seeking 12 feet 5" exhaust hose

I am seeking 12 to 15 feet long 5" diameter exhaust hose. This is the Royal protable air conditioner I purchased at Costco. This is picture of this protable air conditioner exhaust hose:
http://www.royalfulfillmentcorp.com/graphics/StoreBox/products/1181/ack09135.jpg
description: This exhaust hose comes standard with models ARP-1000M, ARP-1000E or ARP-1000DE. This part can be twisted into the inner adapter (which goes on the back of the air conditioner) and the flat (outer) adapter (which goes on the end of the exhaust hose and into the window spacer) to exhaust the hot air outside. This exhaust hose is 5 inches in diameter and can extended 5 feet in length. I think this hose is made of vinyl with wire around the hose. They only have 5 feet long hose. But I need 12 feet long. Can you please tell me where to buy longer hose? Thank you.
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A J Wright wrote:

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I'd suggest completing the run w/ HVAC duct instead -- for that length you'll want to minimize pressure drop.
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5 inch is an uncommon size. If you can adapt up to 6 inch, will be cheaper. Galvanized HVAC vent will have a lot less resistance to the flow of air.
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Christopher A. Young
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There is a reason the hose is only 5 feet long.
The air conditioner's exhaust fan is only sized to push the air through 5 feet of hose. A longer hose will kill the air conditioner's efficiency by restricting the airflow and giving the warm air 2-1/2 times as much surface area to pass its heat back into the room. It's a double-whammy.
Those kinds of air conditioners are meant to be placed near a window.
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http://www.royalfulfillmentcorp.com/graphics/StoreBox/products/1181/ack09135.jpg
FYI, portable air conditioners that have only one hose are inherently less efficient than those with two hoses. The one hose air conditioners are constantly blowing air from inside your house to outside, creating a negative pressure in the house. All the air that leaves will be made up with exterior air, which is unconditioned.
Cheers, Wayne
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The windows is 10 feet away from protable air conditioner. Can you please tell me where to purchase this longer hose?
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Since you are hell bent on the 12 ft hose despite the reasonable objections and views from the users here, I offer this suggestion. Go to your local air conditioning company and buy 8 feet of 6 inch insulated flex duct. put the 5 inch pipe inside of the 6 inch pipe and seal with duct tape. Throw the end of the 6 inch pipe out the window. Problem solved

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P.S. Don't come back here complaining when the compressor burns up because of lack of air flow.

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You're so smart! And you even managed to work "duct tape" into the answer.
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Maybe that's why the AC is protable? So you can place it closer to a win-duh.
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Lol...just ran across this "discussion"...too dam funny...not sure why the PORTABLE AC UNIT on wheels cant be moved closer to a window? Should be a po wer outlet close to that window as well...agree totally about length..for a reason...just wish the hose was a little easier to work with..way rigid... its all about height and angle with this one not very pliable..lol probably for a good reason..I know. I know....but I did manage to add some teal col ored duct tape for the viewing...lol
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http://www.royalfulfillmentcorp.com/graphics/StoreBox/products/1181/ack09135.jpg
*Try mcmaster.com. They have all kinds of hose and flexible duct. I suggest calling the manufacturer of your unit to see if they recommend a larger diameter hose for longer distance.
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