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			<title>Green Building Forum - bathroom extractor fan or single MVHR?</title>
			<lastBuildDate>Mon, 27 Jul 2026 06:59:11 +0100</lastBuildDate>
			<link>https://www.greenbuildingforum.co.uk/newforum/</link>
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		<title>bathroom extractor fan or single MVHR?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16898&amp;Focus=286584#Comment_286584</link>
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		<pubDate>Wed, 20 Jan 2021 15:49:10 +0000</pubDate>
		<author>bardo</author>
		<description>
			<![CDATA[Just finished the build of a straw bale home. The external wall is 450cm + double board on board cladding making the duct length around 60cm. Ideally I would go for a single room MVHR extractor unit such as the Vent-Axia Tempra however with a max 45 com the in built ducting is too short. I have installed a 105 (ID) soil pipe though the bathroom wall to connect a standard extractor fan. Two questions. Do you know of a simple MVHR which would work with this set-up? Alternatively if I go for a simple extractor with humidistat/timer can you recommend a back draught unit which works well. If I can't exchange heat then the next best thing is to stop drafts. Cheers!]]>
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		<title>bathroom extractor fan or single MVHR?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16898&amp;Focus=286587#Comment_286587</link>
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		<pubDate>Wed, 20 Jan 2021 16:45:27 +0000</pubDate>
		<author>djh</author>
		<description>
			<![CDATA[This product will handle up to 700 mm wall thickness, but you won't like the diameter <img src="/newforum/extensions/Vanillacons/smilies/standard/cry.gif" alt=":cry:" title=":cry:" /> <img src="/newforum/extensions/Vanillacons/smilies/standard/bigsmile.gif" alt=":bigsmile:" title=":bigsmile:" /><br /><br /><a href="https://www.titon.com/uk/products/ventilation-systems/heat_recovery_mvhr/sr700-single-room-hru/" target="_self" rel="nofollow">https://www.titon.com/uk/products/ventilation-systems/heat_recovery_mvhr/sr700-single-room-hru/</a>]]>
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		<title>bathroom extractor fan or single MVHR?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16898&amp;Focus=286588#Comment_286588</link>
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		<pubDate>Wed, 20 Jan 2021 18:00:21 +0000</pubDate>
		<author>owlman</author>
		<description>
			<![CDATA[Too late for you I guess but I came across this the other day and thought it was interesting.<br /><br /><a href="https://www.ventilation-alnor.co.uk/index/news/industrial-news/hru-wall-wrev-window-reveal-module.html" target="_self" rel="nofollow">https://www.ventilation-alnor.co.uk/index/news/industrial-news/hru-wall-wrev-window-reveal-module.html</a>]]>
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		<title>bathroom extractor fan or single MVHR?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16898&amp;Focus=286589#Comment_286589</link>
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		<pubDate>Wed, 20 Jan 2021 19:01:18 +0000</pubDate>
		<author>WillInAberdeen</author>
		<description>
			<![CDATA[You could look at the push-pull alternating single room mhrvs?  <br />I considered this one but didn't go for it in the end. Can be extended to several metres. It is an extractor fan that stores heat in a ceramic block, then changes direction and sucks air in over the ceramic to recover the heat.<br /><br /><a href="https://www.suedwind.it/en/ambientika-solo/4893273177366-1" target="_self" rel="nofollow">https://www.suedwind.it/en/ambientika-solo/4893273177366-1</a>]]>
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		<title>bathroom extractor fan or single MVHR?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16898&amp;Focus=286590#Comment_286590</link>
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		<pubDate>Wed, 20 Jan 2021 20:17:19 +0000</pubDate>
		<author>Fred56</author>
		<description>
			<![CDATA[That Vent Axia would have been a trip into regret based in our experience. Horrible in every respect. The usual disfunctional Vent Axia humidistat controller and totally unacceptable noise levels. If that thing recovered any heat at all I would be truly amazed. Ludicrous price too.<br />Our unit was in a laundry/drying room. Drying rooms are one of our strange preferences. Perhaps due to staying in so many youth hostels.]]>
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		<title>bathroom extractor fan or single MVHR?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16898&amp;Focus=286617#Comment_286617</link>
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		<pubDate>Thu, 21 Jan 2021 18:46:29 +0000</pubDate>
		<author>lineweight</author>
		<description>
			<![CDATA[<blockquote ><cite >Posted By: djh</cite>This product will handle up to 700 mm wall thickness, but you won't like the diameter<img src="<a href="https:///newforum/extensions/Vanillacons/smilies/standard/cry.gif" target="_blank" rel="nofollow">https:///newforum/extensions/Vanillacons/smilies/standard/cry.gif</a>" alt="<img src="/newforum/extensions/Vanillacons/smilies/standard/cry.gif" alt=":cry:" title=":cry:" />" title="<img src="/newforum/extensions/Vanillacons/smilies/standard/cry.gif" alt=":cry:" title=":cry:" />" ></img><img src="<a href="https:///newforum/extensions/Vanillacons/smilies/standard/bigsmile.gif" target="_blank" rel="nofollow">https:///newforum/extensions/Vanillacons/smilies/standard/bigsmile.gif</a>" alt="<img src="/newforum/extensions/Vanillacons/smilies/standard/bigsmile.gif" alt=":bigsmile:" title=":bigsmile:" />" title="<img src="/newforum/extensions/Vanillacons/smilies/standard/bigsmile.gif" alt=":bigsmile:" title=":bigsmile:" />" ></img><br /><br /><a href="<a href="https://www.titon.com/uk/products/ventilation-systems/heat_recovery_mvhr/sr700-single-room-hru/" target="_blank" rel="nofollow">https://www.titon.com/uk/products/ventilation-systems/heat_recovery_mvhr/sr700-single-room-hru/</a>" rel="nofollow" >https://www.titon.com/uk/products/ventilation-systems/heat_recovery_mvhr/sr700-single-room-hru/</a></blockquote><br /><br />How do these things avoid just sucking back in the stuff they've just blow out? Do they just try and blow out at the top and suck in at the bottom of the grille thing, or something like that?]]>
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		<title>bathroom extractor fan or single MVHR?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16898&amp;Focus=286625#Comment_286625</link>
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		<pubDate>Thu, 21 Jan 2021 22:26:39 +0000</pubDate>
		<author>djh</author>
		<description>
			<![CDATA[<blockquote ><cite >Posted By: lineweight</cite>How do these things avoid just sucking back in the stuff they've just blow out? Do they just try and blow out at the top and suck in at the bottom of the grille thing, or something like that?</blockquote><br />Dunno about that particular model. Some do as you suggest and others do alternate blow and suck down the same pipe but I've never really looked into the subject - give me two separate pipes every time! Others may know more.]]>
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