Lambro Industries 1422BL 4 in Black Plastic Wall Exhaust Vent

Product Description

The LAMBRO INDUSTRIES 1422BL is a 4-inch black plastic single-flap wall exhaust vent designed for through-wall termination of residential dryer and bathroom exhaust systems. The unit features a spring-free, pressure-actuated flap that remains closed when the connected appliance is off, blocking outside air, pests, and debris from entering the duct. When the dryer or bath fan runs, exhaust pressure pushes the flap open to allow airflow to escape. The black plastic construction suits exterior wall installations where a low-profile, weather-resistant termination is needed. Licensed HVAC technicians and plumbers routinely specify this style of wall cap for 4-inch round duct terminations.

The 1422BL is suited for 4-inch exhaust duct systems serving clothes dryers, bathroom exhaust fans, and similar residential ventilation appliances. It is intended for through-wall installation on exterior walls where a single-flap gravity or pressure-activated closure is acceptable per local mechanical code. The black finish is appropriate for installations where color matching to dark trim or siding is a priority. This vent cap is a common choice in residential new construction and retrofit bath-fan or dryer-duct projects.

Key Features

• 4-inch diameter opening matches standard dryer and bath-fan duct sizing
• Single pressure-actuated flap closes automatically when appliance is off
• Black plastic construction resists corrosion on exterior wall surfaces
• Flap seal reduces backdraft, pest entry, and debris infiltration when duct is idle
• Low-profile wall cap design for through-wall exhaust termination

Compatibility

Designed as an OEM-style replacement and new-installation wall cap for 4-inch round exhaust duct systems, including residential clothes dryer venting and bathroom exhaust fan terminations.

Installation Notes

Installation is typically performed by a licensed HVAC technician or plumber in accordance with local mechanical codes and manufacturer instructions. Disconnect power to the dryer or exhaust fan before cutting the wall penetration or connecting ductwork. Seal the perimeter of the wall cap with appropriate exterior-grade caulk to prevent moisture intrusion. Follow local building codes for required duct material, minimum duct length, and termination clearances when completing the installation.

Technical Specifications

• Duct Diameter: 4 inches
• Material: Plastic
• Color: Black
• Product Type: Wall Cap
• Application: Bathroom Venting / Dryer Exhaust

Standard Information

• Brand: LAMBRO INDUSTRIES
• Manufacturer Part Number: 1422BL