Builders Best 111381a Wide Mouth Vent Hood Bird Guard 4x11

Product Description

The BUILDERS BEST 111381a is a plastic wide mouth vent hood with an integrated bird guard, designed for exterior wall terminations on residential ventilation systems. The hood ships fully assembled at 11 inches overall length and fits a 4-inch duct opening. It includes an aluminum trim plate, a riveted tailpipe, and a back-draft flapper to prevent reverse airflow when the system is off. A 0.5-inch by 0.5-inch pest grid provides protection against birds and small rodents. HVAC technicians and general contractors install this hood as the exterior termination point for bathroom exhaust, kitchen exhaust, or fresh-air intake duct runs.

This vent hood is suited for residential applications where a 4-inch round duct penetrates an exterior wall. The wide mouth profile allows for adequate airflow volume at the termination point. The white finish blends with standard exterior trim and siding. Note: this hood is not recommended for dryer exhaust venting. If used in a dryer application, the pest grid must be inspected frequently for lint accumulation, which can create a fire hazard.

Key Features

• Fully assembled at 11 inches overall length — no field assembly required
• Back-draft flapper prevents reverse airflow and air infiltration when system is idle
• Riveted tailpipe construction for secure duct connection
• Aluminum trim plate covers wall penetration at exterior surface
• 0.5-inch by 0.5-inch pest grid snaps in and is removable for cleaning
• White plastic finish suitable for exterior residential applications

Compatibility

Designed as an OEM-style replacement or new-installation vent hood for residential 4-inch exhaust and ventilation duct terminations through exterior walls.

Installation Notes

Installation is typically performed by an HVAC technician or general contractor. Power down or turn off the fan unit at the circuit breaker before connecting ductwork to the tailpipe. Seal the trim plate to the exterior wall surface with an appropriate exterior-grade caulk to prevent water infiltration. The pest grid is removable for periodic cleaning and should be inspected regularly to ensure it is free of debris or lint accumulation.

Technical Specifications

• Duct Diameter: 4 inches
• Overall Assembled Length: 11 inches
• Pest Grid Opening Size: 0.5 inches x 0.5 inches
• Trim Plate Material: Aluminum
• Hood Material: Plastic
• Color: White
• Unit of Measure: Each

Standard Information

• Brand: BUILDERS BEST
• Manufacturer Part Number: 111381a