- Sizes 3", 4", 5", 6", 7", 8", 9", 10", 12", 14", 16", 18" and 20" diameters.
- Length 25' standard
- Available with fittings attached with UL 181-B tape
- Packaged in either corrugated boxes or poly bag
- Surface Burning Characteristics:
- Flame Spread: Less than 25;
- Smoke Developed: Less than 50
- Code Approvals: This product meets or exceeds the requirements of most federal, state, and local codes.
- UL Rated Pressure:
- 3"-20" - Maximum 10" W.C. positive.
- 3"-10" Diameters: 1" W.C. negative;
- 12"-20" Diameters: 1/2" W.C. Negative Although rated higher, we recommend maximum operating pressures at around 6" W.C. Positive
- UL Rated Maximum Air Velocity: 4000 FPM
- UL Rated Operating Temperature: -0°F up to 200°F, -18°C up to 93°C.
- Available with heavier duty vapor barrier for installations in direct sunlight or in outdoor installation (4625UVR)
- Vapor Barrier Permeance Rating: 0.1 (ASTM E96 Method "A")
Flex DuctSystem 4625
System 4625 "Ultra 10" Core and Black Polyethylene Vapor Barrier flexible air duct
Download the current Product Specification Sheet (PDF)
SYSTEM 4625 is a very versatile air duct product capable of performing in a multitude of low to high-pressure residential or commercial HVAC applications. SYSTEM 4625 is well suited for main trunk lines, supply and return lines, connecting lines, as well as runs to diffusers and room registers. As Class 1 air ducts, there are no associated limitations for installed length unless limited by a code body.
System 4625 is constructed around Anco's "ULTRA 10" core. The core is wrapped with a thick blanket of Thermally Certified energy saving insulation. A protective vapor barrier of seamless black polyethylene then covers the core and the insulation. This provides you with a Class 1 Air Duct Material with Certified Thermal R-Values.
Code Approvals: This product meets or exceeds the requirements of most federal, state, and local codes including UL 181; NFPA 90A/90B; HUD/FHA Std 515; Standard Mechanical Code; National Mechanical Code; Uniform Mechanical Code; Florida Energy code; the Cities of Chicago and Yew York, etc. just to name a few. We recommend you always check with your local authorities when in question.
Vapor Barrier: Very durable, puncture resistant black polyethylene vapor barrier that provides improved protection against UV light. Despite the improved UV resistance, we still do not recommend installations in direct sunlight or in outdoor applications. For these applications, we recommend 4625UVR (same specifications as 4625), which uses even a heavier duty black polyethylene vapor barrier or our 5625 product.
