Need a new exhust fan

[Dave Sheldrake]

Hi Rich,

The motor is usually in the vortex at the rear of the fan (outlet side) so dust / crud isn't usually a problem. On my inlines I just drop them out and wash with a pressure washer usually.

cheers

Dave

[Robert Walters]

It looks like a couple of you are already using inline fans, but did you read the specs???

218 CFM @ 1.5" (max)

That's 1.5" max static pressure, not the typical 6"-8" requirement.

Is changing the ducting from 8-12" inline fan down to 4" duct increasing the static pressure to the requirements?

If so, how do you know the reduced duct size is close to the required static pressure and CFM ?

Guessing?

If calculating, mind sharing the formula?



@Rich,

Pressure washer?!
Are they waterproof?

[Dave Sheldrake]

Rob, IP55 on most models, not good for submersion but will take pretty much anything else done sensibly.

cheers

Dave

[Rich Harman]

I often wash simple electronic devices, provided they are something that I can be sure will dry thoroughly. For example I have a humidifier (fan type, not ultrasonic) that I will yearly toss in the dishwasher. The first time was out of frustration because it was so difficult to get clean, after it was a success I do it every time it needs cleaning - it even has a small electronics board in it that has suffered no ill effects. Which reminds me, it is that time of year again...

Water is often not nearly as hazardous to electronics as you would think. The key is to not allow any power to run through it until it has been thoroughly dried. It does't always work but my experience it does work more often than not.

[Dave Sheldrake]

I often wash simple electronic devices, provided they are something that I can be sure will dry thoroughly. For example I have a humidifier (fan type, not ultrasonic) that I will yearly toss in the dishwasher. The first time was out of frustration because it was so difficult to get clean, after it was a success I do it every time it needs cleaning - it even has a small electronics board in it that has suffered no ill effects. Which reminds me, it is that time of year again...

Water is often not nearly as hazardous to electronics as you would think. The key is to not allow any power to run through it until it has been thoroughly dried. It does't always work but my experience it does work more often than not.

Yup, my PC keyboards get rotated once a month for a trip into the sink

10 days in the drier and back into use, as yet in 10 years not a problem.

cheers

Dave

[walter hofmann]

hi all
here is a picture from my exaust setup. I use a 500CFM inline fan from hydrophonic ( ebau $85) 6 inch and reduced the in and outlet to 4 inch.

I had to put a chicken wire in front of the machine exaust inlet to avoid that small parts would be sucked out.

this system is so quite that the laser machine noice is louder.exaustnew.jpg
maybe this helps
greetings waltfl

[Bob McGinn]

The classic exhaust fan on the surface will always look like the inexpensive (Home) solution. Suggest you contact your HVAC dealer to understand the excess load all of the Negative Airflow from the laser exhaust is placing on your higher dollar HVAC system. Also never liked the idea of heating & cooling the neighbors yard... There are threads on making a fume extractor or find a BOFA style solution.