UL) and Underwriter’s
Laboratories of Canada (ULC) label for the fire rating classification. [4 hr.], [3 hr.], [1 ½ hr.], or [3/4 hr.] Factory Mutual and NYC MEA approved.
2. Cycle life: Design doors of standard construction for normal use of 10,000 cycles standard [up to 400,000 cycles].
3. Manually resettable drop out mechanism with optional release devices. (For
automatically resettable doors see specs for Auto Fire-Tite®)
B. Related Sections: Related to this section, but not limited to, the following (based on MasterFormat 2004):
1. Section 01660 – Product Storage and Handling Requirements.
2. Section 04220 – Concrete Unit Masonry.
3. Section 05120 – Structural Steel.
4. Section 06100 – Rough Carpentry.
5. Section 08310 – Access Doors and Panels.
6. Section 08710 – Door Hardware.
7. Section 09290 – Gypsum Board.
8. Section 09900 – Paints and Coatings.
9. Section 26000 – Electrical.
10. Section 28310 – Fire Detection and Alarm.
1.02 REFERENCES FOR FIRE RATED DOOR
A. ASTM A 653/A 653M – Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process
B. ASTM A 36 – Standard Specification for Carbon Structural Steel, Hot Rolled Steel
C. ASTM A 123 – Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products
D. ASTM A 312 – Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
E. ASTM A 240 – Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
F. ASTM A 276 – Standard Specification for Stainless Steel Bars and Shapes
G. ASTM C 665 – Standard Specification for Mineral-Fiber Blanket Thermal Insulation for Light Frame Construction and Manufactured Housing
H. ASTM E 84 – Standard Test Method for Surface Burning Characteristics of Building Materials
1.03 SUBMITTALS FOR FIRE COUNTER SHUTTER
A. Submit under provisions of Section 01300.
B. Product Data: Provide manufacturer’s standard details and catalog data. Provide installation instructions.
C. Shop Drawings: Furnish shop drawings for architect’s approval. Include elevation, sections, and details indicating dimensions, materials, finishes, conditions for anchorage and support of each door.
D. Submit manufacturer’s recommended operation, troubleshooting, and maintenance instructions.
1.04 QUALITY ASSURANCE FOR INSULATED FIRE DOORS
A. Manufacturer: Rolling doors shall be manufactured by a firm with a minimum of five years experience.
B. Fire-Rated Assemblies: Provide all doors with fire resistance rating required to comply with governing regulations which are inspected, tested, listed and labeled by UL, complying with NFPA 80 for class of opening. Provide UL label permanently fasted to each fire door assembly.
Door shall be tested under UL10B and ULC10B, and provided with a [4 hour] [3 hr.] [1 ½ hr.] [3/4 hr.] rating. Also Factory Mutual and NY MEA approved.
C. Single-Source Responsibility: Manufacturer shall provide doors, tracks, motors, and accessories for each type of door. Secondary components shall come from a source acceptable to the manufacturer of the primary components.
1.05 DELIVERY, STORAGE, AND HANDLING OF FIRED RATED DOOR
A. Deliver materials in original packaging supplied by manufacturer with intact labels. Store materials away from harmful environmental conditions and construction.
1.06 WARRANTY OF FIRE COUNTER SHUTTER
A. Door Warranty: Provide one year written warranty from date of installation against deficiencies due to defects in materials or workmanship. Installer agrees to repair or replace any defects in materials or workmanship.
B. Project Warranty: Refer to Conditions of the Contract for project warranty provisions.
PART 2 – PRODUCTS
2.01 MANUFACTURER OF INSULATED FIRE DOORS
A. Manufacturer: Alpine Overhead Doors, Inc.; 8 Hulse Road Suite 1S, East Setauket, NY 11733. Telephone 800-257-4634 or 631-473-9300. Fax 631-642-0800.
