How much duct space do you need around the house for an MVHR system?

MVHR with ComfoCool installed in a residential home showing spacing requirements

The most common question I’m asked by people interested in mechanical ventilation with heat recovery (MVHR), low energy building design or Passivhaus is: How much space do we need for the ducts in an MVHR ventilation system? Variations to the… Continue Reading

How airtightness testing differs between Building Regs and Passive House – and why it matters so much

Using a smoke pen to detect leaks during airtightness testing

Building Regulations Part F wants to know how much air (in m3hr) passes through each metre square area of the fabric (m2). This is the Air Permeability (AP or m3.hr/m2) figure of the building. To get the AP figure, one… Continue Reading

The Interim Independent Report following Grenfell savages UK Fire Safety and Building Regulations

Grenfell ruins

Financial conflicts of interest, confusion about the rules, lack of responsibility and waiting “to be told what to do”. The Interim Report from Dame Judith Hackitt (DBE FREng) is scathing of the current UK Building regulations, and those within the… Continue Reading