Builders Best 111064A Unit Support Box R-8 Insulation 21.25 Inches X 28 Inches X 24 Inches

Product Description

The Builders Best 111064A is a Unit Support Box with R-8 insulation, designed for HVAC air handler and rooftop unit installations. It measures 21.25 inches wide by 28 inches long by 24 inches tall and is built to provide a sturdy, insulated transition between the rooftop unit and the ductwork below. HVAC contractors and sheet metal professionals rely on unit support boxes like this one to create a sealed, thermally efficient connection that reduces energy loss and protects the duct opening from the elements. The 111064A is constructed from 26-gauge hot-dipped galvanized steel meeting ASTM A653 CS Type B standards, which ensures long-term corrosion resistance in rooftop and exterior mechanical applications. The galvanized finish holds up against moisture, UV exposure, and the general wear associated with rooftop installations. All sides of the box are beaded for added structural strength, which helps the unit maintain its shape under the load of mounted HVAC equipment. A 1-inch turned-in flange runs along all sides, and a 1-inch flange is turned up on three sides to allow the installer to specify whether the duct opening falls on the A-width or B-length side. This flexibility makes it easier to match the box to varying equipment layouts in the field. The R-8 insulation is factory-installed using adhesive and stick pins, delivering a consistent thermal barrier that meets modern energy efficiency expectations for commercial and residential rooftop systems. With a weight of 32.2 pounds and a cubic measurement of approximately 8.26 cubic feet, this box is a substantial, job-ready component. It is manufactured in the USA and ships as a single unit. Ideal for rooftop HVAC curb adapters, air handler support applications, and insulated duct transitions.

• 26-gauge hot-dipped galvanized steel construction per ASTM A653 CS Type B for corrosion resistance
• R-8 factory-installed insulation applied with adhesive and stick pins for a secure thermal barrier
• Beaded sides and turned flanges on all edges for structural rigidity and easy field installation

Product Highlights

The Builders Best 111064A Unit Support Box delivers a durable, insulated rooftop HVAC support solution in a job-ready 26-gauge galvanized steel package. Its R-8 insulation, beaded construction, and flexible flange orientation make it a practical choice for commercial and residential rooftop unit installations.

Product Information

Standard Information

• Brand: BUILDERS BEST
• Manufacturer Part Number: 111064A

Technical Specifications

• Width: 21.25 inches
• Length: 28 inches
• Height: 24 inches
• Weight: 32.2 pounds
• Cubic Measurement: 8.2639 cubic feet
• Material: Galvanized Steel
• Gauge: 26 GA
• Insulated: Yes
• Insulation Rating: R-8
• Adjustable: No
• Galvanized Coating: Yes
• Country of Origin: USA
• Unit of Measure: EA