Low Pressure Air Intake Hoods & Roof Jacks

Premium Low-Pressure Spiral System Components for Seamless Air Intake

At Spiral Manufacturing Co., Inc., we deliver high-quality components tailored for complex air handling applications in commercial and industrial settings. Among our specialty products, our low-pressure air intake hoods and roof jacks are precision-designed for efficient airflow without admitting unwanted water, debris, or contaminants. Constructed with premium-grade materials, these components reinforce the structure of low-pressure duct systems while supporting consistent and efficient air distribution.

Developed for Consistent Air Movement

Proper ventilation begins at the system’s exterior, and our low-pressure air intake hoods are built to provide optimal outdoor air capture with minimal resistance. Whether installed on rooftops or wall-mounted configurations, these hoods offer dependable airflow control while effectively shielding internal ductwork from environmental exposure. Their sloped design and built-in screens help mitigate the entry of rain, birds, and insects, preserving the longevity and cleanliness of the ventilation system. Our low-pressure air roof jacks complement these systems by providing secure, watertight rooftop penetrations for spiral piping and ductwork. Designed to support low-pressure air movement, these roof jacks serve as critical connection points, ensuring a smooth transition between the exterior and interior duct systems. The result is improved air handling performance with minimized risk of leakage or structural compromise.

Low Pressure Fittings for Residential and Light Commercial HVAC Applications

Air Intake Hood

L=10″ standard, H=D+3, W=D+4.

Roof Jack

Roof Jacks are spot welded and soldered. L=11″ Standard. Plate size = D2+9

Air Intake Hood
D	Opening	Gauge	Part #
3	5×2	30	2-03643
4	6×3	30	2-04643
5	7×3	30	2-05643
6	8×4	30	2-06643
7	9×5 1/2	30	2-07643
8	10×5	30	2-08643
9	11×6	26	2-09643
10	12×6 1/2	26	2-10643
11	13×7 3/10	26	2-11643
12	14×8	26	2-12643
14	16×9 3/5	26	2-14643
16	18×11	26	2-16643
18	20×13	24	2-18643
20	22×14	24	2-20643
22	24×16	24	2-22643
24	26×17 1/2	24	2-24643

Air intake hoods all come standard with 1/4″ bird screen attached and a 1″ mounting flange around top and sides. Other sizes available.

*Roof Jack*
D	D₂	Gauge	Part #
3	6	26	2-0375
4	7	26	2-0475
5	8	26	2-0575
6	9	26	2-0675
7	10	26	2-0775
8	11	26	2-0875
9	12	26	2-0975
10	13	26	2-1075
11	14	26	2-1175
12	15	26	2-1275
14	17	24	2-1475
16	19	24	2-1675
18	21	24	2-1875
20	23	24	2-2075
22	25	24	2-2275
24	27	24	2-2475

Other sizes and roof pitch are available.

Perfectly Aligned with Low-Velocity Duct Configurations

Each intake hood and roof jack we manufacture is carefully designed for seamless integration with low-pressure spiral pipe and duct systems. We fabricate these components from galvanized steel or aluminum to ensure lasting durability, corrosion resistance, and a clean, professional finish that performs reliably in both indoor and outdoor environments. To meet a wide range of project requirements, we offer custom sizing and optional accessories that allow for flexible, job-specific solutions. When paired with our full line of low-pressure fittings, these products form the core of a high-quality ventilation system engineered for long-term performance and minimal maintenance. The result is a balanced and efficient airflow solution capable of meeting complex architectural and mechanical demands.

Precision Fabrication with Dependable Performance

Our strength lies in producing reliable, purpose-built products that deliver measurable results. Our low-pressure air intake hoods and roof jacks are manufactured under strict quality controls, ensuring that each unit meets exacting dimensional and performance standards. Installers and system designers can rely on our products for consistent performance, ease of integration, and lasting durability across a wide range of HVAC applications.

These solutions are widely used in:

Features include:

Commercial ventilation systems
Industrial exhaust and intake systems
Energy recovery ventilation
Rooftop HVAC integrations

By combining form, function, and fabrication excellence, we support system performance from the first air intake to the final exhaust.

Comprehensive Support for System Integration

We understand the importance of product compatibility, design flexibility, and on-site efficiency. Our team works with engineers, contractors, and HVAC professionals to deliver not only products but complete solutions that meet building codes and system demands. With fast turnaround times and custom fabrication options, we ensure your systems are delivered on spec and schedule. From the intake hood to the final connection, every component plays a role in protecting system integrity and maintaining airflow balance. That’s why we manufacture each piece with the result in mind—providing dependable, high-quality components that support your project’s success.

Supporting Ventilation Systems with Proven Product Reliability

Spiral Manufacturing Co., Inc. is dedicated to providing high-quality ventilation components engineered for performance, reliability, and lasting value. Our low-pressure air intake hoods and roof jacks are precision-built to integrate seamlessly with your low-pressure duct systems, ensuring maximum efficiency and weather resistance. With decades of manufacturing expertise, we deliver solutions that not only meet functional requirements but also enhance system durability and airflow consistency.