Pella Avinyl Windows and Doors V784840 - Manual (Page 6)

INSTALLATION INSTRUCTIONS (HEAD EXPANDER)
A. Make a pencil mark
window on the room side edge of each jamb.
B. Install the head expander on the top of the
window frame.
the head as far as it will go.
Note: To determine if the Head Expander is required refer to Step 4B.
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C. Test fit the window into the opening.
3LIDE
D. Drill two 1/16" pilot holes
HOLES
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CLEANING INSTRUCTIONS
2EMOVE
® or Soft scrub ® may be used. Do
NOT
E. Proceed to Step 4D.