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

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

Manifolds for a radial semi-rigid ductwork system mounted on concrete floor

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

It’s time to end the “shipping container recycling” fad in architecture

Shipping containers in conceptual architecture have become shorthand for “recycling” and “environmental sustainability”, and yet they are neither. You should run a mile from any architectural company that is genuinely enthusiastic about the potential of shipping containers, for the reasons I’ll explain… Continue reading