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Replacement Flap - Thermo Panel & Horizontal Sliding Window Panel

Installation Instructions

Thermo/Quick Panel & Sliding Window

Installation icon Difficulty Easy
Installation icon Steps 11
Installation icon Time Required 0.5 Hours
Installation icon Sections 03
Installation icon Flags 00


  • 1 Replacement Flap
  • 3 Retainer Rings


  • Magnetic Phillips head #2 screwdriver
  • Flat head screwdriver

Step 1 Position the Panel

  • Lay the panel down on its edge, so that you can see the screw holes that are on the sides of the panel.

Step 2 Remove the Bottom Screws

  • Remove the two screws nearest to the bottom of the panel on both sides.

Step 3 Loosen the Second Set of Screws

  • Locate the second set of screws, right under the glass on either side.
  • Loosen each screw a quarter turn.

Step 4 Remove the Flap

  • Slide the flap assembly out of the bottom of the panel.
  • ou may need a soft mallet to knock it loose. If so, it’s easiest to rotate the flap out and tap the bottom magnetic threshold with the mallet.

Step 5 Locate Flap Rod

  • Locate the rod that holds the flap.
  • If you have retainer rings that are holding the rod in place then you can pop one off using the flat head screwdriver.
  • Then slide the rod out and remove the old flap.
  • Slide the rod out and remove the old flap.

Step 6 Check the Magnets

  • Position the new flap in place in the frame and make sure the magnets are attracting correctly. If they are not, try flipping the flap around (switching the interior and exterior faces).

Step 7 Loosen the Bellows

  • Sometimes the bellows (accordion-like sides of the flap) contract during shipping and prevent the magnets from attracting.
  • To fix this, remove the pivot washers from the top corners of the flap and use a blow dryer to lightly heat the bellows and stretch them back out.

Step 8 Position the New Flap

  • Guide the rod through the flap and frame.
  • If you removed a retainer ring, put a new one on by holding the other side of the rod in place while pushing the ring on with your fingers.
  • Each side only needs one ring, and the teeth need to be bent facing away from the flap. If you’re having difficulties putting the new ring on, try flipping the ring around so the teeth are facing the opposite direction.

Step 9 Re-Install Flap Assembly

  • Slide the flap assembly back in place in the bottom of the panel.
  • Be sure that the tracks for the locking cover are on the same side as the height adjustment locks at the top of the panel.

Step 10 Attach Bottom Piece

  • Screw in the bottom piece with the two screws that you removed.

Step 11 Tighten Middle Screws

  • Tighten the screws that are under the glass.