<b><b>Is whole house ventilation the way forward for the housebuilding industry? Tim Palmer looks at how developments in this area are tackling new ventilation requirements</b></b><br><b>As buildings become increasingly airtight, current Building Regulations, Part F1 and the imminent Part L, have put greater pressure on manufacturers of &amp;“whole house&amp;” ventilation systems to design products that are both effective and efficient in ventilating buildings in a controlled way. </b><br>Jon Hill, product development manager at Domus Ventilation, says: &amp;“It&amp;’s early days - and the ventilation market will take some time to feel the effects of Part L revisions - but I believe it will bring to the forefront the need for &amp;‘controlled ventilation&amp;’ to combat the increased build-up of indoor pollutants (see box) without large heat losses normally associated with leakage and uncontrolled background found in most current housing stock.&amp;”<p></p><p><b><b>Bigger share</b></b><br>Hill suggests that products previously always available to minority markets such as whole house ventilation with heat recovery will now take a larger share of traditional ventilation sales. &amp;“This will lead to more competitive products being developed by companies currently not in this field. A spin-off will probably be increased sales of low energy extract fans.&amp;”</p><p>Multi-room &amp;“whole house&amp;” extract systems basically consist of …