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 |
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. |
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. |
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 |
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. |
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 |
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 |
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 |
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. -- |
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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