Ventless Crawl With Vacuum

[Troy Farmer]

I thought I would share with you all, this is the third time I have seen this there are no vents in the crawl space just the vacuum under the house on the far East side next to the furnace, its termination point is next to the A/C unit (which is fine). However on the far East side there is some mold noted below 9 sqf. So does anyone out there no the benefits of this unit?
Does it cost lest to put this in versus pouring for the vents?
Feed back would be great.

[Michael Larson]

Is that being used for Radon mitigation?

[Troy Farmer]

No just to keep the air in the crawl (good) Radon is very low here my tests have shown less than 1.0 pcl

[Troy Farmer]

Let me just say if it is they dont know it.

[Brian A. MacNeish]

Originally Posted by tfarmer

I thought I would share with you all, this is the third time I have seen this there are no vents in the crawl space just the vacuum under the house on the far East side next to the furnace, its termination point is next to the A/C unit (which is fine). However on the far East side there is some mold noted below 9 sqf. So does anyone out there no the benefits of this unit?
Does it cost lest to put this in versus pouring for the vents?
Feed back would be great.

So it's in exhaust mode and not supply?? May be trying to imitate a system invented by a guy I knew in my old haunt of New Brunswick- The Humidex. Will "work" in certain weather and cause problems in other!!!

http://www.humidexatlantic.com/conte...humidifier.cfm

More later...got to go!

[Michael Larson]

Troy, I have also seen this type of unit used for clothes dryer venting on long runs.

[Barry Adair]

Originally Posted by mlarson

Is that being used for Radon mitigation?

I've only seen pix but I think you're on to something here...metal pipe???
I could see no other purpose.
Did the pipe originate under a barrier or slab and exit the exterior or through the roof?

old thread

[Brian A. MacNeish]

Originally Posted by mlarson

Troy, I have also seen this type of unit used for clothes dryer venting on long runs.

Reminds me of a consulting job I did for Sears Indoor Air Quality division 5-6 years ago.

They were called to fix the problems with the long (40-50' or so) dryer duct runs in a newer condo, charged the condo over $4,000 but their fix didn't work. I ended up recommending units like that (Fantech) controlled by pressure switches.

[Troy Farmer]

The metal duct that moves the air is only about 2 feet long it comes up under garage floor area and terminates to the vacuum. The airflow terminated through the garage wall to the exterior near the a/c (its got good air you could probably blow dry your hair not mine)

[Barry Adair]

I quit blow drying after this incident

[Troy Farmer]

isn't it funny the things we do to pass the time.
we are so easily amused

[Brian A. MacNeish]

Originally Posted by tfarmer

The metal duct that moves the air is only about 2 feet long it comes up under garage floor area and terminates to the vacuum. The airflow terminated through the garage wall to the exterior near the a/c (its got good air you could probably blow dry your hair not mine)

The end under the garage floor area is open to the ambient air and does not go under a concrete slab?

How is the system controlled? Is there a dehumidistat as a main control or is it simply a switch? Or a 24 hour timer?

[Troy Farmer]

Originally Posted by Brian A. MacNeish

The end under the garage floor area is open to the ambient air and does not go under a concrete slab?

How is the system controlled? Is there a dehumidistat as a main control or is it simply a switch? Or a 24 hour timer?

Yes, It comes up through the crawl next to the furnace which is the firewall area (but up through the ground) No switches were noted in the area of the vacuum, no thermostat was noted (outside temp was 26 degrees and snow)
Continual sucking was noted

[Barry Adair]

Originally Posted by tfarmer

isn't it funny the things we do to pass the time.
we are so easily amused

sorry for ripping off your question, bad-bad badair

[Troy Farmer]

No worries