15 RECOMMENDED USE OF ACCESSORIES Use a running outlet with gasket and 2 expansion unions for gutter channels shorter than 12 metres that are closed at both ends. Gutter channels in length 12 metres or less do not require being installed using expansion unions since the profile expands only at the ends. In case of gutter channels exceeding 12 metres, use an expansion union and then install one every 8 metres, and two running outlets. Keep inmind that the distance between two drain points should not exceed 24 metres. Installation of considerably long gutter systems usually calls for solutions that on one hand allow improved rainwater drainage and on the other prevent problems due to wide temperature changes that mildly affect PVC expansion. For water to run smoother through the channel and into downpipes, we recommend a slope slightly greater than the 0.33% standard. A gutter channel running around a four-pitch roof requires installing both expansion unions and running outlet with gasket. INSTALLATIONS OF 12 m. OR LESS INSTALLATIONS LONGER THAN 12 m. EXPANSION EXPANSION > 12 mt. max 24 mt. EXPANSION ≤ 12 mt. EXPANSION ≤ 12 mt. EXPANSION
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