Endura Flap Thermo Sash IIIe Installation Instructions Manual Download Page 1

STEP ONE

STEP  TWO

STEP  THREE

STEP  FOUR

Thermo Sash IIIe

Installation Instructions

Congratulations on your purchase of one of the finest 

pet doors made, featuring the exclusive Endura Flap.

TM

Loosen the thumb screws at the end of the sash. This allows the 

spring mechanism to move freely side to side.  

Note

: Re-tighten the thumb screws after step 3.

Cut the foam weather strip with scissors to the length of the sash. 

Peel back the paper on the foam to expose the adhesive. Install the 

foam strip in the channels on both the top and the bottom of the sash. 

  

PARTS LIST 

1 - Thermo Sash IIIe 
1 - Foam Weather Strip  

      (top and bottom of pet door)
1 - Center Post Weather Seal Strip 

      (vinyl strip)

Insert the sash into the window 

track. Push against the spring 

mechanism and swing the  

opposite end into the opposite 

window track. Gently release. 

Tighten the thumb screws.

Mount the vinyl weather strip. This strip prevents air leaking between 

the window frame. This vinyl weather strip seals the gap produced 

between the two windows when raised to accommodate the sash. 

(Figure A)

Note

: Trim to fit as needed with scissors.

Window Locking options:

   

For a permanent lock, install a wood screw in the track immediately 

above the window on both sides. For a temporary lock, place a  

removable wooden dowel in both tracks above the window.  

(Detail 1)

Thumb 

Screw

Spring Mechanism 

Adjusts side to side

  

Detail 1

Figure A

Foam Weather Strip

Foam Weather Strip

Thumb 

Screw

Spring Mechanism 

Adjusts side to side

  

Detail 1

Figure A

Foam Weather Strip

Foam Weather Strip

Thumb 

Screw

Spring Mechanism 

Adjusts side to side

  

Detail 1

Figure A

Foam Weather Strip

Foam Weather Strip

2

2

1

1

3

3

4

4

These images are representative.   

Appearance of your pet door may 

vary slightly depending on model.

Thumb 

Screw

Spring Mechanism 

Adjusts side to side

  

Detail 1

Figure A

Foam Weather S

trip

Foam Weather S

trip

For expert installation help,  

replacement flaps and parts or 

other quality pet door products, 

visit

 

PetDoors.com

 

or call

 

800-826-2871

Thumb 

Screw

Spring Mechanism 

Adjusts side to side

  

Detail 1

Figure A

Foam Weather Strip

Foam Weather Strip

Endura Flap

 

TM

  

|

  U.S. Pat. No. 7,814,956  

|

  Pat. Pending

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