This 48” supply plenum is fabricated from R6 ductboard (Johns Manville Type 800 or equivalent), designed for clean air distribution and fast field installation. Built in-shop to maintain consistent quality and reduce on-site labor, this plenum arrives fully assembled and ready to connect to your system. Features: • 48” length standard plenum • Type 800 R6 ductboard construction • Foil-faced exterior with sealed seams • Lightweight and easy to install • Clean, professional finish Applications: • Air handler supply plenums • Residential and multifamily systems • New construction and retrofit installs Order Instructions: Price shown covers up to size 20x30. We will contact you after your order is placed to go over your order sizes. Need multiple units or custom configurations? 📩 Email your plans — we’ll quote within 24 hours. Contractor-grade fabrication built to save field time