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Dripping Shower Fan / Roof Vent Question
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<blockquote data-quote="ProDave" data-source="post: 293389" data-attributes="member: 6969"><p>Part F seems to be all about ventilation. how much you need for what room etc. These days it seems concerned with heat recovery etc. Clearly it's been updated recently (2010 I believe up here)so for a start I need the older version of part F that was in force when this house was built, not the current version.</p><p></p><p>And even than I can't find any specific guidance on the physical installation of ducting and roof tile vents. About the only bit of "workmanship" guidance is when installing a horizontal run of flexi ducting, not to allow it to droop down otherwise it will fill with condensation.</p><p></p><p>Even on the Vent axia site, I've found their condensation trap (for installation in RIGID ducting not flexi) but no diagrams. they just repeat the same diagram of a droopy horizontal flexi duct (now not to do it)</p><p></p><p>I've spent some time searching and cant find what I want.</p><p></p><p>I could perhaps convert to rigid ducting with the condensation trap, it would still need a bit of flexi at the top as the vent tiles are not exactly directly above each fan, but not far off.</p><p></p><p>[rant]</p><p></p><p>P.S why are these condensation traps so poorly designed? "you will need duct tape" FFS. You don't use duct tape to join proper plumbing pipes, so why is a condensation trap for ducting made to be such a poor fit with no seals?</p><p></p><p>And why does it vent to 20mm pipe? that's not a standard plumbing size is it? so we drain off the condensate with a bit of 20mm PVC conduit. Make sure to solvent weld the bends then to make them watertight.</p><p></p><p>[/rant]</p></blockquote><p></p>
[QUOTE="ProDave, post: 293389, member: 6969"] Part F seems to be all about ventilation. how much you need for what room etc. These days it seems concerned with heat recovery etc. Clearly it's been updated recently (2010 I believe up here)so for a start I need the older version of part F that was in force when this house was built, not the current version. And even than I can't find any specific guidance on the physical installation of ducting and roof tile vents. About the only bit of "workmanship" guidance is when installing a horizontal run of flexi ducting, not to allow it to droop down otherwise it will fill with condensation. Even on the Vent axia site, I've found their condensation trap (for installation in RIGID ducting not flexi) but no diagrams. they just repeat the same diagram of a droopy horizontal flexi duct (now not to do it) I've spent some time searching and cant find what I want. I could perhaps convert to rigid ducting with the condensation trap, it would still need a bit of flexi at the top as the vent tiles are not exactly directly above each fan, but not far off. [rant] P.S why are these condensation traps so poorly designed? "you will need duct tape" FFS. You don't use duct tape to join proper plumbing pipes, so why is a condensation trap for ducting made to be such a poor fit with no seals? And why does it vent to 20mm pipe? that's not a standard plumbing size is it? so we drain off the condensate with a bit of 20mm PVC conduit. Make sure to solvent weld the bends then to make them watertight. [/rant] [/QUOTE]
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