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Rooftop duct supports

Rooftop Duct Supports

Galvanized steel H-frame stands for rooftop ductwork, pipes, RTU units, condensers, and cable trays. Standard sizes ship fast — or specify a custom solution for your project.

Hot-dip galvanized steel 20-year limited warranty Seismic & wind options Made in the USA
Standard Duct Supports (aka Mighty H-Frame)
Single-tier frame supports in 16 standard models. Available in 18", 24", 36", and 48" widths with adjustable height — minimum 12.5" off roof.
Width (A): 18", 24", 36", or 48"  |  Height (B): Adjustable, min 12.5" off roof  |  Custom sizes available on request
MIRO H-Frame standard duct support diagram showing A width and B height dimensions
9×15 base — 600 lbs. uniform load 16×18 base — 1,000 lbs. uniform load
Model A (width) B (height) Base
H-1818-V18"18"9×15
H-1824-V18"24"9×15
H-1836-V18"36"9×15
H-1848-V18"48"9×15
H-2418-V24"18"9×15
H-2424-V24"24"9×15
H-2436-V24"36"9×15
H-2448-V24"48"9×15
H-3618-V36"18"16×18
H-3624-V36"24"16×18
H-3636-V36"36"16×18
H-3648-V36"48"16×18
H-4818-V48"18"16×18
H-4824-V48"24"16×18
H-4836-V48"36"16×18
H-4848-V48"48"16×18
Need more than a standard H-Frame?
The 6-DS, 8-DS, and 10-DS are custom-engineered supports sized by base footprint — designed for larger loads, multiple tiers, enclosed duct, or other configurations where a standard single-tier H-Frame isn't the right fit.
MIRO 6-DS custom duct support
6-DS
Smaller base — for lighter duct loads and tighter rooftop layouts.
MIRO 8-DS custom duct support
8-DS
Mid-range base for moderate duct loads.
MIRO 10-DS custom duct support
10-DS
Largest base — for heavy duct loads and demanding rooftop conditions.

Available configurations

Custom duct supports can be built in a range of configurations — including multi-tier, enclosed, third leg, and seismic/wind-rated options.

Single tier duct support configuration
Single tier Standard single-level frame.
Multi tier duct support configuration
Multi tier Stacked for parallel duct runs.
Enclosed duct support configuration
Enclosed Fully framed surround.
Third leg duct support configuration
Third leg Added stability on long spans.
Seismic and wind rated duct support
Seismic & wind Engineered to local codes.
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Not sure which option fits your project? MIRO can provide layout, design, consultation, and engineering support for any rooftop duct application. Request a quote or call 1-800-768-6978.

Why MIRO

MIRO Duct Supports: Reliable Solutions for Rooftop Ductwork

At MIRO Industries, we specialize in high-quality duct supports designed to ensure the stability and longevity of your rooftop duct systems. Our solutions cater to various duct sizes and configurations, making installation efficient and cost-effective.

Key features

Versatile design Accommodates square and round ductwork with vertical and horizontal adjustability to fit your project requirements.
Durable materials Hot-dip galvanized steel or stainless steel construction built to withstand harsh rooftop conditions for long-lasting performance.
Easy installation Includes all necessary hardware and brackets, simplifying the installation process and reducing labor costs.
Custom solutions The 6-DS, 8-DS, and 10-DS models are tailored to your project specifications for applications beyond the standard H-Frame.
Seismic & wind compliance Engineered to meet local seismic and wind uplift codes for code-compliant rooftop installations.

Why choose MIRO

Cost-effective Designed to save time and money with easy installation and minimal maintenance requirements over the life of the system.
Expert support MIRO's team provides technical assistance, layout consultation, and engineering resources to ensure you select the right solution.
Proven performance Trusted by contractors and engineers across the country for over 40 years of rooftop support applications.