Plenum Boxes — Insulated R6 Fiberglass, Matched to Your Diffusers

Insulated fiberglass plenum boxes designed to pair with Cryptic Air linear slot diffusers. Available for 1-slot, 2-slot, and 3-slot configurations in multiple lengths. Built for proper air distribution, low noise, and easy connection to your existing ductwork. Standard and custom sizes available - ships in 4–8 days.

Need a different size or configuration? Call us at (786)-733-4639 and we'll get it ordered for you.