hi there - we have just received a very steep quote for 8" icc pipe (to accompany an RSF Delta 2), but can find [apparently similar] 8" duratech online for half the cost. Your thoughts? What's the actual difference between the two, other than Canadian vs. US? Do you know of icc online retailers who I should visit? The use is for a new home, cathedral ceiling (14'), 5/12 pitch roof at apex. Many thanks!