On top of that, if one has the air flow keeping fumes from one's head, any movement of bodies in the room will disturb the air flow -- minor issue.
On top of that, if one has the air flow keeping fumes from one's head, any movement of bodies in the room will disturb the air flow -- minor issue.
"Landscapes exist in the material world yet soar in the realms of the spirit..." Tsung Ping, 5th Century China
I would like to add that dumping warm moist air into a cold attic is not best practice. It is much better to exhaust to the great outdoors so moisture doesn't condense and cause havoc with the building. I'm sure it depends where you live, and that it may be a bit temperature dependent, but it is currently in single digits here and all my vents in the house go outside.
HRU Wash Step Dental Clips 2 by Nokton48, on Flickr
I used a driveway drain glued to PVC pipe and the largest bathroom fan I could find. It does pull odors outside rather well.
Kodak 3F Basket Line 1 by Nokton48, on Flickr
Here's the other side of it. My Contractor and also Electrician put this together with my input. It vents out extreme top left.
Flikr Photos Here: https://www.flickr.com/photos/18134483@N04/
“The secret of getting ahead is getting started.”
― Mark Twain
Here is my “backdraft” ventilation setup:
Photo 1 - two runs of 6” flexible heater pipe, running from two 4x12 boxes cut into the sink shelf, and up to a "Y" connector and up to the fan:
Photo 2 - individual shutoffs for each run:
Photo 3 - Variac transformer, note power level - which is where I typically set this for film and prints. When doing more toxic procedures I turn this up a bit. Full power (like a hurricane!) is hardly needed - but nice to know its there:
Photo 4 - closeup of fan, purchased at Home Depot. Cannot ascertain/remember model, max CFM’s (quiet and powerful), but cost of fan was about 140.00, Variac (from Amazon) was 50.00, Piping, etc., about another 75.00:
Finally, this system vents out of a 6" weather head, the hole for which I cut through the band joist/siding.
Couple of small 4" surplus muffin fans can output 200cfm for $5 each.
Wayne, have you been reading one of those old Popular Mechanics articles telling you how to build your own nuclear submarine using recycled washing machine parts?
No, but 20 years ago when I set up my darkroom someone mentioned surplus muffin fans for a few pennies a piece and I built my darkroom vent with 2 of them. Works great.
How far are you venting (duct configuration), Wayne?
My fans are in the window directly behind my sink. No ducting at all, just a light trap
Bingo. Thanks. Nothing remotely related to true 250 extraction, but evidently useful for simpler applications. I had something similar exchanging air in a makeshift film drying cabinet, with nothing other than basic "permanent" coffee filters glued over the intake and outlet ports to prevent dust.
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