Not too sure about that compressed air idea....
How dry is the air? Will it be monitored for moisture content? Given that the air IS dry enough (less than 5% RH) You will have to supply compressed air 24hrs per day, without any disruption in flow. This will certainly have an ongoing associated cost.
Any disruptions in DRY air supply that go on longer than 1 hour may cause short term duration exposure rules to come into effect, causing possible disruptions to production schedules down the line, or even worse; defects.
Desiccant dry cabinets are safe, and simple. Set an alarm; just to be safe and sure that the RH stays below the 5%, fill and forget....
If the only objective is to reduce moisture inexpensively (without concern for "what if" scenarios...) then you could use a basic box with a light bulb installed (Easy Bake concept). However you'll have to be comfortable not knowing what the RH levels will be, how long will it take to recover after being filled with saturated goods, etc....
Just some thoughts on 'rigging up' solutions to protect valuable MSD inventory.
Automatic dry cabinets that maintain less than 5% RH can be had for less than $ 3000.00, and of course the larger the cabinet required, then presumably the higher the value of inventory to protect.......
Kind Regards,
Kevin McCarten Toyo Living Dry Cabinets
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