For a long time now i've known about Liniar's Glazing Flipper, basically a trim which attaches to the middle of the profile with a rubber flipper as the name suggests, which creates a barrier to the outer half (where the frame drainage holes are located) and the inner half, and always thought it was such a brilliant idea, since the drainage holes will allow air to move freely around the 5mm gap all around the glazing, bypassing all of that expensive triple glazing, and thats irrespective of whet