R6 Insulated Plenum Box - 3-Slot - Fiberglass HVAC Plenum | Cryptic Air

R6 Insulated Plenum Box for 3-Slot (Triple-Slot) Linear Diffusers

Cryptic Air plenum boxes are built to pair seamlessly with our 3-slot linear slot diffusers, delivering optimal airflow performance, quiet operation, and a precise fit while leaving you full flexibility on the job site.

Constructed from R6 fiberglass duct board for excellent insulation, reduced condensation, lower noise, and improved system efficiency.

Why it works:

• Matched to your diffuser. Sized based on your diffuser order, no guesswork at install.
• Flexible duct connection. Cut and install a collar in any size, anywhere on the box.
• Optimized airflow. Maintains proper pressure and even air distribution.
• Quiet operation. Insulated interior reduces turbulence and lowers noise.
• Condensation control. R6 fiberglass reduces sweating and temperature transfer.
• Clean professional install. Front metal lip for secure drywall connection.

Also called a triple-slot diffuser plenum, linear diffuser plenum box, or HVAC supply plenum. Compatible with Cryptic Air 3-slot modern AC vent covers.

Note: Fiberglass material. Use gloves, mask, and proper protection when handling or cutting. May cause skin or respiratory irritation.

• All orders are typically processed and shipped within 4-8 business days from the date of purchase.
• Please note that orders placed on weekends or holidays may be processed on the next business day.