Supply Plenum R6 16 x 25 x 36

Supply Plenum R6 16 x 25 x 36 is an insulated galvanized-metal 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 supply plenum measures 16 inches by 25 inches by 36 inches. Its R6 insulation helps limit unwanted heat transfer, while the 26-gauge galvanized-metal construction provides strength for professional residential HVAC installations.

Supply Plenum R6 16 x 25 x 36 Features

The Supply Plenum R6 16 x 25 x 36 combines durable metal construction with factory-provided insulation. It is supplied in a knocked-down configuration and must be assembled, secured and sealed during installation.

• 16 x 25 x 36-inch product size
• R6 thermal insulation rating
• 26-gauge metal construction
• Galvanized for additional material protection
• Knocked-down assembly design
• Silver exterior finish
• Non-flanged configuration
• Approximate weight of 21.75 pounds
• Manufactured in the United States

The rectangular configuration provides surfaces for adding compatible supply-air collars and duct takeoffs. The size, number and position of these connections must be determined according to the complete duct-system design.

HVAC Supply-Air Distribution

The Supply Plenum R6 16 x 25 x 36 installs on the supply side of compatible air handlers, evaporator-coil assemblies or furnaces. Conditioned air enters the plenum before being distributed into branch ducts serving different rooms or zones.

A properly sized supply plenum helps distribute airflow without creating unnecessary restrictions. Incorrect dimensions, poorly positioned takeoffs or excessive openings can affect air velocity, static pressure, sound levels and indoor comfort.

The plenum should be selected as part of the complete HVAC air-distribution design. Equipment capacity, blower performance, available static pressure, duct dimensions and required room airflow must all be considered.

Do not select a plenum solely according to HVAC equipment tonnage. Cabinet dimensions and supply-air openings can vary between manufacturers, models and installation orientations.

Installing the Supply Plenum R6 16 x 25 x 36

Before installing the Supply Plenum R6 16 x 25 x 36, confirm the dimensions of the indoor equipment’s supply-air outlet. Verify that the available installation area provides enough space for the 36-inch plenum, duct connections and future equipment service.

Assemble the knocked-down panels carefully and confirm that all corners and seams align properly. The completed plenum should form a stable enclosure without large gaps, loose panels or damaged insulation.

Because this product is not flanged, the installer must use an attachment method suitable for the HVAC equipment and application. A field-fabricated transition may be necessary when the plenum and equipment openings do not match exactly.

Position the plenum squarely with the equipment outlet and support it adequately. The plenum and connected ductwork should not place excessive weight or stress on the air handler, coil cabinet or furnace.

Benefits of R6 Insulation

The R6 insulation incorporated into the Supply Plenum R6 16 x 25 x 36 helps slow heat transfer between the conditioned air and the surrounding installation space.

This thermal protection is beneficial when the plenum is installed in an attic, garage, mechanical room or another unconditioned location. Limiting heat gain or loss helps preserve the temperature of the air leaving the HVAC equipment.

Insulation can also help control exterior condensation when cold supply air passes through a warm and humid environment. However, the vapor barrier, panel seams, equipment connection and duct penetrations must remain properly sealed.

Energy-code requirements can vary according to location. Confirm that R6 insulation is appropriate for the building, climate and installation area before completing the project.

Adding Supply Duct Connections

Plan the size and position of all supply-air takeoffs before cutting openings in the Supply Plenum R6 16 x 25 x 36. Avoid damaging the internal insulation or cutting too close to panel seams and equipment connections.

Remove sharp edges and loose fragments after creating each opening. Secure every collar mechanically and seal its complete perimeter using HVAC-approved mastic, sealant or tape.

When connecting insulated flexible duct, secure and seal the inner liner first. Restore the insulation and exterior vapor barrier around the connection to reduce air leakage, heat transfer and condensation.

Avoid compressing, twisting or sharply bending flexible duct near the plenum. These conditions can increase airflow resistance. Rigid ductwork should remain correctly aligned and independently supported.

Sealing the Plenum

All panel joints, seams and penetrations must be sealed after assembly. Conditioned air escaping from the supply plenum can reduce the amount of heating or cooling delivered to occupied rooms.

Use products specifically approved for HVAC duct systems. Ordinary cloth-backed utility tape should not be considered a permanent method for sealing plenum seams or duct connections.

Inspect the insulation and vapor barrier after completing the installation. Repair tears, exposed edges or openings around the duct takeoffs using compatible materials.

Product Specifications

• Product type: Insulated supply-air plenum
• Size: 16 x 25 x 36 inches
• Material: Metal
• Gauge: 26 GA
• Galvanized: Yes
• Insulated: Yes
• Insulation rating: R6
• Color: Silver
• Flanged: No
• Approximate weight: 21.75 pounds
• Country of origin: United States

Confirming Equipment Compatibility

Measure the equipment outlet before purchasing the Supply Plenum R6 16 x 25 x 36. The listed dimensions should match the intended connection or be accommodated with a properly designed transition.

Consider nearby framing, wiring, refrigerant piping, drain lines and service panels. The installation must not obstruct access required for equipment inspection or maintenance.

Field transitions should preserve sufficient airflow area and avoid abrupt restrictions. A qualified technician can determine the correct design when the equipment and plenum openings differ.

An HVAC contractor should evaluate the entire duct system and verify static pressure after installation. Proper airflow cannot be determined from the plenum dimensions alone.

Inspection and Maintenance

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

Rattling or whistling may indicate a loose panel, open connection or airflow restriction. These conditions should be corrected promptly to protect system performance and indoor comfort.

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

Professional Installation Recommended

Supply Plenum R6 16 x 25 x 36 should be assembled and installed by a qualified HVAC professional. Proper sizing, support, sealing and insulation continuity are necessary for dependable performance.

This product includes the supply plenum only. Collars, ductwork, transitions, 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.