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Air leaks on HF dust collector?

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Forum topic by danofpaco posted 03-28-2013 12:22 AM 1160 views 0 times favorited 14 replies Add to Favorites Watch
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danofpaco

117 posts in 603 days


03-28-2013 12:22 AM

Topic tags/keywords: dust collector hf dc question

So I’m setting up my first dust collection system, running my HF 2HP DC through a thien baffle. I’ve got some HVAC tape and some silicone and was preparing to do some tightening up on my separator barrel. To my surprise, my separator actually seems pretty tight.

Around my DC unit is another story. While I’m going to use hvac tape on as many of the joints as possible on the collector, there seems to be a ton of air blowing around on the motor of the unit itself. Is this normal? Is this just some kind of exhaust from the motor, unrelated to the impeller? It seems to be blowing from the end cap I the motor towards the impeller housing.

I can post some annotated pics if needed, but I thought I’d throw this question ou there in case the answer is, “it’s normal, don’t worry about it.”

Also, I’ve got the Wynn nano filter up top. Should I actually feel air pushing through it?

Really trying to do this right, would really appreciate any help from those of you with more experience.

Thank you!

-- Dan :: Minnesota


14 replies so far

View Dallas's profile

Dallas

3032 posts in 1173 days


#1 posted 03-28-2013 12:43 AM

Yes, it’s normal.
There is an impeller in the motor to keep it cool.

-- Improvise.... Adapt...... Overcome!

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danofpaco

117 posts in 603 days


#2 posted 03-28-2013 12:51 AM

Thank you, Dallas, much appreciated.

I’m trying to do an incense test and its just blowing all over the place making it difficult to determine I there is leakage. I’d hate to have spent the money on a Wynn nano only to have it blowing out of the DC elsewhere. Are there any other good tests I can perform? Is there a recommended set of places in the HF that should be sealed up with HVAC tape? Should I feel a lot of air pushing through my filter? I feel a little, but not the amount I guess I expected.

Thanks again.

-- Dan :: Minnesota

View Dallas's profile

Dallas

3032 posts in 1173 days


#3 posted 03-28-2013 12:57 AM

Seal anything down stream of the intake or you’ll have suction loss.
Seal anything upstream of the intake or you’ll blow dust everywhere.

I don’t use the Wynn filter, but I do use a larger one. There is very little air movement out of the filter probably because the square footage of filtration is a lot more than the bag and the velocity has been reduced a lot by making the volume of air movement larger.

To test, put a cardboard shield around the back side of the motor so the air from it can’t interfere, then test with your incense or a smoke stick or even a cigarette.

-- Improvise.... Adapt...... Overcome!

View Jimbo4's profile

Jimbo4

1145 posts in 1449 days


#4 posted 03-28-2013 02:16 AM

I drew a line on the outside of the fan housing, removed the motor, cut closed cell weather strips to fit just outside the line, punched holes in the strip where the bolts go through, reinstalled the motor. No more air leakage around the motor flange and, lots better suction!

-- *Arachnoleptic Fit*: The frantic dance performed just after you've accidently walked through a spider web.

View danofpaco's profile

danofpaco

117 posts in 603 days


#5 posted 03-28-2013 03:21 PM

Thanks for the reply, Druid!

I don’t suppose you could post a picture? I’m just not certain exactly where you’ve applied the stripping.

Thanks again.

-- Dan :: Minnesota

View Rex B's profile

Rex B

314 posts in 936 days


#6 posted 03-28-2013 03:32 PM

I used caulk to seal the seams on my impeller housing.

Before, I could see small streaks of dust on the housing where the leaks were. Now those are gone. Like Dallas said, I still have air blowing from the motor cooling fan, but I can’t detect any dust escaping the impeller housing. I haven’t done any smoke tests though.

-- Rex

View HorizontalMike's profile

HorizontalMike

6948 posts in 1600 days


#7 posted 03-28-2013 04:34 PM

Also add a strip of foam weather-stripping around the lip where the collection bag straps to the housing. I always found stray leaks where the bag folds and does not seal completely. You could easily see the dust trail left after several hours of operation. The foam tape fixed that quickly.

I will also be considering some of the other suggestions above as well. Good topic.

-- HorizontalMike -- "Woodpeckers understand..."

View Rex B's profile

Rex B

314 posts in 936 days


#8 posted 03-28-2013 05:33 PM

+1 for HorizontalMike’s suggestion, I used weather stripping around where the bag mounts as well.

-- Rex

View Bill White's profile

Bill White

3496 posts in 2646 days


#9 posted 03-28-2013 05:47 PM

Air from thge back of the motor is normal. Its the fan from the tefc motor. Totally Enclosed FAN cooled…...
Bill

-- bill@magraphics.us

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danofpaco

117 posts in 603 days


#10 posted 03-28-2013 06:45 PM

Thanks. Mike, will be adding that tonight!

Rex, any reason HVAC tape couldn’t also accomplish the same thing? I’d rather not have to pull my motor off the stand if I can help it…

Thanks Bill, the more you know…

I did apply some foam stripping to where my canister filter sits as well. Any reason to not just caulk it into place? I don’t anticipate removing it very often, and if I do it should be a pretty quick cleanup to remove the old caulk…

-- Dan :: Minnesota

View Rex B's profile

Rex B

314 posts in 936 days


#11 posted 03-28-2013 06:51 PM

I didn’t have to remove my motor from the stand to apply the caulk, but yeah HVAC tape would be fine.

-- Rex

View danofpaco's profile

danofpaco

117 posts in 603 days


#12 posted 03-28-2013 06:58 PM

I guess I assumed to hit the underside I’d have to pull it off…

-- Dan :: Minnesota

View Airspeed's profile

Airspeed

425 posts in 588 days


#13 posted 03-28-2013 07:16 PM

What do you guys use for duct? I used 4” solid leach pipe, about $5 for a ten foot stick. Seals up without any leaks.

-- http://smg.photobucket.com/albums/v655/aaronhero/

View HorizontalMike's profile

HorizontalMike

6948 posts in 1600 days


#14 posted 03-28-2013 09:46 PM

Dan: ”...I did apply some foam stripping to where my canister filter sits as well. Any reason to not just caulk it into place? I don’t anticipate removing it very often,...”

IMO, do not caulk it in place. Why create the extra work in the future? Just use foam weather-stripping… so much easier before AND after. 8-)

-- HorizontalMike -- "Woodpeckers understand..."

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