Hello all, I've been using the cheap Chinese VFDs for a few yr now with success. The trick is to either put in a dustproof enclosure, or adequate inlet filters to prevent metal dust from getting inside to the electronics. Here is the way I've attached filters - use the adhesive backed velcro to hold filter in place. A couple of photos makes it easy to see.
The first shows how the velcro is glued around the air inlets. The air movement on these VFDs seem to always be with the fan pulling air in thru all the other openings and out at the fan. Just to add, I think this is the filter used: https://www.amazon.com/dp/B002GKC2US/
The next shows the filter material attached to the velcro. The velcro makes it easy to remove, clean, and install again.
The first shows how the velcro is glued around the air inlets. The air movement on these VFDs seem to always be with the fan pulling air in thru all the other openings and out at the fan. Just to add, I think this is the filter used: https://www.amazon.com/dp/B002GKC2US/
The next shows the filter material attached to the velcro. The velcro makes it easy to remove, clean, and install again.
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