Is this your opinion or do you have hard data to support this? First, please provide the "thin extrusion" data. I'm guessing you have the specs of each manufacturer's extrusion to provide this information. I'm not calling you a liar but I'd like to see it side by side to compare.TheWindowNerd wrote: ↑Sun Mar 27, 2022 7:19 pm 5500 drafty and thin extrusions. Many years ago they were a primary offering for us. We became more concerned with AL, and gladly moved to so much better product.
Second, "Air leakage". I love it when I'm in a home and the potential customer says, "the other guy told me his window has the best air leakage rating out there".
So apples to apples... Do you have the test information available to you by each manufacturer? The test is done by simulating a wind load of 25 mph or 1.57 psf over a period of time and is measured in cfm, correct? Different manufacturers use different size windows for testing. Unless the manufacturers are all using the same size windows, (which they are not) how do you determine who has a better air leakage rating. NFRC doesn't recognize anything below 0.1. So, while a manufacture may post their air leakage results on their website, I haven't seen one post the size of the window used for the test. Different size windows will leak more or less than others. Also, while I agree air infiltration is very important when considering new construction or replacement windows, how often do you have a constant 25 mph wind load against them? You said, "We became more concerned with AL". How are you comparing apples to apples when the window size used for the test is unknown?
I look forward to your response
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