B. Model: FIRE-TITE IMB® Insulated Rolling Fire Door
2.02 MATERIALS FOR FIRE RATED DOOR
1. Slats: Constructed of 7/8” thick interlocking, roll-formed Insulated Metal Backed (IMB) V7 slats. (Slat construction allows for dual coiling flexibility)
a) Slat/Back Cover Material:
i) Galvanized steel, G90 coating exterior (G60 interior), Structural Quality Grade C, as per ASTM A 653/ A 653 M
Finish (Can be different for exterior/interior): Galvanized [Powder coated] [Baked enamel] (Minimum coating conforming with Coating Designation G-01 is
– OR –
ii) ASTM 240 Stainless steel 300 series Finish (Can be different for slat and back
cover): [Mill finish #2B] [#4 satin finish] b) Insulation: Flame retardant fiber and acoustical dampening insulation, ASTM C 665. Surface Burning Characteristics (per ASTM E 84 and UL 723): Flame Spread = 0, Smoke Developed = 0. [Polycrete] i) Thickness: 7/8”
ii) R-Value: 6.21
c) Gauge: (Per manufacturer’s standard)
i) Front slat: Minimum 22 gauge [20, 18, 16 gauge] steel.
ii) Back cover: Minimum 24 gauge [22, 20] steel.
2. Endlocks and Windlocks (as required):
a) Ductile cast iron, hot-dip galvanized endlocks riveted (solid rivets, minimum 3/16” thick) to each end of alternate slats to prevent lateral movement and to limit slat deflection and bending stress. [Windlocks are dependent on windload and increase resistance to curtain jamming] 3. Bottom Bar:
a) Two roll formed galvanized steel [stainless steel] angles, minimum 2” x 2” x 1/8”, which extend into guides, designed to reinforce curtain bottom. (Size dependent on dimensions per manufacturer’s standard)
i) Galvanized Steel as per ASTM A 653/ A 653 M
Finish: Gray shop prime [Powder Coated] [Baked Enamel] – OR –
ii) ASTM 240 Stainless Steel 300 Series
Finish: [Mill finish #2B] [#4 satin finish] B. Guides for Fire Counter Shutter:
1. Guides shall be designed using structural steel angles with a minimum thickness of 3/16”, minimum 1 ¼” slotted connections, and removable bellmouth curtain stops to allow for curtain maintenance without removal of guides. Bellmouth stops shall be flush with guide groove. Guides shall be fastened with minimum 3/8” bolts at minimum 18” o.c.
i) ASTM A 36 Carbon Structural Steel
Finish: Gray shop prime coat [ASTM A 123 Galvanized] [baked enamel paint] [powder coated].
– OR –
ii) ASTM 276 Stainless Steel 300 Series
Finish: [Mill finish #2B] [#4 finish satin] C. Door Support Brackets and Mounting Plates:
1. Steel plate not less than 1/4” thick. Provide ball bearings at rotating support points. Bolt plates to wall mounting angles with minimum 1/2″ fasteners. Plate supports counterbalance assembly and forms end enclosures.
a) Material for Insulated Fire Doors:
i) ASTM A 36 Carbon Steel:
Finish: Gray shop prime coat [ASTM A 123 Galvanized] [Baked enamel paint] [Powder coated].
– OR –
ii) ASTM 240 Stainless Steel 300 Series
Finish: [Mill Finish #2B] D. Counterbalance Assembly: Torsion
1. Counterbalance assembly: Steel pipe barrel of a size capable of carrying a curtain load with a maximum deflection of 0.03” per foot of door width. Heat-treated helical torsion springs encased in a steel pipe and designed to include an overload factor of 25% to ensure minimum effort to operate. Sealed and pre-lubricated high speed ball bearing at rotating support points. Torsion spring charge wheel for applying spring torque and for future adjustments.
a) Material for Fire Rated Door:
i) ASTM A 36 Carbon Structural Steel
Finish: Gray shop prime coat [A 123 Hot-Dip Galvanized] – OR –
ii) A 312 Stainless Steel 300 Series
Finish: Mill finish
b) Life Cycle: High Cycle springs designed to satisfy 10m through 400m life cycles. Consult engineering if height exceeds width for any cycle above 20m. (Cycle defined as one time opening and closing of door)
1. 22 gauge steel. Formed to fit the contour of the end brackets with reinforced top and bottom edges. Provide support bracing for doors wider than 20 feet at every 10 feet to prevent excessive sag. Fasten with minimum ¼” bolts at 10” o.c.
