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Subject Topic: LPG Drop Out Vent Post Reply Post New Topic
Message posted by AndyDW on 14/11/2013 at 9:39am
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My Coachman Mirage has an LPG drop out vent below the fridge/cooker. It's almost 4inches square, and just a hole cut through the floor.

In winter on an exposed site it lets a howling draught into the van, (you can actually feel it on your ankles).

Is it safe to reduce it's size a little, or is there some sort of shield missing from underneath?

Opinions please:

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Message posted by adge11 on 14/11/2013 at 5:01pm
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justed looked under our 94 Mirage there is a cover about 6"x4" in a u shape screwed to the under side of the van.There are two 4"x1"openings one each side of cover, openngs are pointing to the sides of the van.   In side of van under fridge in floor locker there is a vent 3"x2" with wire mesh covering thee hole.

Hope thiss help!  adge


Message posted by AndyDW on 14/11/2013 at 7:24pm
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Quote: Originally posted by adge11 on 14/11/2013

justed looked under our 94 Mirage there is a cover about 6"x4" in a u shape screwed to the under side of the van.There are two 4"x1"openings one each side of cover, openngs are pointing to the sides of the van.   In side of van under fridge in floor locker there is a vent 3"x2" with wire mesh covering thee hole.

Hope thiss help!  adge






Thanks for reply, that sounds about the same as mine except your vent hole under the fridge is smaller. So thinking it might be safe to reduce size of it a little.

Less space for draught to get in.

Message posted by adge11 on 14/11/2013 at 7:57pm
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the cover is made from tin sheet ie biscuit tin???

6" wide x8" long   start with 1" 90o 1" 90o 4" 90o 1" 90o 1" 90o   forming a u shape  the first and last 1" is the flat surface you screw to the floor    I can not draw the shape on here I hope you can understand it    I could take a photo if needed

adge11


Message posted by arc systems on 16/11/2013 at 12:28am
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Gas drop holes should not be anywhere near as large so not cause a draught problem, the fridge one particularly should be inside the room sealed area of the fridge so cause no draught at all!
Gas drop holes then should be around 40mm diameter, no more.

Your overall problem then is your van like mine and 1000's of others was built to a new ventilation standard brought in in the 80's and after gas lights ceased to exist.
This new standard required massive amounts of floor ventilation, (nothing to do with gas drop holes), but for whatever reason proved ideal in summer but hopeless in winter.
The other problem was, this new standard soon proved impossible for motorhome builders to conform to, mainly because on the move, the floor ventilation pulled road fumes inside and 'gassed' the occupants!!
Motorhome manufacturers then set about sorting out their own standard, either that or kill all it's customers!!

Anyway after several years of dual standards, the caravans joined the motorhomers in the 1998 season.

So and not counting small gas drop holes under or near gas connections, these along with the fridge vents being considered extra and should where they are sited, not cause a draught.
The current minimum requirement for a van with 10sq meters of floor space is; 14000sq mm of fixed high level ventilation, this being covered by one standard 400mm square roof vent in the closed position.
Floor or low level ventilation though is just one 10th of this at 1500sq mm, or put another way, a slot 15mm x 100mm! perhaps the door vent is already bigger than that?

Message posted by AndyDW on 16/11/2013 at 8:21am
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Very interesting Arc, thanks. My fridge wasnt even in a sealed area.

There was a gap under the sink, to the left of the fridge, the depth of the fridge and about 4inches deep.

The gap at the rear and bottom was the width of the fridge and 7 inched wide.

Made covers for all those now so thats fixed. But the gas hole is not in the sealed area but towards the front of the cupboard space under the fridge, as are the gas connection/taps.

Always going to get a bit of a draught coming up it, but you think its safe to reduce it's size maybe to 3" x 2" giving 6 sq"?

Or can I go smaller, closer to your 1500 sq mm ? At the moment it's area is 16 sq "

The door vent is louvered and about 7 inches square. Double skinned of course so not sure whats between.

No draughts come through that however





Thanks again.

