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08-22-2009, 08:26 PM
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Display case Help Needed
I picked up on someone's previous posting that there needs to be a ventilation hole in display cases due to the fact that the ship will emit gases for years due to the CA glue.
If so, can someone tell me some rule of thumb regarding such. My display case is 36" high by 16" deep by 44" wide. I guess I am looking for recommended size of opening and best location of same.
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"Iceberg? What iceberg?" - Capt. Smith
Dave 
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08-23-2009, 04:39 AM
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Re: Display case Help Needed
Hi Dave,
My understanding is that the opening doesn't have to be very large. The cases I have used have handled ventilation differently. Both had a removable panel that the model was attached to. One had the corners of the bottom panel trimmed off, leaving 4 triangular openings about 1-1/2 inches across. The other had the sides of the bottom panel kind of chamfered, leaving long slots along the edges maybe 1/4" wide or a little larger that ran nearly the length of the model. I recently read somewhere that a 1" hole should allow sufficient exchange of about 1 cubic yard of air. Also, keep in mind that there is off-gassing regardless of whether or not you use CA. Wood off-gasses, so do paints, varnishes, etc. I don't think CA releases any more than these other materials. In fact, for what it's worth, the "danger" materials lists I've seen I don't think even list Cyanoacrilates. Clare
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08-23-2009, 10:49 AM
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Re: Display case Help Needed
I assume the off-gases rise.... thus the ventilation openings would best be at the top?
------------Members' Signature------------
"Iceberg? What iceberg?" - Capt. Smith
Dave
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08-23-2009, 01:23 PM
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Re: Display case Help Needed
That's a good question.
The holes in the cases I have are in the base. I recently read that most gas vapors are heavier than air (except for hot gases from combustion) so they will sink toward the bottom of the case - down where you model is.
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08-23-2009, 01:37 PM
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Re: Display case Help Needed
I would put 2 holes about an inch in diameter on opposite ends in the base of your display, the pressure changes in the atmosphere and you moving around in your home or shop will work the air in and out of the case. You can cover the vent holes with some fabric screening or similar material and remember you can always lift the case up from time to time to help ventilate it.
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08-23-2009, 06:55 PM
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Re: Display case Help Needed
You guys are most helpful. I was more prone to putting them at the top, which, appears would have been a mistake. So bottom holes it shall be.
Now, since the plan was to sit the case flush on top of a long wall table, I will need to add some corner blocks to raise it up a little to allow air flow, or maybe I can put the vent holes through the side panels down flush with the base. Thanks
------------Members' Signature------------
"Iceberg? What iceberg?" - Capt. Smith
Dave
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08-24-2009, 06:20 PM
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Re: Display case Help Needed
No problem Dave. Glad to be helpful.
Anyway, this discussion prompted me to look at a display case kit I'm going to use for my 1812 privateer Cora and noticed it doesn't have any kind of ventilation built-in. So, I'm going to have to do the same thing as you - cut some holes or slots in the case and raise it all up just a tad. Either raise it up or cut some slots in the molding around the base. Thanks for bringing up the issue! Clare
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08-24-2009, 11:54 PM
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Re: Display case Help Needed
While we're exploring options does anyone know what the effect would be of adding an inert gass.....ie co2 or nitrogen like in rifle scopes? I've heard that if the oxygen is displaced that it eliminates the possibility of dust creeping in but I don't know what effect it may have on the model itself. Just a thought!
Doug J |
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08-26-2009, 06:46 PM
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Re: Display case Help Needed
I am not a chemist but, other then a vaccuum, I don't see how the type of gas would effect dust. Unless there is a bonding issue with oxygen itself. Your case would have to be airtight tho as any gas would eventually bleed out. Particularly as wood is porous and a wood base wood be a transfer medium. Even the gasses they put in home windows dissapates after a couple of years. This then brings you full circle to your ventilation issue
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Synrac (Michael)
"I may be lost, disoriented and confused but don't let that fool you. I just don't know where I am going."
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