Articles

Every entry, indexed.

Each entry is written once, sourced, and reviewed on a rolling schedule. Nothing here is paid, sponsored, or affiliate.

• Article

  MVHR in Flats and Apartments: What Is Different

  MVHR is standard in new flats, but ductwork crossing fire compartments needs fire dampers under Approved Document B, units must be compact, and acoustics matter. Here is what differs from a house.

• Article

  Wood Burners and MVHR: Can You Have Both Safely?

  Yes, but only a room-sealed stove with a direct external air supply is safe with MVHR. Here is what Approved Document J requires, the carbon monoxide alarm rule, and the spillage test.

• Article

  MVHR Disadvantages: An Honest Look at the Downsides

  The real disadvantages of MVHR: upfront cost, duct space, filter upkeep, noise if badly fitted, and reliance on airtightness. Here is the honest balance, and when MVHR is worth it.

• Calculator

  MVHR Filter Cost Calculator

  Work out what MVHR filters cost over time. Enter how many sets you change a year, the cost of a set and how long you will own the system for an annual and lifetime figure.

• Calculator

  MVHR Cost Estimator

  Get a rough installed cost range for a whole-house MVHR system. Enter your floor area and a unit cost to see a lower and higher estimate. A ballpark, not a quote.

• Article

  Ventilation in Social Housing Retrofit (ECO4 and PAS 2035)

  How ventilation fits into social housing retrofit under ECO4 and PAS 2035, why it is critical for avoiding damp and mould, and who is responsible.

• Article

  Whole-House Ventilation vs Room Extractor Fans

  The difference between whole-house ventilation and individual extractor fans, when each is enough, and why airtight homes need a whole-house system.

• Article

  NHBC Standards and Ventilation for New Builds

  How the NHBC Standards relate to ventilation in a new build, what the 2026 edition covers, and why the warranty matters alongside Part F for a new-build buyer.

• Article

  MVHR in Older Properties: Challenges and Solutions

  The particular challenges of fitting MVHR into an older or period property, how solid-wall homes handle moisture, and when a simpler system is the better choice.

• Article

  MVHR and Ventilation for Extensions

  How ventilation works for a home extension under Part F, whether you need MVHR, and what to do about a new kitchen or bathroom in the extension.

• Article

  MVHR Troubleshooting: Low Airflow, Noise and Condensation

  Common MVHR problems and how to fix them: low airflow, noise, condensation, cold air and smells. A practical troubleshooting guide for homeowners.

• Article

  MVHR Maintenance and Filter Change Schedule

  A simple MVHR maintenance schedule: how often to change filters, clean terminals and service the unit to keep it running efficiently and quietly.

• Article

  How Long Does an MVHR System Last?

  How long an MVHR system lasts, what affects its lifespan, and the maintenance that keeps it running well for 15 to 20 years or more.

• Article

  Does MVHR Need Planning Permission?

  Whether MVHR needs planning permission in the UK, when external wall or roof terminals can be a problem, and the conservation area and listed building exceptions.

• Article

  Can I Install MVHR Myself?

  Whether you can install MVHR yourself, what a self-builder can and cannot do, and why design and commissioning still need to be done properly for Part F.

• Article

  BS EN 13141: The MVHR Testing Standard Explained

  What BS EN 13141 is, why it matters when comparing MVHR units, and how it underpins the tested performance figures you see for heat recovery and fan power.

• Article

  Indoor Air Quality Monitors Explained

  What indoor air quality monitors measure, whether you need one, and how a CO2 monitor helps you check your home ventilation is working. Impartial guidance, no product sales.

• Article

  MVHR, Mould and Condensation

  How ventilation prevents mould and condensation, why airtight homes need it, and how MVHR, extract and positive input ventilation each help with damp.

• Article

  CO2 Levels and What They Tell You About Ventilation

  What indoor CO2 levels tell you about ventilation, what counts as a good reading, and what to do if levels are high. A practical guide for homeowners.

• Pillar

  Ventilation Rules Across the UK: England, Scotland, Wales and NI

  Home ventilation is regulated differently across the UK. A side-by-side comparison of the rules in England, Scotland, Wales and Northern Ireland, and links to each.

• Article

  Ventilation Requirements in Northern Ireland (Technical Booklet K)

  How home ventilation is regulated in Northern Ireland: Technical Booklet K under the Building Regulations (NI) 2012, the four system types, and how it differs from England.

• Article

  Ventilation Requirements in Wales (Approved Document F)

  How home ventilation is regulated in Wales: the Welsh Approved Document F from 23 November 2022, the new Part O for overheating, and how it differs from England.

• Article

  Ventilation Requirements in Scotland (Standard 3.14)

  How home ventilation is regulated in Scotland: Building Standard 3.14, the building warrant system, and how it differs from Approved Document F in England.

• Article

  MVHR vs Heat Pump: They Do Different Jobs

  MVHR and heat pumps are often confused. One ventilates and recovers heat; the other heats the home. Here is the difference and why new builds often use both.

• Article

  MVHR Duct Design Basics: Rigid vs Semi-Rigid vs Flexible

  Why duct design makes or breaks an MVHR system, the difference between rigid, semi-rigid and flexible ducting, and why flexible is generally discouraged.

• Article

  MVHR Frost Protection in Winter

  What MVHR frost protection is, why it is needed in freezing weather, and the two main ways units prevent the heat exchanger from icing up.