Andy






Post last edited on 16/11/2013 09:33:29

Post last edited on 16/11/2013 09:37:01

Message posted by AndyDW on 16/11/2013 at 9:00am
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Post last edited on 16/11/2013 09:29:20

Message posted by AndyDW on 16/11/2013 at 9:02am
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Sorry double posted while editing

Message posted by arc systems on 16/11/2013 at 11:38am
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The vent under the gas manifold taps is a gas 'drop' hole emphasis then on drop, it is then designed to let any leak of gas escape and nothing to do with ventilation letting air in for you to breath.

As I said then these gas drop holes need to be there but only need to be small to stop gas building up in a confined space and by being small limit annoying draughts. They are not then to be counted towards or substituted for normal low level ventilation, their extra!

In short then regrds your vent, I'd block off what's there now, then buy a standard small round plastic caravan gas drop hole fitting and fit that next to and near enough below the taps.

Id also investigate why you don't get a draught from the door vent? I'd of thought you should!
.......................
Overall, the van is a small space, the roof vent will not prevent warmed air passing out if floor ventilation is equally large.
The trick then is to severely restrict cold air coming in at floor level so slow down that air's passage through and giving it chance to warm up.
Otherwise, turning up the heating in the hope of making the van warmer is almost counter productive?, all your doing is speeding up that passage straight out the roof!

Message posted by AndyDW on 16/11/2013 at 11:57am
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Quote: Originally posted by arc systems on 16/11/2013
The vent under the gas manifold taps is a gas 'drop' hole emphasis then on drop, it is then designed to let any leak of gas escape and nothing to do with ventilation letting air in for you to breath.

As I said then these gas drop holes need to be there but only need to be small to stop gas building up in a confined space and by being small limit annoying draughts. They are not then to be counted towards or substituted for normal low level ventilation, their extra!



In short then regrds your vent, I'd block off what's there now, then buy a standard small round plastic caravan gas drop hole fitting and fit that next to and near enough below the taps.

Id also investigate why you don't get a draught from the door vent? I'd of thought you should!
.......................
Overall, the van is a small space, the roof vent will not prevent warmed air passing out if floor ventilation is equally large.
The trick then is to severely restrict cold air coming in at floor level so slow down that air's passage through and giving it chance to warm up.
Otherwise, turning up the heating in the hope of making the van warmer is almost counter productive?, all your doing is speeding up that passage straight out the roof!




Thanks for comprehensive reply to this Arc. I understand what your saying about heat out and cold air in.

I'll have a look for some specific type drop out vents.

As for the door vent I intend taking the frame off soon to reseal, so I'll check it out then.

Cheers.


Message posted by arc systems on 16/11/2013 at 2:13pm
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This is generally what your looking for but smaller, about 40mm overall for a 25-30mm hole.

It's Gary BTW

Message posted by AndyDW on 16/11/2013 at 3:06pm
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Quote: Originally posted by arc systems on 16/11/2013
This is generally what your looking for but smaller, about 40mm overall for a 25-30mm hole.

It's Gary BTW




Thanks Gary (I'll remeber that for next time).

Regards
Andy

Message posted by listerdiesel on 17/11/2013 at 5:37pm
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We used the small round drop vents from ebay in the trailer, two by the Carver water heater, 6 by the cooker/fridge and oven, and another four round the inside fixed autogas bottle.

This type:

http://www.ebay.co.uk/itm/130878711592

They are about 1.8sq cm in cross-sectional area**, so 18sq cm for the 10.

Based on approximately 49mm internal diameter

Peter

Message posted by AndyDW on 17/11/2013 at 5:48pm
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Quote: Originally posted by listerdiesel on 17/11/2013
We used the small round drop vents from ebay in the trailer, two by the Carver water heater, 6 by the cooker/fridge and oven, and another four round the inside fixed autogas bottle.

This type:

http://www.ebay.co.uk/itm/130878711592

They are about 1.8sq cm in cross-sectional area**, so 18sq cm for the 10.

Based on approximately 49mm internal diameter

Peter




Thanks Peter, I've had a look on fleabay and found those now.

Andy

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