Manglesphoto wrote:
I found that the dry chems. get packed down from sitting, when we did our weekly safety check in the shops I worked on we would turn the extinguishers upside down and shake them or bang them with a rubber hammer to make sure the powder didn't compact. We also had a company come in once a year and check and recharge all extinguishers. The small 2# were trashed, not worth the cost!!!
I have read that they should be mounted horizontally when mounted on a boat; that way they don't get packed down.