<?xml version="1.0" encoding="utf-8"?>
	<rss version="2.0">
		<channel>
			<title>Green Building Forum - MHRV external roof vents - spacing</title>
			<lastBuildDate>Thu, 25 Jun 2026 04:00:47 +0100</lastBuildDate>
			<link>https://www.greenbuildingforum.co.uk/newforum/</link>
			<description></description>
			<generator>Lussumo Vanilla 1.0.3</generator>
			<item>
		<title>MHRV external roof vents - spacing</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13328&amp;Focus=223506#Comment_223506</link>
		<guid isPermaLink="false">https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13328&amp;Focus=223506#Comment_223506</guid>
		<pubDate>Wed, 29 Apr 2015 21:21:03 +0100</pubDate>
		<author>splashie</author>
		<description>
			<![CDATA[Hello<br /><br />This might be a bit last min for you guys, but I can find nothing online to help me.<br /><br />Got to put in the MHRV outlet / supply roof vents in tomorrow and it's still unclear if I need to be a certain spacing from a window in the manner you do for a soil pile vent. <br /><br />As far as I can work out my two vents need to be 1m apart edge to edge, and I'm keeping them as far from the soil vent as I can (approx 1.5 or more higher up the roof)<br /><br />If you do have any thoughts or can signpost me to regs feel free to share!<br /><br />many thanks]]>
		</description>
	</item>
	<item>
		<title>MHRV external roof vents - spacing</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13328&amp;Focus=223511#Comment_223511</link>
		<guid isPermaLink="false">https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13328&amp;Focus=223511#Comment_223511</guid>
		<pubDate>Wed, 29 Apr 2015 22:17:14 +0100</pubDate>
		<author>Ed Davies</author>
		<description>
			<![CDATA[Try BRE Digest 398 which has a few paragraphs on vent positioning. It was available online (borpin referenced it a while back) but that copy's gone. Couldn't immediately find another. Don't really want to post the whole thing here as I think you're supposed to pay for it but relevant paragraphs:]]>
		</description>
	</item>
	<item>
		<title>MHRV external roof vents - spacing</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13328&amp;Focus=223519#Comment_223519</link>
		<guid isPermaLink="false">https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13328&amp;Focus=223519#Comment_223519</guid>
		<pubDate>Thu, 30 Apr 2015 00:10:38 +0100</pubDate>
		<author>Gotanewlife</author>
		<description>
			<![CDATA[The contributions previously all said aim for 2m.  I managed 180 odd and I angled my vents at 45 deg away from each other.  1m feels like the minimum I would imagine working without confliction.  My primary point though is don't underestimate the noise the external vents might make.  I didn't put attenuators in mine and on boost they sound like not that far distant jet engines - there is no way you would have an open window near when mine is on boost - just something (else) to think about. <img src="/newforum/extensions/Vanillacons/smilies/standard/wink.gif" alt=":wink:" title=":wink:" />]]>
		</description>
	</item>
	<item>
		<title>MHRV external roof vents - spacing</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13328&amp;Focus=223580#Comment_223580</link>
		<guid isPermaLink="false">https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13328&amp;Focus=223580#Comment_223580</guid>
		<pubDate>Fri, 01 May 2015 10:43:01 +0100</pubDate>
		<author>CWatters</author>
		<description>
			<![CDATA[Make sure the incoming vent is upwind of your boiler flue.]]>
		</description>
	</item>
	
		</channel>
	</rss>