Case Study: Cotswold new build is 100x more airtight than Building Regs and 6x more airtight than Passivhaus

It’s subtle and understated in its impact on UK housing, but this new build bungalow home is one of the most energy efficient buildings in the world, and represents the future of housebuilding in the UK and Europe. We pressure… Continue reading

What’s the difference between an MVHR Heat Exchanger and an Enthalpy that recovers moisture?

Enthalpy Heat Exchanger ERV MVHR

If you’re researching installing a Mechanical Ventilation with Heat Recovery (MVHR) system for your project, you may have heard of an Enthalpy heat exchanger or ERV (Energy Recovery Ventilation). But what is an “Enthalpy” heat exchanger? How does it change… Continue reading

How the cost of an MVHR relates to quality and performance

Crushed and bent flexi-duct will increase noise in an MVHR

I’ve written before about the average cost of a high quality Mechanical Ventilation Heat Recovery (MVHR) installation, which includes itemised costs for detailed ductwork layout, materials supply, installation and commissioning (airflow balancing and handover). Today I’m going to explain (with… Continue reading

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