Lomanco 904W Adjustable Roof Louver Vent Aluminum

Product Description

The LOMANCO 904W is a white, variable-pitch adjustable roof louver vent designed for residential attic ventilation applications. Built from aluminum construction with a perma-coated finish, it accommodates a wide range of roof pitches from 2.5/12 to 9/12, making it suitable for low-slope and moderate-slope roofs without requiring separate pitch-specific units. The unit features pivoting blades that redirect wind-driven rain and debris away from the attic opening, providing reliable weather protection year-round. A 1.5-inch-wide mounting flange secures the unit firmly to the roof deck, and the 8-inch by 8-inch perma-coated screen prevents pest and debris entry. The frame length adjusts from 34 inches to 41.625 inches to fit varying rafter bay configurations.

The 904W is suited for residential attic ventilation where a single adjustable vent must serve multiple roof pitch conditions. It is commonly installed during new construction and re-roofing projects. Roofing contractors and general contractors typically install this vent as part of a balanced attic ventilation system, pairing it with soffit or undereave intake vents. Its all-aluminum body resists corrosion in humid and coastal environments.

Key Features

• Adjustable pitch range from 2.5/12 to 9/12 eliminates the need for pitch-specific vent models
• Pivoting blades provide maximum weather protection against wind-driven rain
• Frame adjusts from 34 inches to 41.625 inches to fit varying rafter bay widths
• 8-inch by 8-inch perma-coated aluminum screen resists corrosion and blocks pests
• 1.5-inch-wide mounting flange for secure attachment to roof deck
• White finish integrates with standard residential roofing materials

Compatibility

Designed as an OEM-style replacement or new-installation roof louver vent for residential attic ventilation systems with roof pitches between 2.5/12 and 9/12.

Installation Notes

Roofing contractors install this louver as part of an attic ventilation system in accordance with local building codes and manufacturer guidelines. Before installation, ensure the roof deck opening is cut to the correct dimensions and that the work area is safe to access. Secure the mounting flange to the roof deck with appropriate roofing fasteners and apply roofing sealant around the perimeter to prevent water intrusion. Do not install on roof pitches outside the 2.5/12 to 9/12 rated range.

Technical Specifications

• Construction Material: Aluminum
• Screen Size: 8 inches x 8 inches
• Screen Type: Perma-coated
• Adjustable Frame Length: 34 inches to 41.625 inches
• Roof Pitch Range: 2.5/12 to 9/12
• Mounting Flange Width: 1.5 inches
• Finish Color: White
• Weight: 2.45 pounds
• Package Quantity: 1

Standard Information

• Brand: LOMANCO
• Manufacturer Part Number: 904W