445J is a 4 inch deep fixed-blade (stationary) louver with weather-stopping J blades at 45 degrees. It is ideal for ventilation in self-framing buildings or large openings requiring weather protection. For shallow wall applications, see 245 - 2 inch fixed-blade louver. For modulated airflow applications, see 445A - 4 inch adjustable louver.
Dimensions and weight
- Depth:
- 3.75 inches (95 mm)
- Width:
- Maximum 240 inches (6096 mm) per panel; Larger vents made of multiple panels; Long blades reinforced every 48 inches (1219 mm)
- Height:
- Unlimited; Larger vents can be designed as multiple panels to ease transport and installation
- Weight:
- Approximately 3.7 lbs/sqft (18.3 kg/m2)
Width and height undersized by 1/4" to fit rough openings (unless otherwise specified).
Features and options
Construction
- 0.081 inch (2.06 mm) thick aluminum extrusions
- Blades move on 7/16 inch cadmium plated steel pins in oilite® bushings
- Low Leakage (LL) nylon sideseals between jambs and blade edges
- 1/4" steel rod linkage; steel and bronze brackets
- Assembled with cadmium plated screws and rivets
Frame

- Flange frame (1" frame + 1" flange) for standard building installation
- Channel frame (1") for duct installation (optional)
- Reverse flange (rear flange) frame for surface mount1 or interior installation (optional)
Screen

- 1/4" welded square mesh, 25ga galvanized steel; Fastened on back face
- 1/2" welded square mesh, 21ga galvanized steel (optional)
- 1/8" woven square mesh, 27ga galvanized steel (optional)
- 1/16" nylon insect screen (optional)
Adjustment & locking device
- Manual adjustment with wingnut lock
- Spring and chain for inaccessible installation (optional)
- Motorized operation via long pin or linkage actuator kit (optional)
Linkage and control
- Back-face linkage and control for standard building installation
- Front-face linkage and control for exterior operation (optional)
- Back-face linkage with front-face control for exterior operation (optional)
- Multiple linkages for high velocity applications (optional)