Connections for PVC to bath exhaust fan/vent?


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Old 09-18-17, 08:51 AM
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Connections for PVC to bath exhaust fan/vent?

Installing a couple bathroom exhaust fans.. after reading up it looks like PVC is the best bet to use as the "duct" pipe... Problem is, the PVC ID isn't exactly the size of the connection ends on either the fan or the vent that goes on the outside wall (the bath is downstairs.. no roof access).

Is there a special kind of PVC that will fit the regular 4" metal connections? if not, what's the proper way to permanently attach?

Thanks guys.
 
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Old 09-18-17, 10:05 AM
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I wouldn't consider PVC an ideal venting method to use. If it runs thru the attic it needs to be insulated. I use the double insulated flex duct.
 
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Old 09-19-17, 11:50 PM
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Its just going to run along the joists in the bathroom (downstairs.. er.. middle floor of tri-level. it's above ground.) out through the wall where the flashing meets the brick outside. I keep reading thin walled PVC is best for the job but I can't find any in 4". Just 3". As it's a exhaust fan mainly for moisture I was hesitant to use anything metal or the accordion-like where moisture can pool in it. It's going to be difficult to get a proper angle for it to drain the condensation downward to the outside as it is.
 
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Old 09-20-17, 12:06 AM
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You need 10'x4' sch.20 PVC pipe.
 
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Old 09-21-17, 11:25 AM
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Where on God's Earth can I buy some? None whatsoever at Home Depot, Menard's, Lowe's, Grainger, Farm & Fleet, Tractor Supply........
I called one local plumbing supply company and some friendly fella literally just goes "NO." and hangs up on me.

Can't find any online.

Where the hell are people finding this stuff?
 
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Old 09-21-17, 05:01 PM
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This looks like sch 20 PVC.
JM eagle 4 in. x 10 ft. PVC D2729 Sewer and Drain Pipe-1610 - The Home Depot

Although it's heavier.... the sch 40 will work too.
 
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Old 09-24-17, 07:15 PM
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That's listed as SCH40.. I already checked my HD for SCH20. The 40 is too thick to slide onto the vent end (or the fan exhaust pipe). Hence the search for he SCH20. Seriously does anyone know where to get SCH20? Shi*t is basically non-existant but I just keep finding more and more articles that say to use it. ;_;
 
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Old 09-24-17, 07:36 PM
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I didn't realize it was that hard to find.
I thought it was used in outdoor drains.
 
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Old 09-25-17, 09:23 AM
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Me too... this is unreal. Sadface.
 
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Old 10-04-17, 03:52 AM
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Use flex vent pipe to go from the fan to the vent pipe (PVC). To connect to the PVC go to an HVAC shop and ask for a male 4" to a female connector. If you need to reduce the 4" to 3" tell them this or just explain what you need . By the way some Home Depot's and Lowe's sell this stuff if you know what to look for. Another thing the sch. 20 mentioned is probably what we call DWV pipe.
 

Last edited by Steamboy; 10-04-17 at 03:54 AM. Reason: misspelling
 

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