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Blog entry by Bob Current posted 145 days ago 821 reads 0 times favorited 7 comments Add to Favorites Watch

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-- When you are wrong admit it, when you are right forget it.



7 comments so far

View Jetlag's profile

Jetlag

29 posts in 758 days


#1 posted 145 days ago

Rmc, nice dc system. Where’s the outlet for the air? Is it just a straight pipe to the outside? Or a vent or something? And how is the HF dc with a Thien baffle controversial? I have that set up and IMHO it is the best bang for the buck.

View holtworks's profile

holtworks

4 posts in 481 days


#2 posted 145 days ago

That’s the setup that I will build. Thank you for showing me how to do it.

-- Drexel

View Bob Current 's profile

Bob Current

300 posts in 216 days


#3 posted 144 days ago

Jetlag,
Maybe wrong choice of word, maligned might have been better. In my research for this project I witnessed a lot of passion both for and against many of the choices of systems.
It’s like the Ford vs. Chevy thing with car guys.
The outlet air vent is connected to the picture left from the rectangular opening hosed to the pipe that goes down to 90 ell and out through a brick wall to a termination like a larger dryer vent. (It’s hidden behind bush)
It is very inexpensive but it works. I made a good decision by keeping the motor and fan in their original design orientation. Another LJ reported problems with is laying n the side after was done.
I figured if I was going to reconfigure something best not do it to a higher priced unit. I can buy another one of theirs’ for less than the cost of a good replacement motor.
Everything on the build is assembled with screws and accessible so I could change a fan set out in 15 minutes.
Bottom line,it works fine.

-- When you are wrong admit it, when you are right forget it.

View Bob Current 's profile

Bob Current

300 posts in 216 days


#4 posted 144 days ago

Holtworks,
Thank you, let me know if you need any more details

-- When you are wrong admit it, when you are right forget it.

View Grumpymike's profile

Grumpymike

1003 posts in 914 days


#5 posted 144 days ago

Your DC looks like it will work fine in your shop, but I have a question … If the exhaust air from your DC vents outside, where does the intake air come from?
OK, here is the logic: Lets say that your DC moves somewhere around 1000 CFM, (just a round number) ... Then it exhausts 1000 CFM and sucks in from the cold outside 1000 CFM of cold air …
?
Or did I miss something? I recirculate The conditioned (heated or air conditioned) air in my shop after filtering to 1 micron.

-- Grumpy old guy, and lookin' good Doin' it.

View Bob Current 's profile

Bob Current

300 posts in 216 days


#6 posted 144 days ago

Holtworks,
Thank you, let me know if you need any more details

-- When you are wrong admit it, when you are right forget it.

View Bob Current 's profile

Bob Current

300 posts in 216 days


#7 posted 144 days ago

Mike,
Correct logic, I pull the heated air from the adjacent much larger heated garage. As stated in my write up I only run this DC when I’m operating dust and chip producing machines. In the case of your example a 1000 CFM unit would require a fair amount of energy to heat as the other garage heat is not free.
I don’t think this HF unit is operating at that rate of airflow but I plan to put test instruments on this soon to test the airflow.
I feel oversized piping is a double edged sword because you need velocity to entrain the dust and chips so I’m trading airflow on that fan for static pressure.
It should come as no surprise that they do not supply a fan curve with the unit.
I use this shop for working on a bunch of non woodworking repair work so during those times I use my air turnover (no makeup) air cleaner to keep the dust down.
It circulates the air in the room about every three minutes through 2” pre filters and Merv 8 panel filters.
You can actually see the air moving when it’s dusty and I turn it on.
In the summer I would be out of luck for maintaining cooling as the other garage has no AC. My preferred mode of operation is garage door open high enough for ventilation but low enough to avoid onlookers.
I need exhaust from time to time and I use the DC for this as well.
Thank you for your interest.
RMC

-- When you are wrong admit it, when you are right forget it.

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