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445A - 4 Inch Adjustable Louver

Airflow characteristics

  • 44.6% free area for 48"x48" size open to 45°
  • 78.9% free area for 48"x48" size open to 90° (cannot have screen)
  • Maximum recommended intake velocity2 720 FPM

Free area table3 - square feet

Width - inches
12 18 24 30 36 42 48 54 60 72
Height - inches 12 0.17 0.27 0.38 0.48 0.59 0.69 0.80 0.90 1.00 1.21
18 0.40 0.65 0.90 1.14 1.39 1.64 1.89 2.13 2.38 2.88
24 0.66 1.06 1.47 1.87 2.27 2.68 3.08 3.49 3.89 4.70
30 0.91 1.48 2.04 2.60 3.16 3.73 4.29 4.85 5.41 6.54
36 1.09 1.76 2.43 3.09 3.76 4.43 5.10 5.77 6.44 7.78
42 1.28 2.06 2.85 3.63 4.42 5.20 5.99 6.77 7.56 9.13
48 1.52 2.46 3.40 4.33 5.27 6.21 7.14 8.08 9.02 10.89
54 1.71 2.77 3.82 4.88 5.93 6.99 8.04 9.09 10.15 12.26
60 1.96 3.16 4.37 5.57 6.78 7.99 9.19 10.40 11.60 14.01
72 2.40 3.87 5.34 6.82 8.29 9.77 11.24 12.72 14.19 17.14

Product Literature

445A is a 4 inch deep adjustable (operable) louver with weather-stopping J blades. Sideseals on the jambs and weather-lips on each blade minimize water penetration. It is ideal for self-framing buildings or large openings requiring modulated airflow and weather protection. For shallow wall applications, see 245A - 2 inch adjustable louver. For non-modulated airflow, see 445J - 4 inch fixed-blade louver.

Dimensions and weight

Depth:
3.75 inches (95 mm)
Width:
Maximum 48 inches (1219 mm) per panel; Larger vents made of multiple panels
Height:
Maximum 72 inches (1829 mm) per panel; Larger vents made of multiple panels
Weight:
Approximately 3.5 lbs/sqft (17.3 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® bronze bushings
  • Low Leakage (LL) nylon sideseals between jambs and blade edges
  • 1/4" stainless steel linkage rod; Steel and bronze brackets
  • Assembled with cadmium plated screws and rivets

Frame

  • Flange frame (1" flange) for standard building installation
  • Channel frame 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 front 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)
  1. Sleeve or hood (not supplied) is recommended for surface mount.
  2. First point of water penetration, based on tests conducted in our factory on 48"x48" unit.
  3. Free area computed using AMCA guidelines. Screen reduces free area to 83% of shown figures.