2. Shape: Hexagon [square] [round] 3. Material of Fire Counter Shutter:
a) Galvanized Steel as per ASTM A 653/ A 653 M
i) Finish: [Baked enamel paint] [Powder coated] – OR –
b) ASTM 240 Stainless Steel 300 Series:
i) Finish: [Mill finish #2B] [#4 satin finish] 4. [Fascia]: Galvanized [Stainless Steel], provided where areas behind door hood are open. Materials and finish same as hood.
1. Provide pad-lockable slide locks for latching and locking door on coil side bottom bar at each jamb extending into slots in guides. (Electric Interlocks recommended with motorized doors only)
2. Manual chain hoist: Provide pad-lockable chain keeper on guide.
2.03 OPERATION OF INSULATED FIRE DOORS:
A. Opening/Closing: Manual push-up [Manual hand chain] [Motor Operator].
B. Automatic closure is activated by fusible link [Fire Door Release Device].
C. [Manual hand chain]:
1. Provide chain hoist operator with endless steel chain, chain pocket wheel and guard, geared reduction unit, and chain keeper secured to guide.
D. [Manual hand crank]:
1. Provide crank hoist operator including crank gear box, steel crank drive shaft and geared reduction unit. Fabricate gear box to completely enclose operating mechanism and be oil-tight.
E. [Motor Operators]:
1. Choose ONE:
a) Medium-Duty, Alpine® Model Redi-Hoist™ driven by efficient V-belt primary
drive with chain/sprocket secondary. Maximum ½ hp. For use on doors up to 10’ x10’.
– OR –
b) Industrial-Duty, Alpine® Model Redi-Lift™ driven by heavy-duty V-belt with
chain/sprocket secondary reduction. Optional auxiliary chain hoist. Maximum 1 hp. For use on doors up to 12’ x 12’.
– OR –
c) Heavy Industrial-Duty, Alpine® Model Redi-Master™ driven by heavy-duty worm gear in oil bath reduction. Standard auxiliary chain hoist. Standard ½ hp (maximum 3 hp)
2. [Sensing Edges] (For double angle bottom bar): For motorized doors, sensing edges allow door to go up in case of obstruction. [Pneumatic Edge] [Electric Edge] [Wireless Edge].
a) Colors: Gray [Yellow] [Black] [White] [Yellow with black stripes] F. Release Devices:
1. Fusible link with chain system:
a) Activation: Melting of fusible link at 165° Fahrenheit. When automatic closing is activated, chain shall disengage causing door to close.
b) Closing speed controlled by Integral Oscillating governor [Viscous governor].
c) Average closing speed: No less than 6” per second and not more than 24” per second as per NFPA 80 Section 6, paragraph 4.1.5.
2. [Redi-Release™ Release Devices]: Electric Fail-Safe devices used in conjunction with fusible link. [Smoke detector] Choose ONE from either standard models or SS class:
a) Class 1: Manually operated system that can be tied into most fire alarm systems.
– OR –
b) Class 2: All the features of Class 1, with the additional capability to allow motor operation. If operator is chosen, an electrical edge is recommended.
– OR –
c) Class 3: All the features of Class 2 with the addition of standard Alpine Control Panel and Standard Electric Safety Edge. Allows door to automatically go up in case of an obstruction.
– OR –
d) Class 4: All the features of Class 3 with the addition of the Alpine Uninterrupted Power Supply (Battery backup) that is self-activating during a power outage.
– OR –
e) SS Class Model A: Includes independently adjustable delays of 10 seconds on alarm activations (10 sec. max. adjust) and 10 seconds on power loss (30 sec. max. adjust)
with a hold/release rating of 40 lbs.
f) SS Class Model B: All the features of model A with:
i) The hold open/release device shall recognize that the door is in the closed position and where motor driven, be capable of sensing that power is available to the motor.
