Ventilation Accessories

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Residential Use

Essential for optimizing airflow and ensuring the proper fit of various duct sizes.

Commercial Use

Designed to promote clean air, protect the equipment, and promote energy efficiency by preventing clogging.

Product Highlights
  • Square to Round Transition Box

    This versatile box is primarily used to attach a ceiling register to your air supply and can also transition square ducts to round ducts in various applications.

  • Flue Cap – Galvanized

    This cap is designed to cap off or terminate the end of a pipe, offering a solution without a crimp, and is installed over the outside of the pipe. If you need a cap that fits inside the pipe, consider the GP flue plug with crimp.

  • Storm Collar

    Made from heavy-duty 26-gauge galvanized steel and used with metal pipe flashings to prevent water from running down the pipe. It includes an adjustable tab for easy installation and fits single-wall pipe sizes.

HVAC Accessories Installation Tips
  • Proper Placement

    Installation will vary depending on the accessory. FAMCO components are designed for easy integration with existing systems.

  • Accessory Selection

    Choose accessories based on climate, and specific ventilation needs.

  • Professional Installation

    While some accessories may be installed by a homeowner, professional installation is recommended for complex systems or areas with challenging access.

Frequently Asked Questions

What is the primary purpose of HVAC accessories?

HVAC accessories improve the efficiency, functionality, and longevity of heating, ventilation, and air conditioning systems. Products like plug reducers, furnace filter racks, flue plugs, duct increasers, and filters help optimize airflow, reduce energy consumption, and maintain indoor air quality.

How do I choose the right HVAC accessories for my needs?

Choosing the right HVAC accessories involves evaluating the system’s specific requirements. Start by identifying the size and type of the HVAC system to confirm compatibility with accessories like duct increasers or reducers. Consider the indoor air quality needs and select high-efficiency filters to reduce allergens and pollutants. 

What warranty is provided with HVAC accessory?

Our one-year warranty for HVAC accessories offers coverage for manufacturing defects. If you experience any issues or defects with your accessories, reach out to our customer support team for assistance.

Learn More About Our Ventilation Accessories

Ventilation Accessories

Building a highly efficient HVAC system requires precise connections, clean air management, and durable protective components. FAMCO manufactures premium ventilation accessories engineered to optimize airflow, ensure proper duct sizing, and protect your equipment from moisture and debris. Constructed from heavy-gauge 26-gauge galvanized steel, lightweight aluminum, and durable plastics, our components are designed for seamless integration into residential ductwork, forced intake, and commercial in-line exhaust applications.

Whether you need to buy HVAC accessories online for a bathroom fan, a complex dryer vent route, or a whole-home furnace upgrade, FAMCO provides the essential hardware needed to complete your project with airtight precision. Properly installed accessories help reduce energy consumption, prevent blockages, and maintain superior indoor air quality.

Duct Transitions, Reducers, and Increasers

Navigating complex ductwork layouts often requires seamlessly transitioning between different pipe sizes and profiles. FAMCO offers a comprehensive lineup of airflow management tools, highlighted by our top-rated Square to Round Transition Box—an essential component for attaching a ceiling register to an air supply or adapting square ducts to round pipes.

For connecting different pipe diameters without restricting airflow, our Tapered Duct Reducers, Duct Increaser/Reducers (available in galvanized and aluminum), and Plug Reducers ensure smooth transitions. By minimizing static pressure and eliminating bottlenecks, these components keep your system’s airflow controlled and aligned with exact system requirements, reducing wear on your blower motor.

Weather Protection: Storm Collars, Flue Caps, and Vent Guards

Defending your ventilation system against weather and pests is critical to preventing moisture buildup and system degradation. FAMCO’s heavy-duty Galvanized Storm Collars and B-Vent Storm Collars are designed for use with metal pipe flashings, effectively diverting water away from the pipe and preventing dangerous leaks from running down the roof line.

To securely terminate the end of a pipe, our Galvanized and Aluminum Flue Caps install cleanly over the outside of the pipe. If an internal seal is required, our Flue Plugs with crimps provide a tight, professional closure. For exterior wall exhaust systems, components like the Plastic Wall Vent Guard and heavy-duty Vent Screen (6-inch x 100-foot) actively block pests and debris from clogging your ductwork.

Installation Essentials: Filter Racks, Collars, and Mounts

Achieving a professional-grade finish on your HVAC setup requires the right mounting and maintenance hardware. To ensure external terminations sit flush and secure, FAMCO provides Wall Vent Collars and specialized Stucco Rings for round wall vents. Inside the home, maintaining clean air and protecting your equipment is made easy with our Furnace Filter Racks and Filter Rack Bases, which provide a sturdy, easily accessible housing for regular filter replacements. We also carry essential system hardware like Plumbing Nail Plates, Start Collars, and Damper Motors to fine-tune your in-line systems.

The FAMCO Standard

Rely on FAMCO as your trusted manufacturer for industrial-grade ventilation accessories, ductwork transitions, and weather-protection components. Whether you are installing a square to round transition box for a remodel or sourcing furnace filter racks for a new build, using quality parts is critical for long-term system health. Need technical support matching a duct increaser size, installing a storm collar, or finding the right stucco ring for your exterior wall? Contact our ventilation specialists for expert guidance or request a quote for commercial or residential bulk orders. Upgrading your system with FAMCO HVAC accessories guarantees optimized performance, extended equipment lifespan, and reliable climate control.

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FAMCO HVAC Accessories Benefits

Energy Efficiency
Improves air quality, reduces energy costs, and extends the lifespan of HVAC systems.
Moisture Buildup
Optimizes system performance and efficiency.
Improved Airflow
Keeps the airflow controlled and aligned with system requirements.