Sierra 116-450-4000G Fibervent Marine Blower Duct Hose 4" x 25'

The Sierra 116-450-4000G is a 4-inch diameter Fibervent blower duct hose sold in a 25-foot length, designed for marine bilge ventilation and air conditioning ducting applications aboard boats and watercraft. Fibervent hose is constructed of vinyl-coated, woven fiberglass with a vinyl-coated helical wire support that allows the duct to flex and route through tight spaces without kinking or collapsing.

Key Features:

• 4" inside diameter with approximately 4-1/4" outside diameter
• 25-foot length — sold as a continuous box quantity
• Vinyl-coated woven fiberglass construction for durability and flexibility
• Vinyl-coated helical wire support maintains shape and enables tight bends
• Smooth inner wall promotes maximum airflow with minimal resistance
• Flame resistant — meets UL 181 Class 1 standard
• Resistant to ozone, UV, and corrosion
• Temperature rated from -40°F to +250°F for A/C ducting use

The Series 450 Fibervent hose is the premium choice for bilge fume venting, engine compartment ventilation, and marine air conditioning duct runs where flame resistance and long-term weather durability are required. Also referenced as Shields Fibervent Series 450.