The device may be wired to close on alarm.
ii) [Audible and visual annunciators]: To operate during alarm closing cycle.
g) SS Class Model B2: All the features of model B with:
i) 72-hour battery backup with low/no battery logic sounder.
ii) Sounder/Strobe annunciator: To sound during closure due to alarm or power loss.
h) SS Class Model C: All the features of model B2 with:
i) Bottom bar sensing edge.
ii) Remote test plate.
2.04 Mounting of Fire Rated Door:
1. Interior face mounted on prepared opening.
2. Interior mounted between jambs and under lintel in a prepared opening.
3. Exterior face mounted on prepared opening.
2.05 Fire Ratings for Fire Counter Shutter:
1. Underwriter’s Laboratories:
Doors are constructed to conform within requirements specified by Underwriters
Laboratories, Inc. (UL) and Underwriter’s Laboratories of Canada (ULC). Doors are automatic and self-closing, Class (A) (B) (C) (D) or oversized certificate.
4 hour – Approved for doors with openings not exceeding 162 sq. ft. in area.
Class (A) – 3 hour approved for doors in dividing fire walls with openings not exceeding 120 sq. ft. in area
Class (B) – 1 ½ hour approved for doors, in vertical shaft openings not exceeding 120 sq. ft. in area.
Class (C) – ¾ hour approved for doors in corridor or room-partition opening not exceeding 120 sq. ft. in area.
Class (D) – 1 ½ hour approved for doors in exterior wall opening not exceeding 120 sq. ft. in area.
The oversize Certificate is authorized for rolling steel doors for the protection of
openings in fire walls, vertical shafts, and exterior walls where the area exceeds 120 square ft., or for openings in the above locations when width or height exceeds 12 ft. The maximum dimensions for doors for standard fire protection provided with the Oversize Door Certificate are not to exceed 56 ft. in width and 24 ft. in height.
2. Factory Mutual.
3. New York Materials, Equipment and Acceptance Division (MEA).
PART 3 – EXECUTION
E. Verify that dimensions are correct and project conditions are in accordance with manufacturer’s installation instructions; do not proceed with installation until unacceptable conditions have been corrected.
3.04 INSTALLATION OF INSULATED FIRE DOORS
E. Install units in accordance with manufacturer’s instructions.
F. Ensure that units are installed plumb and true, free of warp or twist, and within tolerances specified by manufacturer for smooth operation.
G. Preparation for opening and installation of fire door to be in strict compliance with NPFA-80.
3.05 FIELD TESTING OF FIRE RATED DOOR
E. Test doors for regular operation and automatic closing. Proper authorities having jurisdiction must witness test and sign Drop Test Form.
3.06 DEMONSTRATION OF FIRE COUNTER SHUTTER
E. Instruct the Owner’s personnel in correct operation and maintenance of units.
3.07 ADJUST AND CLEAN
E. Clean units in accordance with manufacturer’s instructions.
F. Restore slight blemishes in finishes in accordance with manufacturer’s instructions to match original finish. Remove and provide new units where repairs are not acceptable to the Architect.
For Use with Fire-Tite®, Fire-Shut® and Fire-Storm® Doors
The Solid State Securities time delay fire door release device is an optional feature for your fire resistant doors. Alpine® Redi-Release® is normally energized as a fail-safe device for fire doors, and incorporates state of the art electronic security control circuitry.
The Redi-Release series release devices are the ideal safety option for fire resistant doors. These devices are able to respond to emergency conditions generated by manual or automatic initiating devices that are normally closed, and are designed to be used in conjunction with a temperature fuse link system. The Test-Release device features include time delay on alarm and power loss, motor voltage sensing, form C output, proximity/door edge input and trouble diagnostic capabilities. Check model label to be installed to verify applicable features.
CAUTION: As with all releasing device systems, maximum fire protection is provided when installed in accordance with factory specifications and used with fuse link systems. Fail-safe operation can only be provided when input power is applied.
