What Are The Different Types of Ventilation? - ATSPACE

Hi, I'm Paul Whiffin from ATSPACE, and today's question is, what are the four different types of ventilation?
So, we have system 1. System one is an intermittent extract system that tends to be inside the wet rooms, the WC's, the bathrooms, the utility rooms, the kitchens, and relies on the fan to come on and off with a switch. The house tends to also have background ventilation. They tend to be trickle vents in the windows that can be opened and closed, so the fans in the wet rooms, as well as the trickle vents, you create the ventilation for the house.
System 2 is a passive stack arrangement, so a passive stack that has no mechanical features. It's an open bit of pipework basically, and how it pulls air out of the building is by warm air rising, as well as a cross ventilation from outside with the wind that creates negative pressure and draws air out of the house.
System 3 is a continuous mechanical ventilation system, and what that does is it tends to have no background ventilation in the house and solely relies on the fans. These are positioned in all rooms in the properties, tend to be in the wet rooms. How these work is they continuously expel air at a trickle rate, gently taking air out of the room even when they're not used. The minute they are used. They get boosted, they turn up the ventilation rate, and that pulls more air out. So, these come in two types. The two types are either centralised or decentralised.
So, what does decentralise mean?
That means you fit a fan into that room, and it works solely in its entirety on its own. So, it expels air from the fan to the exhaust and goes out the wall. A centralised system is where it pulls air out of the room, and joins all the network of the ductwork into one centralised point, and it has one exhaust coming from that point.
Now we have system 4, a MVHR system which stands for, mechanical ventilation with heat recovery it's a bit like system 3, it comes in a centralised unit as well as decentralised the most popular choice is a centralised unit as the heat exchange is much bigger and what the heat exchange basically does is it recycles the warm smelly, stuffy air and brings the cold fresh air in and has a heat exchange so, it recycles the warmth, the temperature drops are minimal and this affects three main factors why people have MVHR one for home comfort, which is important too, it conserves energy, which is super important as well as saving cost with system 4, airtightness is absolutely paramount so, system 4 doesn't work affective if we've got uncontrolled leakage within a home so, as it's drawing air out, if you've got air coming in from gaps under the window it's less affective, it actually starts cooling the house down with the heat exchange so, it is paramount that you get a house that is super airtight with an MVHR system
Thanks for watching
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