Why can an out-of-square opening jam louver blades?

Field answer

Louver frames are usually aluminum and can twist if they are forced into a rough opening. Once the frame racks, adjustable blades, linkage bars, or actuator rods can bind.

Check the opening diagonals, frame squareness, and blade movement. The recovery is to remove the louver, correct the tight masonry or framing points, shim the frame square per the submittal, then fasten without distorting the rails.

What to check first

• Measure the rough opening at top, middle, and bottom.
• Check both diagonals for out-of-square framing.
• Manually test blade operation before final fastening.
• Look for pinched corners or bowed side rails.
• Use approved shims/clearance and do not over-tighten anchors.

Why it matters

A twisted louver frame can jam blades, leak water, and fail commissioning.

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