Endura Flap Thermo Sash IIIe Installation Instructions Manual Download Page 2

Installation Tips

Tricks and Work-a-Rounds

I didn’t get a window lock with my Thermo Sash IIIe. 

Locking solutions for sash windows are simple:  If you want to semi-permanently lock the window down 

onto the pet door, insert a wood screw in each window track just above the window. Keep the screw  

heads protruding far enough so that the window can not be opened past them. (shown) If you want to  

keep the window locked but still want to occasionally open it, cut a wooden dowel to the proper length  

and install in the window track just above the window. (shown)

The window turns out to be a little too wide/narrow.

My window turns out to be a little too wide/narrow for the Thermo Sash IIIe to fit in. The Thermo Sash IIIe  

has a built in ‘anti-whoops’ to allow for small measurement errors. If your window is up to 3/4” too wide,  

you can order an extension piece from Patio Pacific, Inc. If the window is up to 3/4” too narrow, you can 

shorten the flanges at the spring end with a hacksaw.

 

My window does not open enough. 

My window won’t raise high enough to accept the pet door. There’s no fix for this  

except to exchange the pet door for a smaller one.

My window track is too narrow to accept the panel.

If your track is wide enough to accept one end but not the other (the spring  

mechanism makes that end about 1/8” thicker than the other end) the solution  

is simple: Just squeeze the flanges together until they fit. Use two 2”x4” boards to 

press the ends together for a neat result. If the track is too narrow for this solution, 

you’ll either have to figure out a way of bracketing the pet door in place or give up.

I want the pet door at the other end.

If you prefer that your pet opening be at the opposite end of the Thermo Sash IIIe, simply remove 

the screws holding the flap/frame assembly, reverse the panel and reinstall the assembly.

 

For expert installation help, replacement flaps and 

parts or other quality pet door products, visit 

PetDoors.com

 

or call

  

800-826-2871

 

(Press 2)

Monday – Friday  

  8:00 

a.m.

 – 4:30 

p.m.

 

PST

Thermo Sash IIIe

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