Ductwork for kerosene heater?

[bzinsky]

So to make a long story short, I need to make some ductwork for this
http://cdn3.volusion.com/xesye.kfypc/v/vspfiles/photos/HS175KT-2.jpg

Need about 25 feet of flex duct

Just need it to run for about 2 hours. I'd rather not get into details about what its for, just want to know what I can use that I can obtain by tomorrow. I don't see any large enough flex duct at home depot that can handle the output temps.

Thinking about shoving 5 or 6 dryer vents inside a hard pipe then extend the dryer vents. Anybody know of a single flexible duct material that is flexible, could handle the heat for two hours, and something I dont need shipped?

Thanks in advance.

I'd use the heater directly inside the space but I need it to get the place up to 130-140 degrees, dont think thats safe and i dont think the thermostat on the unit will allow it.

 

[brewchief]

The semi rigid aluminum flex would be your best bet, I would use as much rigid steel pipe and elbows as I could before switching to the flex.

A place like sunbelt rentals might rent a heater designed to have ductwork hooked to it.

I would not leave it running unattended and I would have at least one good fire extinguisher close at hand.

 

[pseudorealityx]

Ummm, the max discharge temperature on that heater is 1300 degrees. Please don't try to duct it. These types of heaters are meant to only have enough airflow for their own combustion purposes. If you try to duct it 25', you're going to restict the airflow, and those temperatures are going to climb even higher.

Product manual: http://ecx.images-amazon.com/images/I/C1BWRZkN42S.pdf

 

[zmaxmotorsports]

Ummm, the max discharge temperature on that heater is 1300 degrees. Please don't try to duct it. These types of heaters are meant to only have enough airflow for their own combustion purposes. If you try to duct it 25', you're going to restict the airflow, and those temperatures are going to climb even higher.

Product manual: http://ecx.images-amazon.com/images/I/C1BWRZkN42S.pdf

This sounds like a hold my beer moment waiting to happen.

 

[arch stanton]

Ummm, the max discharge temperature on that heater is 1300 degrees. Please don't try to duct it. These types of heaters are meant to only have enough airflow for their own combustion purposes. If you try to duct it 25', you're going to restict the airflow, and those temperatures are going to climb even higher.

Product manual: http://ecx.images-amazon.com/images/I/C1BWRZkN42S.pdf

This

 

[dave*99]

Best to start looking for another solution. If you add ductwork it will restrict the air flow.
Then the hi temp safety will hopefully shut it down before something much worse happens.

 

[bzinsky]

Ummm, the max discharge temperature on that heater is 1300 degrees. Please don't try to duct it. These types of heaters are meant to only have enough airflow for their own combustion purposes. If you try to duct it 25', you're going to restict the airflow, and those temperatures are going to climb even higher.

Product manual: http://ecx.images-amazon.com/images/I/C1BWRZkN42S.pdf

The burn rate is adjustable, that's the max.

I was planning on turning turn the flame down a bit and compensate for the additional restriction. When you turn the flame down the blower stays at the same speed.

I understand it's not ideal, but I can't think of a safer way to heat an area to 140 degrees without spending a lot of money.

I'm sure we've all done things that we know we can do safely but if you heard about someone else doing the same thing you'd probably think they were a fool. I don't think much can go wrong if I'm carefully monitoring everything.

So I used two 7" flex ducts, like dryer ducts, bent them into a half circle shape, put the flat sides together, and wrapped some aluminum flashing around it so I can stick it right on the blower. Haven't tested it yet though. We'll see how it goes.

 

[Steroblan]

I used one like it 24/7 during winter in ducting to heat a molasses tank. It did not flinch. I did maintain a 2 inch airspace at the discharge point of the heater.

 

[Rook7801]

If you are trying to kill bedbugs with this thing it won't work and is very dangerous. I've ran a pest control business for a decade and have seen people try this and it flat out doesn't get them. The temps need to rise slowly and hold at certain temps for a while to draw them out. Then rise dramatically to kill them before they get back into hiding. If this isn't the purpose. Disregard this message.


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[bzinsky]

If you are trying to kill bedbugs with this thing it won't work and is very dangerous. I've ran a pest control business for a decade and have seen people try this and it flat out doesn't get them. The temps need to rise slowly and hold at certain temps for a while to draw them out. Then rise dramatically to kill them before they get back into hiding. If this isn't the purpose. Disregard this message.


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It is the purpose

Treated them yesterday.

Had the place treated professionally 4 times (chemical.) Heat treatment estimates were rediculous. Two apartments next to each other, ground floor, only 450sq ft each. Their standard flat rates didn't seem to account for the ease of access and size of apartments. Would have gladly hired someone if it wasn't $2-3k.

Use a 10 inch aluminum duct, made my own Y, had 2 8" flex ducts coming off of it, went through two windows, put roxel all around the window, put the koroseen blower about 3ft away from duct entrance so it didn't get too hot, rented 4 air movers, had fire extinguishers present. Had them each at about 140 degrees for 3 hours. Lowest temp reading I got with laser was about 120. Wen't surprisingly well.

From what I understand they die at 105-110.

We'll see how it works. So fustrated with these damn bedbugs.

 

[bzinsky]

I used one like it 24/7 during winter in ducting to heat a molasses tank. It did not flinch. I did maintain a 2 inch airspace at the discharge point of the heater.

Thanks, thats what I ended up doing. Duct work got a bit too hot, gave it more like 2-3ft.

 

[Rook7801]

How did it work out?


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[bzinsky]

How did it work out?


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Well no reported bites, I really waiting for long term results

 

[Rook7801]

Go to the local farm supply and pick up or order Some Transport, Exciter, and Gentrol. Mix all three in a hand sprayer according to the directions and treat all bed frames, drawers, baseboards. Basically any little crack you can find. After the heat this will help kill and nymphs and foraging adults. Good luck!


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