internal locking mechanism

A quick learner from New York says:
August 12, 2023
38-149 and 38-150 How do I know which is for right handed open and left handed?
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Jasmine from SWISCO responded:
August 14, 2023

Thanks for writing in! The handing for most Andersen product is usually determined from the outside looking into the home.

If that doesn't help, I would suggest pulling up photos of the images side by side and taking a look at the details of each of the parts in your photo in comparison to your existing tandem lock. For example, in our photos the installation holes on the 38-149 are facing downward, the installation holes on the 38-150 are facing upwards.

Please let me know if you have any questions.
Andersen Tandem Lock, Long
Andersen Tandem Lock, Long
38-150
$23.95
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