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Old 01-10-2021, 10:13 PM   #1
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Air intake duct

On my 08 Ambassador the air intake for Cummins engine which comes from roof intake to air filter has broken. Can anyone tell me what type hose this is and where I can get one?
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Old 01-10-2021, 10:27 PM   #2
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what material is yours? metal? rubber? Is is straight or have a curve(s) in it?
I made mine out of HVAC round ducting...so pretty non standard. Since it's before the air filter, it's not critical to be completely air tight though I have it very tight.
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Old 01-10-2021, 10:31 PM   #3
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Originally Posted by Gerald McDon View Post
On my 08 Ambassador the air intake for Cummins engine which comes from roof intake to air filter has broken. Can anyone tell me what type hose this is and where I can get one?
Mine was available through Freightliner. There are several threads on the forum where people purchased online using generic by the foot products.
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Old 01-10-2021, 10:33 PM   #4
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Originally Posted by Dav L View Post
what material is yours? metal? rubber? Is is straight or have a curve(s) in it?
I made mine out of HVAC round ducting...so pretty non standard. Since it's before the air filter, it's not critical to be completely air tight though I have it very tight.
One of these 2 salvage yards may have it:
1. https://rvparts.visonerv.com/

2. https://colawrvsalvage.com/
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Old 01-10-2021, 10:38 PM   #5
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It is a 6” flexible hose or duct. Yes it has a 90 degree turn in it where it enters filter.
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Old 01-10-2021, 11:06 PM   #6
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https://www.lowes.com/pd/Lambro-6-in...e-Duct/3240913
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Old 01-11-2021, 05:00 PM   #7
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https://www.google.com/search?client...2+90+air+inlet


A lot of chassis parts are standard parts.
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Old 01-16-2021, 01:08 AM   #8
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On my 08 Ambassador the air intake for Cummins engine which comes from roof intake to air filter has broken. Can anyone tell me what type hose this is and where I can get one?
Whatever you decide to use, you might consider wrapping the top of the intake with mesh screen like what’s used on screen doors and fasten it with a large hose clamp. The last time I changed my air filter I found what looked like bird nesting material in the pipe!
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Old 01-16-2021, 06:40 AM   #9
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Whatever you decide to use, you might consider wrapping the top of the intake with mesh screen like what’s used on screen doors and fasten it with a large hose clamp. The last time I changed my air filter I found what looked like bird nesting material in the pipe!
My Newmar came with a screen material that was glued to the inside of the fiberglass molded openings in the rear cap. This then leads to a large fiberglass plenum molded into the rear cap. The Tube that attaches to the air filter starts at the very bottom of the plenum (but it is inserted proud of the bottom of the plenum to eliminate water intrusion).

The screen was broken away due to accident damage. I used some solid thin wire ("mechanics wire"), wrapped that around a drill bit and inserted it into the screen holes. I applied adhesive (really body plastic but that's because I was doing much more repairs at the time) and pulled the screen towards the body to reapply it while the adhesive cured. The wire was draped over a small 2x4 and then a weight applied to the other end of the wire to put continual tension on it until the glue set.

Once dry, you just fish the drill bit out another of the holes and pull it out with the wire.

Same technique could apply to put a screen where there never was one.
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Old 01-16-2021, 08:00 AM   #10
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My rig has the air inlet louvered vent on the side, the air is routed through a box that allows for water separation. From there Monaco used a flexible steel reinforced fabric type hose that snakes it's way to the air filter canister. It looks something like this.
https://www.ebay.com/itm/Flexaust-CW...MAAOSwTd9ffHFp


Suggest calling around to some truck shops and see if they have anything that would work. Important that is has wire reinforcing so it doesn't collapse. It's primary purpose to to get air from the oustide to the air filter canister
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