Yes, i checked that site and even 20 gauge (thinner) seems to be fine for my requirement, in terms decibel loss less than 1 (inauidible). I am planning for 14 gauge (thicker) if branded available. Currently i have 14 gauge only but local brand.
If i remember correct, there was one old post by Keith_correa only, which i had read couple of days back, which was mentioning about gauge and length.