This wire helix product features steel wire support with a multi-ply design of metalized polyester and aluminum/polyester laminate. It is UL 181 listed and labeled as a class 1 air connector.
Builders Best® Foil Duct, 4 in Duct, Round Vent Duct, 50 ft Length, 4 in Diameter, 6 in-WG Positive, 3/4 in-WG Negative, Aluminum/Polyester, Metallic, 5000 fpm Velocity Rating, -20 to 180 deg F, Domestic/Import: Domestic
| Color | : | Metallic |
| Diameter | : | 4 in |
| Domestic/Import | : | Domestic |
| Duct Size | : | 4 in |
| Length | : | 50 ft |
| Material | : | Aluminum/Polyester |
| Pressure Rating | : | 6 in-WG Positive, 3/4 in-WG Negative |
| Temperature Rating | : | -20 to 180 deg F |
| Velocity Rating | : | 5000 fpm |
| Vent Duct Shape | : | Round |
- Designed for low to medium operating pressures in HVAC systems
- Class 1 air connector label meeting NFPA (90A and 90B)
- Tear and puncture-resistant
- Encapsulated wire helix does not unravel when cut to length
- Airtight construction and smooth inner core
- Steel wire support
- Multi-ply design of metalized polyester and aluminum/polyester laminate
- Maximum velocity rating 5000 fpm
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