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Forum topic by Holbs posted 02-21-2016 03:17 AM 775 views 0 times favorited 9 replies Add to Favorites Watch
View Holbs's profile


1347 posts in 1453 days

02-21-2016 03:17 AM

Topic tags/keywords: camera duct hvac dryer

This is 1/2 NOT wood working related, yet 1/2 IS wood working related. Or maybe this belongs in the Home Refurb sister site. The experience you have acquired if you have dabbled with ducting and CFM and do’s/dont’s can help you more than your wood working shop. I WAS suppose to finish up my saw vice today but got sidetracked with my new washer/dryer. Having never cleaned my dryer venting, I proceeded today with this $20 tool that I also will be using on my shop ducts:

but alas! There is some blockage in my dryer vent. Unable to see, I purchased this nifty $18 endoscope camera will also be used for my shop ducting at times:

And then, I found this horrible duct connection that I know is something I will be correct with a dryer vent box:

Just wanted to share my duct story and a couple neat tools that will be used for my dryer vent and my shop ducting.

-- Yes, my profile picture is of a Carpenter Bee! The name is derived from the Ancient Greek "wood-cutter"

9 replies so far

View shastaman's profile


30 posts in 272 days

#1 posted 02-21-2016 04:27 AM

When you say duct connection, I am scratching my head to see how there could be a connection with that crumpled duct. Anyhow that’s why I do my own work unless I have a known pro in place. All this crap can be seen eyes wide open before the crook slapped on the sheet rock.

View Fred Hargis's profile

Fred Hargis

3848 posts in 1917 days

#2 posted 02-21-2016 12:44 PM

To be honest we moved 5 years ago, and when I took my then-7 years old ducting apart, there wasn’t a trace of dust, other than very tiny amounts filling the pipe seams (PVC). But that endoscope got my attention, it’s time for my colonoscopy (LMAO). Seriously, that could be really useful for a lot of things, but I guess you have to have a cell phone and I’m one of the 3 people in the world that hasn’t wasted my money on one (yet).

-- Our village hasn't lost it's idiot, he was elected to congress.

View Holbs's profile


1347 posts in 1453 days

#3 posted 02-21-2016 01:02 PM

Fred… this is a Android version that connects directly to a Android Smartphone. They have many version that are USB right to a laptop or PC. Wonder if I can shove it down my throat to see if any wood working fine dust has made it inside. (kidding)

-- Yes, my profile picture is of a Carpenter Bee! The name is derived from the Ancient Greek "wood-cutter"

View Roger's profile


19714 posts in 2227 days

#4 posted 02-21-2016 01:34 PM

Good info Holbs

-- Roger from KY. Work/Play/Travel Safe. Keep your dust collector fed.

View hotbyte's profile


826 posts in 2399 days

#5 posted 02-21-2016 01:40 PM

Neat application of woodworking knowledge!

View derrickparks57's profile


128 posts in 1294 days

#6 posted 02-21-2016 01:44 PM

When I worked in appliance repair I would use a high powered electric leaf blower to clear out dryer exhausts. I cut the original tube short and attached a 4” PVC pipe fitting to the end. It always worked like a champ especially in the high-rise condos with the outlet over the pool. HAHA

-- Derrick, Florida, DP Woodwerks

View clin's profile


486 posts in 419 days

#7 posted 02-21-2016 10:44 PM

Reminds me I need to check out my dryer vent.

By the way, the awareness that LJ has brought to me concerning shop dust has me looking at my home as well. I get peak levels (using a Dylos meter) in my home that are 5X to 10X higher than the peaks in my shop. It’s mystery I plan to get to the bottom of. But also, has my juices flowing to get some real high quality filtering going on in the house.

We’ve run a bedroom air filter for years. The Dylos has proven that the bedroom filter really works to pull the levels down.

-- Clin

View Holbs's profile


1347 posts in 1453 days

#8 posted 02-22-2016 12:33 AM

Clin.. please post your findings on LJ’s, at least in this post (since it’s not EXACTLY wood working related but yet it is ) :)
I am curious to see any relationship between the shop & house for fine dust.

-- Yes, my profile picture is of a Carpenter Bee! The name is derived from the Ancient Greek "wood-cutter"

View clin's profile


486 posts in 419 days

#9 posted 02-22-2016 06:05 AM

Clin.. please post your findings on LJ s, at least in this post (since it s not EXACTLY wood working related but yet it is ) :)
I am curious to see any relationship between the shop & house for fine dust.

- Holbs

To be clear, I DO NOT think the dust in my house is from the shop. Sure, some might be. But my point was not that I think I’m contaminating my house. Rather, that there seems to be something going on that can really cause some high readings.

Note: As near as I can tell, even these high readings are not extremely bad, but do get into the “moderate” and “unhealthy for sensitive groups” ranges. I base this off of this online calculator that converts particle level in ug/m^3 for less than 2.5 um (PM2.5) to an Air Quaility Index (AQI) value.

Since particles have been historically measured by density (mass per volume of air) and not actual count, I have to convert the particle count of the Dylos meter which is in number of particles per 0.01 cu. ft, to ug/m^3.

This is complex and requires a lot of data we just don’t have, like particle density and porosity. But apparently, it has been shown that you can take the Dylos reading and simply divide by 100 and get a good approximation the dust density in ug/m^3.

WARNING: The following are my understanding of how to convert Dylos readings to air quality index values. I could have this all wrong.

So for example, in my shop and walking around (kicking up some dust), the Dylos usually reads about 150 for the fine particles. So this is approximately 1.5 ug/m3 and an AQI of 6, which is in the good range. I think I’ve only seen it exceed 1,000 a few times. So this is ~10 ug/m^3 and AQI = 42 (still just inside the good range of 50).

I do run my Jet room filter any time I’m making dust (and well after) and vacuum up after each work session. I think this helps.

In my bedroom, during the night, the room filter keep things in the 100 range on the meter (1 ug/m^3) or an AQI of 4. But I’ve seen a few times, large hours-long peaks in the range of 7,000 (70 ug/m3) AQI = 158 which is unhealthy. Though as mentioned most of the time at peaks are less than 2,000.

Note: Take ALL these calculations and approximations with a grain of salt. These have come from my searches on the internet trying to relate Dylos readings to air quality. I could easily have misunderstood something and have these conversions wrong by orders of magnitude.

These peaks have been without the bedroom filter running and taken around 4 pm to 10 pm. We’re not in the bedroom then. Though just today I decided to run the filter 24/7.

I don’t know what is causing these peaks. Best guess is that cooking dinner is getting particles in the air. Though I’ve not correlated this yet. And these peaks have happened on days where the central air system has NOT come on. So there would be very little air movement from the kitchen to the bedroom. It’s a large house and the bedroom is some distance from the kitchen. Though it’s not a mansion either.

But, I think these peaks could be dependent on wind speed and direction perhaps affecting air pressures in the house. For example, pressurizing the attic space and forcing very dirty air into the house through ceiling light fixtures and other cracks. Or perhaps there is some part of the house with a lot of dust, and a given wind speed and direction, and combination of doors opening and closing that accounts for this. I just don’t know.

This all has me interested in doing something to ensure better air quality in the house. Perhaps whole house filtering, or some DIY filters like Bill Pentz uses in in house.

-- Clin

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