How To Install A Gas Boiler Flue Horizontal TB 152 

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Hello Allen, just want to say a big thank you for the time you take out to do these videos mate, much appreciated.

Brillant video Allen. Thank you very very much for making this so easy and simple to understand, you are a gentleman.

Great video. Keep them coming Allen

Allen thank you very much for your help. Greeting from ALBANIAN 🇦🇱 God bless you.

Easy enough to use the black or white on the measured point and use it as a template to draw around. Great little tutorial Al. Looking forward to seeing how you tackle a vertical with or without bends 🙏👍.

Excellent video this Allen, look forward to the vertical flue install next 🙏👍 thanks as always mate

Excellent video allen

Very detailed and informative. Thanks!

Yr a legend mate cheers for the video have a great day

I used to have a Stanley toolbox with a slot in the top which was just the job for cutting down flues, stopped it slipping. Hacksaw with 32tpi blade does a neat cut, and a half round file to take off the rough edge does a good job. Always seal up with mortar inside and out, then all regs are covered👍🏻

these videos are great for home owners who maybe getting a new boiler and can be reassured as to how a boiler should be installed and how it should look when finished

Absolutely brilliant. Video really enjoy. Keep up the fantastic work. So appreciated. 😊👍

Allen your "spot on" with the sand and cement 👍

Well explained Allen......thanks buddy👍👍👍

I love the vogue! Brilliant boiler, great video sir!

Hi Allen thanks for your informative video well done 👍🏼

Another great video Allen - I’ll definitely use this method for my next install. Thanks 👍

Great video Allen 👍

Thanks Alan, great video as always. Please let me add a couple of more details regarding Ideal Flues(other manufactures’ Flues will differ). Ideal over he last few years changed their coaxial horizontal flues slightly; there’s a ridge on the Air Duct & a Weep Hole. Both of which you can clearly see in the video. This amendment was to stop driving rain from entering the boiler via the air duct, any rain is stopped by the ridge & weeps back out again via the hole. Lastly, I’d always chamfer the Black POC flue after cutting, this will ease Assembly & lessen damage to the Turret Bend seal. HTH Kind Regards Dick Puller👍👍

Colin Colin glad you finally got the measurement accurately

Class Allen !!!!

Great information 👍

Allen, what a video, I was waiting on this for long time, thank you so much very very helpful and you made it so simple to understand, may I request you to explain little bit about the flue extension on your future video, also when you install next boiler can you please explain about hanging brackets on the different types of wall and also the types of screw you use for different walls.

Great videos, i love watching you. I wish to be there, so i can get some experience.

brilliant video allan / u never stop learning thanks for thid video

Nice one Allen.....sand & cement both sides for me every time..... 👍

Nicely explained

great video,, very interesting. Think you need to work on your measurements . I think you was meant to say 350mm not 305mm when measuring the flue length . keep up the great work.

Wow Allan this is the best video I have seen about flue, I prefer hacksaw, so you have total control of cutting the flue, safe, neat and then file it. Differently I use mortar inside and out, so it is secure and sealed properly and definitely on ideal as it does not have screws and clamp as you said anyone can pull the flue out. Excellent video Thank you Allan. My advice is never rush in your job, be calm and read MI properly. I just hate flues sticking out the wall, and whoever does this, it's under cutting other good professionals. It's shamble.

Some good tips there mate

Hi Allen Would love to see a video of how to install a flue sideways as the template only works for a standard rear exit.

A vertical flue with weathering slate would be great in the future 👍👍

Great video My flue goes straight out the wall. But having a conservatory so don't want the flue going out there. Can I cut the ceiling and go up a bit and run the flue 6 feet across so it can go out the side of the house. Would that be okay Thanks

External wall to elbow + 60mm for Ideal. Cut with a hacksaw. Gobbo inside and outside. Stretch the external collar. So easy even our apprentice can do it.

I have never fitted a Vogue so not familiar with the book of words: However I would definitely sand & cement hole and probably fix outer flue to the elbow with a short stainless self tapper. I use a grinder on the outer tube too. :-)

On Ideals put flue elbow on measure to face off brick outside to edge elbow add 50mm perfect, I used to do it your way

3:12 i usually put the flue level or 1-2 degrees down (especially at viessman boilers) during service interventions, most defects in the electronic board, fan and defective gas valves are caused by rainwater entering the outer tube from the exhaust pipe in the boiler. And the guys at viessman were nice enough to make sure that any drop of water that gets from the flue to the combustion chamber will reach either the electronic fan plate or the gas valves ... now they have chosen a location more decent but still could not bear to put a collar for water capture and drainage as other manufacturers do: P

Looks an Ideal way to do it

@ 4:18 I usually put the flue pipe in a 110 mm drain pipe that i fix in the wall with gypsum (hardens very quickly). Lately I leave the 110 mm 1-1.5 cm pipe protruding inside and insert a short screw through it to the outer tube from the flue pipe of the boiler so that it cannot be accidentally removed from the elbow part of the boiler. I prefer to put the chimney in a 110 mm pipe so that in the future, the next time the boiler is replaced, the replacement of the flue will be much easier.

