Trident 4-Inch Blue 50-Foot Polyduct Blower Hose

Engine-room ventilation often needs ducting that can snake around structures without crushing, and this Trident Polyduct hose is made for that work. Its 4-inch inside diameter and blue finish identify a larger blower and HVAC duct run. Heavy-duty polypropylene forms the wall, reinforced by a flexible polypropylene-rod helix.

The Polyduct design is highly compressible and intended to spring back after ordinary crushing or handling pressure. Trident highlights resistance to flex fatigue, tearing, and moisture, all useful in congested bilge or ventilation spaces. Its listed temperature range is -40°F to 225°F when appropriately insulated. The manufacturer also specifies compliance with FMVSS 302 flame-resistance requirements.

The hose is supplied as a 50-foot boxed length. Choose this duct where the blower and ventilation equipment call for a 4-inch inside diameter. Avoid sharp restrictions that would reduce airflow and support the run so it cannot interfere with moving machinery. Find additional flexible ducting and hose in our marine water and bilge hose selection.

• Flexible polypropylene-rod helix resists crushing
• Compressible construction for tight ventilation spaces
• Resistant to repeated flexing, moisture, and tearing
• Manufacturer cites FMVSS 302 flame resistance