• Mounts in a square cutout and conceals the hole-cut to simplify installation work.
• Cover can be set to open either upward or downward for convenience in confined spaces.
• Enhanced accessories (finger guard, filter, plug cord, mounting screws).
• Optional Replacement Filter and Vent Attachment.
• The lineup includes Single, Double, and Triple Box Fans with eight models with plastic blades and eight models with metal blades.