head casing
... 门窗压条;护条;护角;焊珠：bead 门窗头框：head casing 门窗配件：door and window accessories ...
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门窗安装后，出现一头高一头低、扇和框的缝隙不均匀现象，有时存在上宽下窄或下宽上窄的问题。
After door window is installed, appear directly tall the aperture of low, fan and casing is inhomogenous phenomenon, exist sometimes on wide below narrow or below wide on narrow issue.
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