No products in the basket.

Order Helpline 01636 639 900

Generic filters
Exact matches only

Order Helpline 01636 639 900

Generic filters
Exact matches only

No products in the basket.

Order Helpline 01636 639 900

Generic filters
Exact matches only

No products in the basket.

Retrofitting a HRV system into your home

Wanting to fit a HRV system into your home but worrying about the potential disruption to home life?

With simple to install units and the correct planning beforehand, retrofitting a HRV system really doesn’t have to be the difficult job you think it is.

Planning is the key to a successful install, so let’s take a look at where to start.


Where are you going to place the HRV unit? This is a vital decision to make before starting work. Selecting the wrong placement makes the difference between an easier install with a system that works well and a difficult install with a system that runs badly.

Where does the unit have to go?

When looking for the perfect spot for your unit, its important to remember a few things before making your decision.

  1. The space has easy access to electricity.
  2. Is within close proximity to an external wall.
  3. Has enough room to become a ‘central hub’ for pipes, ducts and cables.
  4. Is in a place that minimises the amount of ducting required to reach all of your rooms.
  5. Has easy access to the unit.

By ensuring you stick to these 5 simple steps, you are starting on the right foot to making your retrofitting a breeze!

Vents, How many do I need and where do they go?

The number of vents needed will depend on the unit you purchase and the size of the property being ventilated. Most people choose to have one inlet or outlet per room, extracting from your ‘wet’ rooms (kitchen, bathrooms etc) and pushing fresh air into your ‘dry’ rooms ( bedrooms, living rooms etc). However, you can have multiple vents in one room, the choice is yours! It is important to remember you will also have 2 wall vents( one for the exhaust outlet and one for the intake) on your external walls.

The best place for internal vents is in the ceiling or high up in a partition wall ( within at least 300mm of the ceiling) and away from entry doors, this is to ensure that the air is well circulated in each room.  

For external placement, the intake vent should be placed at a minimum of 1.8m away from the exhaust vent. At least 900mm from all pollution sources and at least 450mm above grade. The vents should be placed somewhere that is accessible for cleaning (i.e not placed under a deck).


 Ducting is a necessary part of the HRV system, providing a connection from the system to the outside world, and provides the route around your home to each vent.

When planning your ducting, it is important to ensure the route is sized up and laid out to minimise the airflow resistance or friction.

How do I know what I need?

We get it, trying to plan what you need can seem a daunting task. With ducting, vents, connections and the actual unit itself, there can be a lot of planning trying to work out what you need.
Here at ventilation megastore, we have set up our online kit builder which will help you work out everything you need, as well as giving you an instant price.

Alternatively, you can get in touch with our experts who will be happy to help you plan your system in full.

Installation of Electrics

The HRV unit needs access to mains power to run, ensuring this is part of your planning process will ensure minimal disruption when it comes to installation.  As well as this, the controller requires direct wiring to the unit. This may require having to run cables down the walls or roof. Knowing this in advance and planning exactly where things are going will make the process a lot less stressful.

Need more information?

The initial planning of your HRVU may take some time, but it’s much better to spend that time before you begin your installation rather than after it. By following these simple guidelines, you’ll give yourself an easier time when it comes to install and know exactly what you need to do.

If you need any advice or have any questions, our technical team of experts are available to help. You can get in touch by emailing or ringing 01636 639900.

Book Cover PNG

What Could A HRVU System Do For You?

Discover the true impact a HRVU could have on your property and the vital factors to consider to skyrocket efficiency and slash the likelihood of condensation causing damage.

Please enter your name.
Please enter a valid email address.
Something went wrong. Please check your entries and try again.

Get In Touch

Tel: 01636 639900
Address: Boulder Business Park, Pioneer way, Lincoln, LN6 0QR


About Us
Contact Us
Company Reg : 3479247
VAT GB 706 432 554

Before you go, be sure to

Download Your FREE

Heat Recovery Ventilation Unit Guide

Scroll to Top