Supply Plenum R6 16 1/8 x 22 1/8 RP27

Supply Plenum R6 16 1/8 x 22 1/8 RP27 is an insulated steel air-distribution component designed to connect compatible indoor HVAC equipment with the supply duct system. It receives conditioned air from the equipment and provides a chamber for attaching appropriately sized duct branches.

This RP27 plenum features nominal connection dimensions of 16 1/8 inches by 22 1/8 inches. It arrives in a knocked-down configuration for assembly during installation and includes R6 insulation to help reduce unwanted heat transfer.

Supply Plenum R6 16 1/8 x 22 1/8 RP27 Features

The Supply Plenum R6 16 1/8 x 22 1/8 RP27 combines steel construction with factory-provided insulation. Its design supports organized supply-air distribution in compatible residential HVAC installations.

• 16 1/8 x 22 1/8-inch nominal equipment connection
• RP27 product configuration
• Knocked-down design
• R6 insulation rating
• Steel composition
• Silver exterior finish
• Approximate product weight of 23 pounds
• Manufactured in the United States
• Designed for supply-air applications

The knocked-down design can simplify transportation and handling before installation. The plenum must be assembled, secured and sealed correctly to create a dependable air-distribution chamber.

HVAC Supply-Air Distribution

The Supply Plenum R6 16 1/8 x 22 1/8 RP27 installs on the supply side of compatible HVAC equipment. Conditioned air enters the plenum before moving into the branch ducts that deliver heating or cooling to the occupied areas.

A correctly sized supply plenum helps distribute airflow without introducing unnecessary restrictions. The size, number and location of duct takeoffs should be determined according to the required airflow for each room or zone.

Incorrectly placed openings or an undersized plenum can affect static pressure, air velocity, noise and comfort. The complete duct system should be designed according to the HVAC equipment’s airflow requirements and blower performance.

Do not select the plenum based only on equipment tonnage. Cabinet dimensions and supply openings can vary between brands, models and installation orientations.

Installing the Supply Plenum R6 16 1/8 x 22 1/8 RP27

Before installing the Supply Plenum R6 16 1/8 x 22 1/8 RP27, confirm the dimensions of the equipment’s supply opening. Verify that the RP27 configuration is suitable for the intended equipment and available installation space.

Assemble the knocked-down panels according to the appropriate product instructions. All corners, panel joints and seams should fit together securely without large gaps or misalignment.

Position the assembled plenum squarely with the equipment outlet. Use fasteners appropriate for the equipment cabinet and plenum material. The assembly should be adequately supported and should not place unnecessary weight on the air handler, evaporator coil or furnace.

Seal all seams and equipment connections using HVAC-approved mastic, sealant or tape. Proper sealing helps reduce conditioned-air leakage and supports consistent airflow through the intended duct system.

Benefits of R6 Insulation

The R6 insulation incorporated into the Supply Plenum R6 16 1/8 x 22 1/8 RP27 helps slow heat transfer between the conditioned air and surrounding installation space.

This protection is especially helpful when the plenum is installed in an attic, garage, mechanical closet or another area where temperatures may differ significantly from the supply air.

Insulation can also help reduce surface condensation when cold supply air travels through a warm and humid environment. However, seams, penetrations and the exterior vapor barrier must remain properly sealed.

R6 may not satisfy every local energy-code requirement. Confirm the required insulation rating for the building, climate and installation location before purchasing or installing the product.

Adding Supply Duct Connections

The plenum provides surfaces for connecting appropriately sized supply collars or takeoffs. Plan all openings before cutting the steel panels and avoid damaging the internal insulation.

The number and diameter of the takeoffs must be based on the required airflow and duct design. Adding too many openings or positioning them too closely can weaken the plenum and affect air distribution.

After cutting each opening, remove sharp edges and loose fragments. Secure every collar mechanically and seal its complete perimeter with an approved HVAC duct-sealing product.

When connecting flexible duct, fasten and seal the inner liner before restoring the insulation and exterior vapor barrier. Avoid excessive compression, sagging and sharp bends that could restrict airflow.

Product Specifications

• Product type: Insulated supply-air plenum
• Configuration: RP27
• Nominal connection: 16 1/8 x 22 1/8 inches
• Material: Steel
• Color: Silver
• Insulated: Yes
• Insulation rating: R6
• Assembly style: Knocked down
• Approximate weight: 23 pounds
• Country of origin: United States
• Unit of measure: Each

The product listing also shows packaged dimensions of approximately 36.25 inches long, 23.13 inches wide and 3.5 inches high. These measurements reflect the knocked-down package and should not replace verification of the assembled connection dimensions.

Confirming Equipment Compatibility

Measure the actual supply-air outlet before purchasing the Supply Plenum R6 16 1/8 x 22 1/8 RP27. Confirm both dimensions and verify that there is adequate room for assembly, duct connections and future service.

Consider nearby framing, wiring, refrigerant lines, drain piping and equipment access panels. Field transitions may be required when the plenum and equipment openings do not match exactly.

Any transition should maintain sufficient airflow area and avoid abrupt restrictions. A qualified HVAC professional can determine whether the plenum is suitable for the equipment and complete duct design.

Inspection and Maintenance

Inspect the installed plenum during routine HVAC service. Check for loose seams, air leakage, damaged insulation, condensation, vibration and deteriorated seals.

Unusual rattling or whistling may indicate a loose panel, open joint or airflow restriction. Correcting these conditions promptly can help protect system performance and indoor comfort.

Keep the interior free from construction debris and other obstructions. Cleaning procedures should not damage the steel panels, insulation or adjoining HVAC components.

Professional Installation Recommended

Supply Plenum R6 16 1/8 x 22 1/8 RP27 should be assembled and installed by a qualified HVAC professional. Proper sizing, assembly, sealing and support are necessary for reliable performance.

This product includes the knocked-down plenum only. Supply collars, ductwork, fasteners, mastic and other installation materials may be sold separately.

Browse additional sizes in the Xpress Supply Supply Plenum category. For official information regarding stationary air-conditioning equipment and technician requirements, visit the EPA Section 608 refrigeration and air-conditioning resources.