DCHAS-L Discussion List Archive

From: Monona Rossol
Re: vented storage cabinet new thread

Comments on

A storage cabinet designed for research chemicals for developing nations, JCHAS, July/October 2019, Page 29- 32

1. The fan should be explosion proof. Class 1, Div 1, I would guess.

2. The duct is now under positive pressure. It canâ??t go any where but a short run directly out or you risk putting flammable vapors in interior walls or where ever this small duct goes.

3. There was not a word about where the negative pressure in the cabinet is relieved when the door is closed. It would be best if the door was well-sealed when closed and that there are tiny openings at the very bottom level of the cabinet on all four sides or there will be air exchange only at the top.

4. You can make those nice galvanized steel shelves with a resin coating, but make sure there is enough space around the edges for the air to travel through the various levels freely. I would redesign the shelves with a lip at the edge to provide containment and space around for air movement. And perhaps a lipped opening in the middle of each shelf.

5. The bottom shelf should have a containment tray with the estimated 110% capture ala EPA.

6. The text says the fan operates when the door is open which is a waste of electricity because the only area that will be vented will be the top of the top shelf.

There are enough explosions in developing nations as it is.

Monona

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