Engineered airflow systems
Smart Ventilationfor Modern Spaces
MVHR design, installation, commissioning and maintenance.
- Energy
efficient - Healthier
indoor air - Quiet
operation - Expert
support
System key
- Fresh air supply
- Extract air
- Heat recovery core
- Filter
- Fan
Services
Everything from the first drawing to the commissioning certificate.
Ventilation design
Full system design with airflow calculations, duct routing and Part F compliance built in from day one.
Learn moreInstallation
First and second fix carried out by our own engineers — ducting, plenums, silencers and terminals.
Learn moreMVHR systems
Heat recovery units specified, sized and installed to recover warmth from the air you already paid to heat.
Learn moreMaintenance
Planned servicing, filter changes and fault finding to keep systems performing at their design figures.
Learn moreAir purification
Filtration and IAQ monitoring for pollen, particulates and cooking odours in occupied buildings.
Learn moreAcoustic solutions
Attenuators, anti-vibration mounts and duct lining to bring systems inside residential noise limits.
Learn more
How it works
Five stages, no surprises. You get a document at the end of each one.
- 01
Survey
Free site visit. We measure the property, check access and note every constraint.
Site report
- 02
Design
Airflow calculations, unit selection and duct routes drawn against your floor plans.
Drawings + spec
- 03
Install
First fix ducting, then second fix terminals and unit connection around your programme.
Progress photos
- 04
Commission
Every terminal balanced and measured against the design flow rates with calibrated equipment.
Test results
- 05
Handover
Commissioning sheet, O&M manual and a walkthrough of the controls with whoever runs the building.
Part F certificate
Pricing
Transparent packages for flats, houses and commercial spaces.
Start
from£490
Consultation, basic calculations and a recommended solution.
- Up to 50 m²
- 1 site visit
- 3 working days
Standard
from£1,490
Design plus installation of a domestic ventilation system.
- Flat or house
- Turnkey installation
- 7–10 working days
- Most popular
Pro
from£3,490
Heat recovery system with full balancing and commissioning.
- Higher efficiency
- Quiet operation
- Commissioning included
Custom
On request
For larger homes, offices and commercial premises.
- Non-standard buildings
- Detailed design
- Personal calculation
- Survey and measureFree specialist visit and an accurate measure of the property.
- Installation warrantyUp to 3 years on workmanship and installed equipment.
- Service coverPlanned maintenance and support to keep systems running.
All prices are estimates and exclude VAT. Final cost depends on property size, system type, access and the equipment selected. A fixed quote follows the free survey.
Our work
Selected ventilation projects delivered for residential and commercial spaces.
Projects
- ResidentialComfortable indoor air for homes and private spaces.
- CommercialEfficient ventilation solutions for offices and public spaces.
- IndustrialEngineered systems for industrial environments.
MVHR in action
Fresh air in. Stale air out. Heat recovered.
- STAGE 01
Fresh air in
Outdoor air is drawn in through a filtered intake terminal on the façade.
- STAGE 02
Extract air
Stale, humid air is pulled from the kitchen, bathroom and utility room.
- STAGE 03
Heat exchange
The two air streams cross inside the core. Heat transfers across; the air itself never mixes.
- STAGE 04
Supply air
Pre-warmed fresh air is delivered to the living room and bedrooms.
- STAGE 05
Stale air out
The cooled, spent air is discharged outside, having given up its warmth.
- Fresh filtered airClean, healthy air all year round.
- Heat recoveryCaptures warmth from extract air and reuses it to preheat incoming air.
- Lower energy lossRetains heat, reduces heating demand and lowers running costs.
- Balanced ventilationContinuous, balanced airflow for comfort and wellbeing.
MVHR unit
Mechanical Ventilation with Heat Recovery
Continuous ventilation, filtered fresh air and efficient heat recovery in one intelligent system.
Airflow calculator
A first estimate of the continuous extract rate your home needs, worked out the way Part F does it — the larger of the whole-dwelling rate and the sum of the wet rooms.
Your property
One kitchen is always included at 13 l/s, as Approved Document F requires.
Indicative design
43l/s
continuous whole-house rate
plenumair calc --beds 3 --area 95 --wet 5 ✓ 43 l/s
- Whole-dwelling supply
- 31 l/s
- Sum of wet-room extract
- 43 l/s
- Design rate (the greater)
- 43 l/s
- Suggested boost capacity
- ≈ 56 l/s
Indicative only. A full design accounts for floor area, occupancy, terminal positions and duct pressure loss.
Questions
What is MVHR and do I actually need it?
Mechanical Ventilation with Heat Recovery supplies filtered fresh air to living rooms and bedrooms while extracting stale air from kitchens and bathrooms, passing both through a heat exchanger so the outgoing air warms the incoming air. It makes most sense in airtight new builds and deep retrofits, where opening windows wastes the heat you have paid for.
How much does a ventilation system cost?
Our packages start at £490 for consultation and design, £1,490 for a domestic system supplied and installed, and £3,490 for a full MVHR system with commissioning. The final figure depends on property size, duct routes, access and equipment. The survey and the fixed quote that follows it are free.
How long does installation take?
A flat is usually 7 to 10 working days across first and second fix. A house with a full MVHR system typically runs two to three weeks, and we work around the rest of the programme rather than across it.
Will it be noisy?
It should not be. Noise comes from undersized ducts, poor unit placement and missing attenuation, not from ventilation itself. We size ducts for low air velocity, mount units on anti-vibration fixings and fit attenuators where the design calls for them.
Do you provide a commissioning certificate?
Yes. Every terminal is balanced and measured against the design flow rates with calibrated equipment, and you receive the commissioning sheet, the O&M manual and the Part F documentation at handover. Building control will ask for it.
How often do the filters need changing?
Typically every six to twelve months depending on the location and the filter grade. Central London properties near main roads sit at the shorter end. Our service plans cover the changes and log them for you.
Which areas do you cover?
London and the South East, including the M25 corridor, Berkshire, Surrey and Hertfordshire. For larger commercial projects we travel further — ask.
They found the reason our old system was so loud in twenty minutes — the ducts were half the size they should have been. Redesigned, reinstalled, and now we forget it is there.
Homeowner · Richmond
The commissioning pack went straight to building control without a single query. That has never happened to us before on a ventilation package.
Project manager · Ealing
Fitted around our programme instead of fighting it. Turned up when they said, cleared up after themselves, and the flow rates matched the design.
Main contractor · Hammersmith
Get a quote
Tell us about the property. We reply within one working day with next steps and a survey slot.
Rather talk to someone?
- 020 3966 0110
- hello@plenumair.co.uk
- London, UK
- Mon – Fri: 8:00 – 18:00
Send photos of the space and your postcode and we can usually give a range before the survey.
plenumair
Ready to improve your indoor air?
From initial design to installation and maintenance, we build ventilation systems around your property — not around a catalogue.
- System ready
- Airflow optimised
- Consultation available
This site is a concept — and it is for sale
Like Plenumair? Take it live under your own brand.
Plenumair is a demonstration build by Lumith, not a trading ventilation company. The design, the code and every tool on this page can be rebranded and launched for a real installer in days rather than months.
- Rebranded to youYour name, mark, colours, copy and photography.
- Your domainLaunched on the domain you choose, DNS and SSL included.
- Keep the toolsVoice assistant, airflow calculator and enquiry inbox come with it.
- Built to sellStructured for search, AI answers and phone calls — not decoration.
Ready to launch, from
£699
rebrand and launch included · extra pages and features priced per option
hello@lumith.studio