Home Improvement

How far can you vent a boiler?

Typically this is around 30-60cm if it’s to the side or above the opening, and a bit more if it’s below. This is because the waste generated by combustion can include dangerous gasses like carbon monoxide, so you don’t want that waste gas too close to an opening where it might re-enter the home.

How far can you run a boiler flue?

All of Baxi’s, Main’s and Potterton’s system or combi boilers with a 60/100mm concentric flue fitted can be up to a maximum length of 10 metres. If you find that you do need a longer flue run, then the flue size can be increased to 80/125mm, giving you a maximum flue length of up to 20 metres.

How far does a vent need to be from a boiler flue?

300mm away

The positioning of the flue needs to be (a minimum of): 300mm away from an opening window or air vent.

How far should a boiler flue stick out?

Under the boiler flue position regulations, the flue has to be positioned a certain distance from any parts of the home that can be opened up such as windows and doors. How far this is will depend on the size of your boiler but is typically between 30-60cm above, below or to the side of an opening.

Can I extend boiler flue?

Boiler flue extensions are used to extend a boiler’s flue outlet system, effectively an additional flue length of either horizontal or vertical orientation. Flue extensions are brand specific and must be the same brand as the manufacturer of the flue piping system that is being extended.

Can a flue be too long?

What is this? The general rule of thumb is that the floor where the fire source (fireplace, wood stove) is located to the top of the chimney should never be less than 15 feet and the distance from roof surface to chimney top should be aimed for 3 feet.

Can a boiler flue run horizontally?

Boiler flues carry out the same job no matter whether they’re installed horizontally or vertically. And that job is to release waste gases produced by the boiler ensuring they don’t leak into the home.

What are the regulations for boiler flues?

A flue that is directed towards your neighbour’s boundary must be 600mm from the boundary and 2m from a door or window in your neighbour’s home. Horizontal flues for condensing boilers must rise slightly in order for the acid water vapour to trickle back down the flue and be safely removed via the condense pipe.

Can you vent a boiler through a roof?

Boiler vertical flue regulations



They can travel through flat roofs or walls at higher points. There is a limit on the distance vertical flues can travel.

Can a boiler flue be near a window?

Usually 300mm if fan flued. This is from edge of flue to the rubber window seal. Ie if the window is non openable at the flue end then it’s ok but if the openable windows seal Is closer than 300mm then it’s not ok.

Does a boiler flue have to be straight?

Does a boiler flue have to be straight? Best practice is to install boiler flues that are as short and straight as possible to maximise efficiency. Nevertheless, some boiler models allow for longer boiler flues which sometimes require bends. The number of bends allowed depends on the length of flue allowed.

Can boiler flue have bend?

Where bends are required, they should be configured in such a way so that the flue has as little bends as possible and must not be so acute that they cannot freely allow the gases to escape. For this reason, bends should be angled at 45 degrees as a minimum.

Where can I put a boiler flue?

The boiler flue terminal should be positioned away from doors, windows or other openings. There should be a space of at least 300mm above, below or to the side of any opening. Harmful gases should be properly expelled from the property, so they cannot re-enter.

Does a boiler flue need planning permission?

You don’t usually need planning permission to replace or install a new boiler. However, if it needs an external flue this needs to be: No more than 1 metre above the highest part of the roof if it’s on the rear or side of a property.

Does a boiler need a chimney?

But while most homeowners are aware of the need to have their fireplace or woodstove chimneys cleaned and inspected, many don’t realize that a gas heating appliance – be it a furnace, boiler, or even a hot water heater – also relies on a chimney for proper venting of the exhaust.

Can a boiler flue go through a chimney?

definitely NO, you have to run the boiler manufacturers flue all the way out, checking the installation instructions on flue lengths number of bends and the termination of the flue, who ever is installing this boiler, GAS SAFE REGISTERED INSTALLER WILL BE ABLE TO ADVISE YOU ON THE BOILER AND THE INSTALLATION.

Can gas boiler flue go up a chimney?

As the flue is rigid it can’t pass up a chimney void which is not straight and the joints would be inaccessible.

Can you install boiler flue from inside?

An installer can stay safely inside the property, core drill the wall, slip a FlueSnug through the hole and fit the flue. No other materials have to be used to seal the hole around the flue other than the FlueSnug itself.

How do you fit a boiler flue to the roof?


So what we're going to do is going to cut the plate. And we're going to cut a hole in the roof. So we can get the fluid. So it's easy to do. Well you know being the slate's not that thick.

How far should a boiler flue protrude from a wall?

Typically this is around 30-60cm if it’s to the side or above the opening, and a bit more if it’s below. This is because the waste generated by combustion can include dangerous gasses like carbon monoxide, so you don’t want that waste gas too close to an opening where it might re-enter the home.

What comes out of a boiler flue?

The boiler flue is essentially the boiler’s chimney, but instead of smoke and soot being channelled away from the inside of the home, it’s mainly carbon dioxide and water vapour that’s emitted.

What’s the difference between open flue and room sealed?

In room sealed systems, such as condensing boilers, the combustion air is supplied from the outside. Open flue systems on the other hand draw the combustion air from within the installation room.

What are the three main types of flue?

There are three types of flu viruses: A, B, and C. Type A and B cause the annual influenza epidemics that have up to 20% of the population sniffling, aching, coughing, and running high fevers. Type C also causes flu; however, type C flu symptoms are much less severe.

Are combi boilers room sealed?

As long as the boiler takes air for combustion from the outside and emits its fumes outside via the flue, it’s safe to install in your bedroom. Although the modern boilers are room sealed, you must still check this before installing the boiler in the bedroom.

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