andreas Posted November 14 Share Posted November 14 The extractor fan I have to fit has a 150mm spigot and advises that you must not reduce to 125mm, but you can adapt to 220 x 90mm flat. I don't quite have room to run 150 round ducting, but I could relatively easily run a 220 x 90 flat duct directly through the wall. Is there any issue doing so? The only obstacle I've found so far is that I cannot find any form of external wall vent termination with backdraft flaps for that size flat ducting. I have found a 220 x 90 joiner with damper fitted internally, that would have to be placed in the hole cut in the internal leaf of the wall, then a (very) short bit of duct to the back of a standard double vent airbrick. Any issues with doing that as well? Any other suggestions?! Link to comment Share on other sites More sharing options...
Nickfromwales Posted November 14 Share Posted November 14 46 minutes ago, andreas said: The extractor fan I have to fit has a 150mm spigot and advises that you must not reduce to 125mm, but you can adapt to 220 x 90mm flat. I don't quite have room to run 150 round ducting, but I could relatively easily run a 220 x 90 flat duct directly through the wall. Is there any issue doing so? The only obstacle I've found so far is that I cannot find any form of external wall vent termination with backdraft flaps for that size flat ducting. I have found a 220 x 90 joiner with damper fitted internally, that would have to be placed in the hole cut in the internal leaf of the wall, then a (very) short bit of duct to the back of a standard double vent airbrick. Any issues with doing that as well? Any other suggestions?! That solution is fine, and as long as the joints are glued or taped you’ll not have any issues there. I removed your duplicate post btw Link to comment Share on other sites More sharing options...
andreas Posted November 14 Author Share Posted November 14 59 minutes ago, Nickfromwales said: That solution is fine, and as long as the joints are glued or taped you’ll not have any issues there. I removed your duplicate post btw Thanks Nick, on both counts 1 Link to comment Share on other sites More sharing options...
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