Fire-Rated Shaft Doors & Utility Riser Access Panels
Heavy-duty galvanized steel shaft access doors designed for electrical ducts, plumbing risers, and utility shafts. Engineered to provide secure access, vertical fire compartmentalization, and clean architectural corridor integration.
Key Features of Dorprime Shaft Doors
Manufactured using high-grade GI steel and premium hardware to deliver secure access, long life, and zero maintenance in high-rise buildings.
Durable Steel Construction
Manufactured using prime high-grade galvanized steel sheets, delivering structural strength, impact resistance, and long-lasting performance in utility shafts.
Smooth & Reliable Operation
Engineered with precision flush hinges and secure cam latch / master keyed cylinder locks to provide effortless access for maintenance technicians.
Low Maintenance Design
Finished with pure polyester electrostatic powder coating that resists humidity, condensation, and mechanical wear in confined plumbing and riser areas.
Vertical Fire Compartmentalization
Stops vertical chimney-effect spread of fire, toxic fumes, and smoke through building utility risers, isolating electrical and plumbing accidents.
Types of Steel Shaft Doors
Fabricated in standard modular dimensions as well as custom architectural sizes for all utility openings.
Single Leaf Shaft Access Door
Compact, flush-mounting steel access door designed for electrical distribution boards, telecom shafts, plumbing risers, and meter cupboards in corridor walls.
Technical Highlights:
- Sheet: 0.8mm – 1.2mm GI Sheet
- Lock: Cam Lock / Square Key / Cylinder
- Frame: 90mm X 45mm Rebated Profile
- Rating: Up to 120 Min Fire Rating
Double Leaf Shaft Access Door
Wide-access double leaf steel door assembly engineered for heavy mechanical risers, multi-cable trays, chilled water pipeline shafts, and industrial maintenance ducts.
Technical Highlights:
- Construction: Double Skin Reinforced Leaf
- Infill: Fire-Resistant Rockwool
- Latching: Two-Point Master Lock System
- Standards: IS 3614 & NBC 2016 Compliant
Engineering Data of Shaft Doors
Conforming to IS 3614:2021, National Building Code (NBC 2016 Part 4), and CPWD standards.
| Parameter / Component | Engineering Specification |
|---|---|
| Material Specification | Galvanized Iron (GI) / Mild Steel (MS) / Stainless Steel 304 |
| Body Sheet Thickness | 0.8mm / 1.0mm / 1.2mm High-Yield Steel |
| Leaf Construction | Single Sheet Folded Box Profile with Internal Stiffeners |
| Frame Section Dimensions | 90mm X 45mm / 100mm X 50mm with Wall Fixing Anchors |
| Protective Surface Coating | Pure Polyester Powder Coated (RAL 7035 Grey, RAL 9010 White, Custom) |
| Locking & Latching | Quarter-turn cam lock with coin slot / square key / master cylinder lock |
| Hinges | Concealed stainless steel pivot hinges / SS butt hinges |
| Optional Vision / Vent Lite | 4mm Float Glass with fire gasket / Louvered ventilation slots |
| Testing & Certification | IS 3614:2021, NBC 2016 Part 4 Life Safety Norms |
Advantages of Dorprime Shaft Doors
Shaft doors are designed to provide secure access, durability, and fire containment for utility and service areas in commercial, residential, and industrial buildings.
Stops Vertical Smoke & Fire Spread
Service shafts act as natural flues in a building fire. Dorprime shaft doors seal off these channels, preventing flashovers from spreading vertically between floors.
Secures High-Voltage Utility Assets
Protects critical electrical busducts, server cables, and plumbing valves against unauthorized interference, accidental vandalism, and rodent damage.
Flush Aesthetic Corridor Integration
Engineered with ultra-slim outer frame flanges that blend seamlessly into plaster, drywall, or tiled corridor surfaces with zero unsightly protrusions.
Rust & Moisture Resistant
Hot-dip galvanized zinc coating combined with electrostatic powder coating protects the steel even in damp plumbing shafts and basement riser environments.
Zero-Hassle Routine Maintenance Access
Technicians can unlock and swing the doors open 180° for fast inspection of electrical meters, circuit breakers, and water shutoff valves without tools.
Complete National Building Code Compliance
Mandatory for high-rise commercial and residential projects under NBC 2016 Part 4 to secure statutory Fire Safety No-Objection Certificates (NOC).
Ideal Applications for Shaft Doors
Widely specified in electrical risers, plumbing chases, fire damper locations, and telecommunication shafts.
Electrical Distribution Shafts
Main LT risers, busduct chases, floor electrical panels, and meter cupboards
Plumbing & Drainage Risers
Water supply risers, drainage piping, pressure reducing stations, and valves
HVAC & Mechanical Ducts
Air conditioning riser inspection openings, damper access, and smoke extract shafts
Telecom & Fiber Optic Risers
Structured cabling shafts, internet distribution points, and CCTV wiring risers
Lift & Elevator Hoistways
Emergency rescue access hatches and hoistway service doors
Basement & Podium Service Corridors
Fire hydrant risers, gas piping inspection doors, and pump room access
Why Contractors & MEP Consultants Choose Dorprime
Dorprime manufactures precision-formed steel shaft doors in customized dimensions to fit exact masonry and drywall openings, cutting on-site installation time and ensuring flawless fire compartmentalization.
Request Technical Proposal for Shaft Doors
Send us your shaft schedule, opening sizes, or project BOQ. Our engineering estimating team will supply dimensional submittals, test certificates, and volume discount pricing within 24 hours.