How the price 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 price of a high quality Mechanical Ventilation Heat Recovery (MVHR) installation, which includes an itemised price for each detailed ductwork layout, materials supply, installation and commissioning (airflow balancing and client handover). Today I’m going… 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

What puts people off about MVHR systems? Cleaning ducts, airborne viruses and maintenance explained

MVHR Manifold and radial system ducting

In my role as the lead MVHR technician at one of the UK’s best low energy design building consultancies I have received lots of questions and queries about MVHR systems. I’ve collected together my responses to some of the most… Continue reading

Difference between a branch and radial MVHR duct system – and which is better?

Radial MVHR ducts running into a manifold

When you have decided to specify a Mechanical Ventilation with Heat Recovery (MVHR) system for your home, it can quickly become confusing which type of ducting to use. There are two main types of MVHR ducting to choose from, explained… 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