Hi Allen I have an Ideal combination boiler in my wardrobe in bedroom with horizontal flue pipe running along ceiling in bedroom. I’ve just had it boxed in after having a service and the guys used chipboard is this safe. I’m getting headaches I didn’t get before when it was exposed. Also have carbon monoxide detector.

HI Allen great video as usual, there is a Gas Safe TB 152 about securing and sealing horizontal chimneys/flues.

Would you ever think of using expanding foam around the brickwork?

hi Allen. how do i clean the flue - would i be able to disconnected the part above the boiler, remove the elbow and clean both pipes without having to re-cement and re-seal the whole thing?

As an exideal field engineer, we would want to see the flue sealed with sand and cement, as you said we rely on it to hold the flue in place. Also with the inner fall of the exhaust, it is built in, but if you are adding extensions and extending the flue, depending on the length, you may need to add a fall into the flue.

How long should you leave the cement to harden before putting the outside seal on?

Can you use expanding foam for The gap Instead of sand Cement

I bought a Flue Shoe. Personally, for me, it was probably an unnecessary expense. But if you were fitting a lot of flues, I’d say it would be a good tool to have. I bought the reamer too, which I’m not so keen about. Thanks for the video.

Hi Allen can you please make a video of installing a flue to the side of the boiler

from the video and gassafe TB 152 seems sand / cement sealing on both wall leafs is the most reccomended way too 1 secure flue orientation & position and restrict flue removal (with manuractuers clamps & screws if any). 2 help the manufactuers seals/trims exclude gas & rain from the wall cavity interior PS with new homes beiing air tight tested they cant tolerate many air leaks or draughts in or out. Reliable seals on the inner wall needed to stop air movement from cavities.. Fun and games if your doing replacments and bricking outer walls but not doing much wih the inner leaf & sealing.

Great job allen I do sand cement external only I always put screws into the flue .like you said new builds flue too long .

Definitely seal up with sand/cement!

Intergas horizontal flues what is your opinion on these?? With the front wall plate you get for the flue I find difficult to seal on the inside due to the square plate you get.

How do you stop the sound of the wind coming back into the house? That is the main problem we are having since we got a new boiler. Noise of the wind keeps us awake all night.

How Alan, did you do the vertical flue demo

My boiler flue wasn’t put on so the flue was angled towards boiler. Can an engineer do this from outside?

Sir I was also waiting for this video. But please little correction in measurement. 35 cm equals to 350 mm not 305 mm. Thanks

That’s the same way l do the flue, can’t go wrong. Sand and cement always. You have to AR it if only seal one side and ID it if not seal both side. Why manufacturers don’t keep to one standard . Would be nice if I get an invite over when you’re installing the ASHP.

Could you do a video on vertical flues?

❤❤❤

Some engineers use washing up liquid around the flue instead of silicone grease, is that ok or will it cause problems

roy training top man worked for baxi he did some of my training top man

Do it exactly the same as you only i squirt fire proof expanding foam in leaving about 10mm. when it’s set use fire cement to seal inside and out, no mixing up.

Just measure from lip of outside wall too face of 90 bend and add 30mm for slip, perfect everytime

What do you use to fill around flue?

👍👍👍👍👍

Allan what size do you core

350mm Allen mate 😂 305 would be be 30.5 cm not 35 quality as usual though 👍

We had an Ideal boiler installed with too much flue showing and it's position only 19cm from an open window. Ideal withdrew the warranty. The Gas Safe Register are coming to investigate along with the installation company.

Hi, I always use sand and cement, you never know what could happen, if it gets knocked or pulled out in the future, you might end up in court if it kills someone.

Always seal a flue

Foam is fine

An easier way is put the flue in like you did from the start and measure from the wall to the centre of the black mark under the flue (near the end of terminal) measure the distance and then take that measurement to cut of the end thats in the elbow

305 ? 350 mm he means

350mm mate 😀

its 350mm or 35 cm not 305mm ?

35 🤫

when you say "exciting" allen are you going dress up as santa and give us all free prezys.... (excellent video as usual, Ihope my joke doesn't offend you)

350mm or 35cm not 305 surely

350 MM

I’ve seen this technique (using the wall to make the length) go horribly wrong. He measured the wrong side and cut it short! I always measure outside brick to flue elbow. Then cut it down

5 ml off white aloud

At 1. 58 that is not for real ! 😀