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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions.

Generator exhaust through a wall?



 
 
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  #1  
Old May 27th 10, 12:23 AM posted to uk.d-i-y
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Posts: 983
Default Generator exhaust through a wall?


Hi,
having tidied my garage I felt it time to sort out the exhaust from the
generator, up until now it has been on a length of 2" dia steel gas pipe
pointing out through a window!

I'm having some pipe made up to feed through a wall and mounting the
silencer on the outside. All good so far, I hope, but I'm not sure how
to seal the hole in the wall. I would rather not leave a gap around it
as there is a possibility of rain running down the outside of the pipe
and into the wall and garage but what do I seal it with and is it a good
move to do so?

The wall is rendered soft concrete block.

Another question, does anyone have experience of high temperature
paints? I believe that there is paint that will withstand high
temperatures and is used to paint exhausts. Yes I will go and Google in
a minute but 1st hand experienced comments are always welcomed. The
idea being that although it is impossible to make an exhaust look
pretty, maybe possible to make it look less ugly.

All comments gratefully received, thanks.
--
Bill
Ads
  #2  
Old May 27th 10, 12:44 AM posted to uk.d-i-y
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Posts: 18,601
Default Generator exhaust through a wall?

Bill wrote:

Hi,
having tidied my garage I felt it time to sort out the exhaust from the
generator, up until now it has been on a length of 2" dia steel gas pipe
pointing out through a window!

I'm having some pipe made up to feed through a wall and mounting the
silencer on the outside. All good so far, I hope, but I'm not sure how
to seal the hole in the wall. I would rather not leave a gap around it
as there is a possibility of rain running down the outside of the pipe
and into the wall and garage but what do I seal it with and is it a good
move to do so?


If its not subject to vibration, a fireclay will work well.


Otherwise you want a collar and a flexible gasket or similar.

The wall is rendered soft concrete block.

Another question, does anyone have experience of high temperature
paints? I believe that there is paint that will withstand high
temperatures and is used to paint exhausts. Yes I will go and Google in
a minute but 1st hand experienced comments are always welcomed. The
idea being that although it is impossible to make an exhaust look
pretty, maybe possible to make it look less ugly.

All comments gratefully received, thanks.


Stove blacking might work, but any paint is likely to come off right
near the manifold, and if you use mild steel, the thing is going to rust
anyway.
  #3  
Old May 27th 10, 02:13 AM posted to uk.d-i-y
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Posts: 4,101
Default Generator exhaust through a wall?

We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Bill
saying something like:

Another question, does anyone have experience of high temperature
paints? I believe that there is paint that will withstand high
temperatures and is used to paint exhausts.


Any decent car accessory shop has spraycans of Sperex exhaust paint or
similar. Trick is, to paint and bake, but if your oven isn't big enough,
or your missus is hostile to the idea, you can cure the paint in-situ by
gently running the engine - instructions are on the can.
  #4  
Old May 27th 10, 02:23 AM posted to uk.d-i-y
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Posts: 78
Default Generator exhaust through a wall?


"Bill" wrote...

Hi,
having tidied my garage I felt it time to sort out the exhaust from the
generator, up until now it has been on a length of 2" dia steel gas pipe
pointing out through a window!

I'm having some pipe made up to feed through a wall and mounting the
silencer on the outside. All good so far, I hope, but I'm not sure how to
seal the hole in the wall. I would rather not leave a gap around it as
there is a possibility of rain running down the outside of the pipe and
into the wall and garage but what do I seal it with and is it a good move
to do so?


I'd go for a downward slope through the wall, then an elbow pointing the
pipe downwards on the outside - I have faith in Gravity To seal the hole
you could try glass-fibre rope (wrapped around the pipe and packed into the
hole) from the Proper plumbers' merchant / stove shop to avoid draughts, and
a piece of suitably-bent ally sheet over the elbow to deflect the rain?


Another question, does anyone have experience of high temperature paints?
I believe that there is paint that will withstand high temperatures and is
used to paint exhausts. Yes I will go and Google in a minute but 1st hand
experienced comments are always welcomed. The idea being that although it
is impossible to make an exhaust look pretty, maybe possible to make it
look less ugly.


I used to use Sperex VHT enamel, sold for exhaust manifolds, not sure if
it's still available or under the same name - Halfrauds will have similar in
a choice of colours, I'd think. I found that it adheres better if stoved
*before* passing hot exhaust through it, give it a day to dry then pop it in
SWMBO's oven on gas mark 6 or 7 for an hour or two, then open all the
windows to let the stink out before she gets home from the shops

Just my tuppence worth,

Dave H.
--
(The engineer formerly known as Homeless)

"Rules are for the obedience of fools, and the guidance of wise men" -
Douglas Bader


  #5  
Old May 27th 10, 07:29 AM posted to uk.d-i-y
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Posts: 6,024
Default Generator exhaust through a wall?

Dave H. wrote:

I'd go for a downward slope through the wall, then an elbow pointing the
pipe downwards on the outside - I have faith in Gravity To seal the hole
you could try glass-fibre rope (wrapped around the pipe and packed into the
hole) from the Proper plumbers' merchant / stove shop to avoid draughts, and
a piece of suitably-bent ally sheet over the elbow to deflect the rain?