• Article

  MVHR Summer Bypass Explained

  What an MVHR summer bypass does, how it stops the system warming incoming air on summer nights, and whether you need one.

• Article

  How Loud Is an MVHR System?

  How loud an MVHR system should be, what a good unit sounds like, and why most MVHR noise comes from duct design and installation rather than the unit.

• Article

  Central MEV vs Decentralised dMEV: Which Extract System?

  The difference between central MEV and decentralised dMEV extract ventilation, which suits which home, and how they compare on cost, ducting and noise.

• Article

  MVHR Filters: G4, M5 and F7 Explained

  What the MVHR filter grades G4, M5 and F7 mean, which stops what, how often to change them, and why filters matter for air quality and performance.

• Article

  Specific Fan Power (SFP) Explained

  What specific fan power means for an MVHR unit, why a lower figure means cheaper running costs, and how it sits alongside heat recovery efficiency.

• Article

  MVHR Commissioning and Part F Sign-Off

  What MVHR commissioning involves, why Part F requires it, the air flow rate testing, and the rule that results must reach building control within five days of the final test.

• Article

  PIV vs MVHR: Which Is Right for Your Home?

  PIV and MVHR are often confused. Here is the real difference: MVHR is a balanced heat-recovery system for airtight homes; PIV is a low-cost loft unit for leakier homes and condensation.

• Article

  MVHR for Retrofit: Is It Worth It?

  Whether MVHR is worth retrofitting into an existing UK home, what makes it harder than a new build, the PAS 2035 angle, and the alternatives.

• Guide

  Ventilation System Selector: Which System Do I Need?

  Answer three questions to see which home ventilation system is most likely to suit your property: MEV, dMEV, MVHR or PIV. Free, impartial, and based on how airtight your home is.

• Pillar

  How to Compare MVHR Units: Efficiency, Fan Power and Noise

  How to compare MVHR units fairly: heat recovery efficiency, specific fan power, noise, filters and certification, and where to find neutral tested figures.

• Article

  PAS 2035 and Ventilation in Home Retrofit

  What PAS 2035:2023 requires for ventilation in a whole-house retrofit: a ventilation assessment, functional testing, and upgraded systems where mould or condensation is present.

• Calculator

  MVHR Running Cost Calculator

  Work out what your MVHR system costs to run. Enter the unit fan power and your electricity price to get the annual electricity use and running cost.

• Article

  MVHR Running Costs and Energy Savings

  What MVHR costs to run in the UK: typically £65 to £130 a year in electricity, why specific fan power matters, and how heat recovery reduces your heating demand.

• Article

  Passivhaus Ventilation: What PHI Certification Means

  How ventilation works in a Passivhaus, why MVHR is effectively required, what PHI certification of a unit means, and how airtightness ties it together.

• Article

  SAP Appendix Q and the PCDB Explained

  What SAP Appendix Q and the Product Characteristics Database (PCDB) are, and why your MVHR unit needs to be listed for its real performance to count in a home energy calculation.

• Article

  Heat Recovery Efficiency Explained (70% to Over 90%)

  What MVHR heat recovery efficiency means, why it ranges from around 70% in economy units to over 90% in Passivhaus-certified ones, and how much it affects your heating.

• Article

  MVHR and Ventilation for Loft Conversions

  How ventilation works for a loft conversion under Part F, whether you need MVHR, and what to know about extending an existing system or fitting a new one.

• Article

  MVHR for New Builds: The Complete Guide

  Why most new UK homes use MVHR, how it is designed in from the start, what Part F and the Future Homes Standard require, and what it costs in a new build.

• Pillar

  How Much Does MVHR Cost? UK Prices 2026

  What an MVHR system costs in the UK in 2026: a typical installed range of £3,000 to £10,000, an average around £6,450, and a full breakdown of unit, ducting, design and commissioning costs.

• Calculator

  Part F Ventilation Rate Calculator

  Work out the whole-dwelling ventilation rate your home needs under Approved Document F. Enter bedrooms and floor area to get the required rate in litres per second.

• Article

  Airtightness and Ventilation: Build Tight, Ventilate Right

  As UK homes are built more airtight under Part L, natural ventilation is no longer enough. Here is how airtightness and ventilation connect, and the air permeability limits that matter.

• Pillar

  MEV vs dMEV vs MVHR vs PIV: The Plain-English UK Guide

  The four main home ventilation systems in the UK, in plain English: MEV, dMEV, MVHR and PIV. What each does, which suits which home, and the difference nobody explains: only MVHR recovers heat, and PIV is not MVHR.

• Article

  The Future Homes Standard and Ventilation (2027)

  The Future Homes Standard changes home ventilation rules from 24 March 2027: a flat 6 l/s per bedroom supply rate and larger background ventilators. Here is what it means for new builds.

• Article

  Part F Ventilation Rates: Kitchen, Bathroom and Whole-House

  The exact ventilation rates from Approved Document F: continuous and intermittent extract rates for each wet room, and how to calculate the whole-dwelling rate for your home.

• Pillar

  Approved Document F Explained: UK Home Ventilation Rules

  Approved Document F sets the ventilation a UK home must have: minimum extract rates for wet rooms, a whole-dwelling supply of fresh air, and commissioning. Here are the rules in plain English, with the exact figures.

• Article

  What Is MVHR? A Plain-English Guide

  MVHR means mechanical ventilation with heat recovery: a whole-house system that extracts stale air, supplies filtered fresh air, and recovers heat from the air it throws out. Here is how it works and whether you need it.