Three panel glass is three separate panels of glass separated by a spacer. It also about 1" thick! You will know, by looking at the glass itself - thickness and the three glass layers! You have a model number too and if it is a special order then it will have extend numbers. But if it is a regular size window; it should correspond to the windows guide or manual in the back and have "-" for coating types included in the model that you ordered! Other then that; I don't know!

Triple Pane corner cut.

Hello, thx. My question is is there wY to measure the performance at home ?

Are you asking how to measure U-value, SHGC, VT, STC, and so on at home after the windows are installed?

You think they put on fake stickers or messed up? It'll be easy to see if there double pane vs triple, but it will be difficult to see the difference in Low-E and almost impossible to tell argon vs krypton.

I can see double vs triple pane, but how do I know I am getting the LowE I have ordered? Is there a way to measure that at home when they deliver? Sticker looks like any std one any one can put on. There is a cost difference between one lite, 2 lites and 3 litesand also difference in film coatings? Other than trust the sticker( ? ) is there another way to findout whAt you paid is what you are getting?

thx

I am a little concerned that you distrust your contractor this much, like he would switch out stickers or something like that ("Sticker looks like any std one any one can put on"). I pretty much had blind faith in mine. Do you have a reason to believe he might make a mistake, or worse, purposely not provide what you order?

Hi, it is not a question of trust, there are so many options, it could have been done different inspite of good intensions. If some could veryfy on the spot to make sure what you paid is what you got, then the issue goes away. When there are too many involved, it is always better to measure iit not( like measure twice, cut once)

thx

Yeah, this is strange. Why are you asking these questions if he is a competent window installer. He sounds like some guy you picked up off the street in order to save a few bucks. Good luck with that.

maybe your contractor is asking himself if you are going to rip him off and perhaps he is concerned with your credibility.

Hi, all I am asking is a technical question? Is there a way to do that. That is all

thx

You will be able to visually see the difference between low-e and clear glass but it would be a bit more difficult to see or measure the difference between many low-e coatings.

There should be a warranty sticker at the head of the window. You could call the manufacturer with that number and they would be able to tell you the exact glass package ordered. If you your doubts lay with the manufacturer and not the supplier or installer then it gets a bit more difficult.

what glass packackage did you order? What do you think you got? More information usually helps give more informative answers .

You can hold up a match to the window and count the reflections as well. While it has been asked before, I have never heard of a contractor swapping stickers before.

+1. NFRC is pretty strict with labeling. I can't even get a manufacturer to reprint a sticker for me if the customer wants an extra. You can verify that the NFRC sticker corresponds with the warranty/build sticker in the head jamb, and then the visual inspection. None of that is 100% fool proof, however it would take some very shady tactics to screw with that, and get a manufacturer in some serious hot water. Many checks and balances make it a highly unlikely scenario.