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Professional Service
Access Doors & Hardware
Professional Solutions for System Maintenance & Inspection
Diaz Sheet Metal provides a comprehensive range of UL-listed access doors and hardware designed to ensure long-term system integrity and facilitate code-mandated inspections. From liquid-tight grease duct cleanouts to sandwich-style doors for fire damper access, we provide the hardware that keeps your system compliant and accessible.
Our Services
Hinged & Sandwich Styles
Available in hinged designs for rapid access or sandwich styles for high-pressure and fire-rated installations.
UL-Listed Performance
All access components are certified to maintain the fire rating and pressure class of the surrounding duct assembly.
Liquid-Tight Gaskets
Specialized high-temperature ceramic and neoprene gaskets ensure zero leakage in kitchen exhaust and moisture-heavy systems.
Damper Inspection
Strategic placement of access ports specifically designed for NFPA-mandated fire and smoke damper inspections.
Why Choose Diaz Sheet Metal?
Ensures strict compliance with NFPA 96, NFPA 80, and NFPA 105
Available in Flat, Curved, and Double-Wall configurations
Tool-free 'Cam-Lock' and 'Wing-Nut' mechanisms for rapid entry
Corrosion-resistant options: Galvanized, Stainless Steel, and Aluminum
Compatible with both round spiral and rectangular duct systems
Pre-installed shop integration available for 100% fit accuracy
Our Process
1
Compliance Audit
We review your system layout to determine required access locations per local mechanical codes.
2
Component Selection
Choosing the correct door type (Grease, Fire-Rated, or General) based on system application.
3
Precision Integration
CNC-cut openings and reinforced frames ensure the door maintains the duct's structural integrity.
4
System Handover
Final verification that all doors are airtight and accessible for fire marshal inspections.
Frequently Asked Questions
What is a 'Sandwich Style' access door?▼
A sandwich style door uses two metal plates with a layer of insulation and a gasket in between. It 'sandwiches' the duct wall, providing an extremely air-tight and structurally sound seal that is easy to install without tools.
How often are access doors required in a grease duct?▼
Per NFPA 96, access doors must be installed at every change of direction and every 12 feet of horizontal run. They must be large enough (typically 12"x12" or 20"x20") to allow for thorough cleaning and inspection.
Do you offer doors for insulated (double-wall) ductwork?▼
Yes. We provide specialized double-wall access doors that maintain the thermal and acoustic properties of your insulated duct system without creating thermal bridges.
Can these doors be used for fire damper testing?▼
Yes. In fact, many local codes require permanent access doors near every fire and smoke damper to allow for the mandated periodic testing and maintenance. Our doors are ideal for this application.
Ready to Get Started?
Contact us today for a free estimate on your access doors & hardware project.