Thingiverse
WorkBench Fume Extractor Fan by dendad51
by Thingiverse
Last crawled date: 3 years ago
After many years of breathing solder fumes and ending up with lung damage, finally this is what I've come up with.
Both sides of my work bench have fans on the end of 90mm PVC pipe. The other end is outside and has a 120mm fan.
Each bench fan has the flap held in the closed position with small disk magnets. When one is opened, it is held in then open position by the disk magnet holding on to a screw on the side of the pipe. The cover flap operates a microswitch to turn on the fan.
Countersink the holes to screw the part1 to the fan.
As the power supply in physically towards the big fan end of the pipe, the big fan is turned on by a PNP power transistor. The transistor is turned on by either or both of the bench fans drawing current via the base/Emitter junction.
On the hinges, the holes may need to be drilled out to suit your selected hinge pins.
I drilled the outside hinge parts on part "1" and both hinges on part "2" to 3mm and used a couple of M3 screws slipped in and screwed into the plastic on the inner hinges on part "1"
Also, drill the magnet mounting hole on the flap to suit your magnets.
Thank you to.. "airforce" for the original fan cover. I couldn't be bothered drawing my own as that one is very good. http://www.thingiverse.com/thing:892548
EDIT: There are some more photos to show closer details.
Both sides of my work bench have fans on the end of 90mm PVC pipe. The other end is outside and has a 120mm fan.
Each bench fan has the flap held in the closed position with small disk magnets. When one is opened, it is held in then open position by the disk magnet holding on to a screw on the side of the pipe. The cover flap operates a microswitch to turn on the fan.
Countersink the holes to screw the part1 to the fan.
As the power supply in physically towards the big fan end of the pipe, the big fan is turned on by a PNP power transistor. The transistor is turned on by either or both of the bench fans drawing current via the base/Emitter junction.
On the hinges, the holes may need to be drilled out to suit your selected hinge pins.
I drilled the outside hinge parts on part "1" and both hinges on part "2" to 3mm and used a couple of M3 screws slipped in and screwed into the plastic on the inner hinges on part "1"
Also, drill the magnet mounting hole on the flap to suit your magnets.
Thank you to.. "airforce" for the original fan cover. I couldn't be bothered drawing my own as that one is very good. http://www.thingiverse.com/thing:892548
EDIT: There are some more photos to show closer details.
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