I'd suggest glass rope for packing and high temperature silicone sealant
to finish off inside and out. The tube really does need to slope down to
prevent rust and all joints inside need to be gas-tight to prevent
carbon monoxide build up. Ventilation also required as with a boiler.
  #6  
Old May 27th 10, 09:52 AM posted to uk.d-i-y
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Posts: 3,574
Default Generator exhaust through a wall?

Bill wrote:
Hi,
having tidied my garage I felt it time to sort out the exhaust from the
generator, up until now it has been on a length of 2" dia steel gas pipe
pointing out through a window!

I'm having some pipe made up to feed through a wall and mounting the
silencer on the outside. All good so far, I hope, but I'm not sure how
to seal the hole in the wall. I would rather not leave a gap around it
as there is a possibility of rain running down the outside of the pipe
and into the wall and garage but what do I seal it with and is it a good
move to do so?

The wall is rendered soft concrete block.

Another question, does anyone have experience of high temperature
paints? I believe that there is paint that will withstand high
temperatures and is used to paint exhausts. Yes I will go and Google in
a minute but 1st hand experienced comments are always welcomed. The
idea being that although it is impossible to make an exhaust look
pretty, maybe possible to make it look less ugly.

All comments gratefully received, thanks.



Could avoid rust and rain by making a silencer from concrete blocks,
attached to garage wall.


NT
  #7  
Old May 27th 10, 10:51 AM posted to uk.d-i-y
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Posts: 1,576
Default Generator exhaust through a wall?

On Thu, 27 May 2010 01:52:39 -0700 (PDT), NT
wrote:


Could avoid rust and rain by making a silencer from concrete blocks,
attached to garage wall.

I thought of doing something similar except building an outdoor block
'bunker' for the generator and porting the air and cooling intakes
from the outside (possibly easier to do than a hot exhaust), allowing
the exhaust and cooling air to exit via a baffles in the blockwork.

Lift up heavy duty lid for refueling and starting and a removable end
panel for unit extraction / servicing.

Keeps the general noise levels down, less risk of poisoning and takes
up less room in the garage. It could double as a garden bench or BBQ
stand. ;-)

Cheers, T i m
  #8  
Old May 27th 10, 01:28 PM posted to uk.d-i-y
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Posts: 2,330
Default Generator exhaust through a wall?

On Thu, 27 May 2010 00:23:44 +0100, Bill wrote:
Another question, does anyone have experience of high temperature
paints? I believe that there is paint that will withstand high
temperatures and is used to paint exhausts.


My experience with cars is that it only lasts so long - I'm not sure if
it's the temperature that gets to it eventually, or just nasties in the
exhaust gases.

For a fixed install like you have, I think I'd look into adding a sleeve
over the external part of the exhaust; something that keeps itself far
enough away from the hot pipe that it'll stay looking nice (just pay
attention to where any moisture that gets in is going to go - cut a small
drain hole or two at the base if necessary)

cheers

Jules
  #9  
Old June 1st 10, 08:39 PM posted to uk.d-i-y
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Posts: 2,081
Default Generator exhaust through a wall?

On Thu, 27 May 2010 00:23:44 +0100, Bill
wrote:


Hi,
having tidied my garage I felt it time to sort out the exhaust from the
generator, up until now it has been on a length of 2" dia steel gas pipe
pointing out through a window!

I'm having some pipe made up to feed through a wall and mounting the
silencer on the outside. All good so far, I hope, but I'm not sure how
to seal the hole in the wall. I would rather not leave a gap around it
as there is a possibility of rain running down the outside of the pipe
and into the wall and garage but what do I seal it with and is it a good
move to do so?


Buy a Carbon Monoxide detector, or even better build a bunker outside
for the generator and fetch the wiring through the wall.


--
  #10  
Old June 1st 10, 11:29 PM posted to uk.d-i-y
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Posts: 983
Default Generator exhaust through a wall?

In message , The Other Mike
writes
On Thu, 27 May 2010 00:23:44 +0100, Bill
wrote:


Hi,
having tidied my garage I felt it time to sort out the exhaust from the
generator, up until now it has been on a length of 2" dia steel gas pipe
pointing out through a window!

I'm having some pipe made up to feed through a wall and mounting the
silencer on the outside. All good so far, I hope, but I'm not sure how
to seal the hole in the wall. I would rather not leave a gap around it
as there is a possibility of rain running down the outside of the pipe
and into the wall and garage but what do I seal it with and is it a good
move to do so?


Buy a Carbon Monoxide detector, or even better build a bunker outside
for the generator and fetch the wiring through the wall.


Good point.
Bunker is a nice idea but as it is already bolted down and wired in it's
a bit late! The only things left to do are fit the exhaust and build a
small bund around it so the garage doesn't get flooded if there's a
leak.

The exhaust is being fabricated and should be sorted by the weekend.

Only hiccup with the plan is I just had an eye op' and have been told
not to lift anything heavy for 4 weeks, I think that probably includes
oil tanks and exhausts!

Previous advice is taken on board and I'll report back on how it goes.



--
Bill
 




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