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Thread: Fresh Air Vents

  1. #1
    Senior Member Brett's Avatar
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    Fresh Air Vents

    For those looking for solutions for ducting fresh air in this may be useful.

    Even though I'm installing a HVAC system that system only circulates interior air, so I needed to find a way to bring air from the outside to the inside.

    This is what I came up with

    Vents match those in the dash (sort of)
    Air is drawn in from the air intake that was used for the VW cooling fan intake.
    P8100005.jpg

    A inline blower motor with speed control will be used to regulate the air (still need to get that)

    Vents will be install in the side since the ones in the dash will be used for the HVAC system.

    P8100003.jpg

    P8100004.jpg

    P8100006.jpg

  2. #2
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    I like that a lot, Brett. What are you using for ducting?
    Thanks,

    Nic.
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    I like that too and once again you are challenging the norm, there have been discussions recently about opening windows and vents in windows (i'm not a fan of them) but is your location for the air entry the best place? I'm thinking rain entering the vent will that get blown into the cabin? even if you have a drain whilst driving some will get past the drain perhaps, also with there being a degree of forced air coming into the opening in cold weather would that create a draft in the cabin? Just food for thought finding a low pressure entry point without water ingress much like the older style squirrel boxes under the bonnet (hood).

    great post lots to think about.

    Dirk

  4. #4
    ***Euro-Nova Supporter*** Peter's Avatar
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    I have a squirrel fan from an old escort under the bonnet (hood),(Left of red battery box) blasts a good flow into the cabin but I have an intermediate phylum box on the bulkhead into which the ducts are fitted so any wet is not blown directly into the cabin.
    008.jpg
    Last edited by Peter; 11-08-2021 at 11:08 AM.
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  5. #5
    Senior Member Brett's Avatar
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    Quote Originally Posted by Nic View Post
    I like that a lot, Brett. What are you using for ducting?
    Hi Nic
    I'll probably use a combination of things. Unlike others I have the canopy lifting system located in that back space and I'll have to get creative to get around it.
    , but for others that have a clear run to the vent it should be just a simple matter of running a flexable air duct to the location.

    Quote Originally Posted by Dirk View Post
    I like that too and once again you are challenging the norm, there have been discussions recently about opening windows and vents in windows (i'm not a fan of them) but is your location for the air entry the best place? I'm thinking rain entering the vent will that get blown into the cabin? even if you have a drain whilst driving some will get past the drain perhaps, also with there being a degree of forced air coming into the opening in cold weather would that create a draft in the cabin? Just food for thought finding a low pressure entry point without water ingress much like the older style squirrel boxes under the bonnet (hood).

    great post lots to think about.

    Dirk
    but is your location for the air entry the best place? I'm thinking rain entering the vent will that get blown into the cabin? even if you have a drain whilst driving some will get past the drain perhaps

    The intent was to look at another option for fresh air into the cabin. If you choose to use it you'll have to get creative to suit your need. Here we get very little rain so thats not a issue. I would think putting an "S" in the duct line with a drain at the low point would solve that issue. Plus you have about over a meter of line to run, I don't think much water(if any) will get through that length of line.
    Those intakes were not being used so I thought I'd make them functional, plus with the mods I made to the vent it no longer will act as a funnel, so that should help. On top of that there is a screen covering the intake to help keep stuff out.
    P8100001.jpg

    P8100002.jpg

    also with there being a degree of forced air coming into the opening in cold weather would that create a draft in the cabin?

    With the vanes in the closed position it seals off the vent

  6. #6
    ***Euro-Nova Supporter*** Peter's Avatar
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    Why run it to the front. why not behind the seats?
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  7. #7
    Senior Member Brett's Avatar
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    Quote Originally Posted by Peter View Post
    Why run it to the front. why not behind the seats?
    I thought about that. That was my first idea of where to place them but I wanted to place them in a spot where they would be directly facing the occupants.
    However Placing a "Y" in the air duct line its possible to put another vent in the back behind the seats. That would increase the circulation in the cabin.

  8. #8
    Senior Member Brett's Avatar
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    I just want to point out that these vents could be placed just about anywhere in the car (side, front, dash, rear). The intake can be anywhere you think is best.
    I don't live in the same environment and have the same issues as you do so my location for the intake or vent will be different than yours. There are no rules where to put the intake or vents.
    I choose this round vent because it was close to matching the dashes vent, it fit in the spot that I thought it would be best suited for it, it can be rotated 360 degrees, and it can be closed when not in use. There are many shapes and sizes of vents out there that have possibilities to work for your particular setup

    So your imagination is the only thing holding you back.

    You could go high tech and put an air filter into the system

    As with many of you have found out, there is only so much you can do with the windows. This is just an idea that may or may not work, but I thought I'd give it a try. You may be able to improve on it and all I have to say about that is, Go For It
    Last edited by Brett; 11-08-2021 at 04:34 PM.

  9. #9
    Senior Member Phill's Avatar
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    That's a great Idea to use the unused air intakes on the side of your car. Nice bit of lateral thinking. Personally I liked the original nostril air intakes on the bonnet of these cars which I assume was designed specifically to be used to provide cabin air. Unfortunately later Nova's in the UK did away with this aspect which I have always thought was a shame as smoothing out the bonnet to do away with the intakes detracted from the design. My other thought was to graft an air intake onto the roof to put air directly onto the screen to prevent misting (which is a problem here in the UK with our damper weather). Something like in the picture below. However, the downside of this arrangement as Dirk says would be the lack of a water trap to prevent rain entering the cabin on a wet day. I can see how a water trap could be engineered into your design (an S bend as you have already suggested) but can't see how to engineer a similar solution to a roof mounted intake. Which is a shame as I like the look and simplicity of the idea

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  10. #10
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    Brett, look at 2" ShopVac hose, it's really flexible, it's what I'm using to bring heat from the heater boxes and fresh air from the front.

    I'm still on the fence about a duct on top of the canopy, but am really leaning towards it. I've designed a damper for the duct using a server and servo controller. It will allow the damper to be opened just a little or all the way. I just haven't gotten to the point of making the ducting.
    Thanks,

    Nic.
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