For Motorized Doors – Electro-Mechanical Operators
The AFCB fire door release device is designed to be used in conjunction with a standard commercial door operator to provide a fully automated door closing system. For use with motorized doors incorporating a reversing electric safety edge. This 120VAC device can power up to four smoke detectors and two horn/strobes or speaker/strobes. This system combines state-of-the-art functionality and advanced features typically found on special-order fire door operators.
LM21AFCB Owners Manuals
- UL864 Revision 9 compliant
- Programmable DIP switch delay setting – either 10, 20, 30 or 60 seconds delay of door release to permit passage clearance
- Internal battery backup system
- Motor voltage sensing monitors voltage to the operator and activates a mechanical door release upon loss of power to the operator.
- Obstruction cycling – works in conjunction with the door’s electrical safety edge, reversing the door if an obstruction is encountered
- Test keyswitch – permits floor-level testing of the system
- Model LM21AAFCBVB – is equipped with a voice board to broadcast a prerecorded evacuation message
The XP fire door release device provides a fail-safe release mechanism for non-motorized doors and acts as an interface between the door and the fire alarm system. The device required 24VDC power from an approved UL1481 regulated power supply with battery backup, such as a fire alarm control panel. Therefore, installation will require coordination with a fire panel installer.
LM21XP Owners Manuals
- UL864 Revision 9 compliant
- Programmable DIP switch delay setting – either 10, 20, 30 or 60 seconds delay of door release to permit passageway clearance
- Close door detection – prevents door release if the door is kept in the closed position and eliminates door reset service calls or potential system damage
- On board diagnostic – LEDs for early troubleshooting
- Testing function – allows routine fire door testing without requiring activation of the central alarm system; easy reset function returns the device to a standby state
Non-Motorized Doors with Battery Backup Option
Versatility allows the XPBB fire door release device to operate on 120VAC, 24VAC or 24VDC power sources. Internal battery backup allows the release device to stand alone from the fire alarm system and act independently in the event of a power outage. The system can provide 24VDC power for up to four smoke detectors and two horn/strobes, mounted on either side of the door. Programmable delay settings, close door detection, diagnostic LEDs, localized testing, and reset capabilities are also standard.
LM21XPBB Owners Manuals
- UL864 Revision 9 compliant
- Inputs for normally open – 2-wire or 4-wire detectors and 4-wire normally closed detectors
- On board diagnostic – LEDs for early troubleshooting
- Trouble and alarm relays – for communication with the fire alarm control panel, if required
- Audible trouble sounder – to indicate when the release device is not operational
- Testing function – allows routine fire door testing without requiring activation of the smoke detector
- Model LM21XPBBVB – is equipped with a voice board to broadcast a prerecorded voice evacuation message
This fire door 3 Hour approved for insulated fire doors in dividing fire walls with openings not exceeding 152 sq. ft. in area. • 1.5 Hour approved for roll up fire doors in vertical shaft openings not exceeding 152 sq. ft. in area. • .75 Hour approved for exterior fire shutters in corridor or room-partition opening not exceeding 152 sq. ft. in area. • 1.5 Hour approved for fire doors in exterior or interior wall opening not exceeding 152 sq. ft. in area.
Alpine’s insulated fire doors and roll up fire doors are tested and approved for the protection of openings in fire walls, vertical shafts and exterior walls up to 152 sq.ft. with a maximum width or height of up to 13ft 6in. For openings that exceed these limitations, an oversize certificate is available for sizes up to 56′ in width and 30′ in height.
Fire-Tite® IMB fire rated door curtains are fire resistant doors constructed of galvanized steel insulated up to 7/8″ thick slats and can be finished with powder coating or baked enamel finishes. The metal on metal insulated slats have a 7/8″ thick fiberglass fireproof insulation. Each fire door is equipped with a 22 gauge steel hood formed to fit the contour of the end brackets. Durable ductile iron with 1/4″ semi-solid rivets, hot dipped end locks and wind locks are available. Our industrial fire rated door supports and brackets are all steel plates no less than 1/4″ thick. Alpine’s torsion counterbalance assembly for roll up fire doors is state of the art, providing maximum security and ease of use. The fire safe door may be interior mounted.