| Color | : | Silver / Metallic |
| Core Material | : | Polyester |
| Flame / Smoke Rating | : | Class 1 (25/50) |
| Inside Diameter | : | 4 in |
| Insulated | : | Yes |
| Jacket Material | : | Metalized Polyester |
| Length | : | 25 ft |
| Maximum Air Velocity | : | 4,000 FPM |
| Maximum Working Pressure | : | 6 in w.c. |
| Operating Temperature Rating | : | 0-200 F |
| Package Quantity | : | 1 |
| Product Family | : | MHP-25 Series |
| Product Type | : | Insulated Flexible Duct |
| R-Value | : | 8 |
| Shape | : | Round |
The MHP-25 Series is a UL listed Class 1 flexible air duct designed for supply and return lines in low to medium pressure residential and commercial HVAC systems. It is constructed with a spring steel wire helix, an airtight 2-ply polyester inner core, and high-performance R-8 fiberglass insulation to ensure thermal efficiency.A rugged, 2-ply reinforced metalized polyester vapor barrier surrounds the duct, protecting it from damage and moisture. This flexible duct is engineered for reliable, energy-efficient performance and meets the requirements of NFPA 90A and 90B.