New Dryer Exhaust Duct?

Anyone seen this type of pipe used for a Dryer Duct.?




Am I missing something here?

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Never seen it before Marcel, How long was that anyway? i do not think it would be a problem other wise .

Hi. Wayne.

Longer than the standard 25 ft. :slight_smile:

I’ve see schedule 10 pvc used before and anything else that they have available, but this was a brand new house.
Draw inspection for the bank.
Never seen this type of pipe used for dryer exhaust with duct tape joints.
New technology escaping me or what. :wink:
Might be alright, but can’t find anything to back up my skepticism on the product for that use.

Oh! and by the way, you bring any fleas home from an inspection lately.??:mrgreen:

2006 IRC specifies .016 rigid metal duct only (does 2008 allow PVC?), the ADS literature does not list dryer ducting as an approved use for that product, IRC prohibits the flexible transition connector from being concealed (it may or may not be, hard to tell where it goes after heading up), duct tape should not be the only means of securing joints and the length of the duct is very likely >20’ (25’ - 5’ for the 90°). Other than that it looks great. :smiley:

I know Mike, it looked great, but breaks all the rules that I knew of.
Thought maybe I was falling behind on new technology. :mrgreen:

LOL no fleas lately . That house was a bad dream for sure . Neighbor hooked their drain to the homes septic system also .
Over 25 feet including elbows?
I guess someone will be changing a nice pipe job. Your a meanie Mr Cyr lololol

Nah! Word just gets around. LOL;)

Many times the dryer specs allow for runs longer than 25’ which can trump the minimum requirement of the builing code. i pulled the following out of the IRC.M1502 Clothes dryer Exhaust
M1502.5 Duct Construction
exhaust ducts shall be constructed of minimum 0.016-inch thick rigid metal ducts, having smooth interior surfaces with joints running in the direction of air flow. Exhaust ducts shall be connected with sheet metal screws or fastening means which extend into the duct


The technical data sheet for this pipe says you can use standard PVC drain fittings. If thats the case why did they use duct tape? If the joints are not glued or mechanically fastened I would question the use of the tape. Although the length combined with all the elbows is probably the most significant issue. I have advised my clients in the past this long of a dryer vent will requires routine maintenance due to the reduction in air flow. Most people don’t notice a problem until it starts to take longer than normal to dry their clothes.

Every 90 deg elbow essentially adds or is equivalent to 10 ft of straight pipe.

Duct tape? I know. Long run? yes. Since this was a draw inspection only, I was only paid to take pictures.
Caught my eye because of the type pipe. Thought I was missing something.
Doug, I thought it was 90 degree deduct 5’ and 45 degree, deduct 2.5?
Most of the time the owners manuals are not available for verifying whether or not the dryer is capable of longer runs.
These people are moving in shortly and I forgot to tell him about this.

You think they will notice? :mrgreen::wink:

Even so, it has been my experience that the Draw Companies (Such as Granite and the now defunct DDN) request that you report any Code Violations that you may notice in the course of your site visit. This may not be true for whoever sent you on this one. Wouldn’t hurt to re-read through their inspection guidelines to cover your bases.

My understanding is that flex duct is not allowed to pass through walls and floors. This would create the ‘concealed’ condition, as it cannot be observed from one location, ie. laundry area. Irrelevant that it can be observed from the basement/crawlspace.

This was actually done for another inspection firm out of Arizona that takes care of the Bank inspections out of New Jersey.
Don’t ask me how it works, I don’t know.
The email agreement was no inspection items, defects explained in my letter. Pictures only.
They did call me on the unfinished basement part and told them this was half the basement used for mechanicals and the other half was finsished per the pictures starting at the stair access.
They found me through INACHI. Pays only $60, but if close by and 20 minutes to take pictures, it gets my name out there.
Haven’t received payment from end of June yet. Very slow. :slight_smile:

I agree, poor installation. They had all kinds of room to come out of the floor and straight to the exterior instead of creating that long run. But, I guess the future deck was in the way. :slight_smile:
How do you like these temporary stairs for a couple of years.?:wink:


I agree, the IRC even states transition ducts “.… must remain entirely within the room in which the appliance is installed.” I didn’t state my earlier comment very well.

You are correct on the deduction calculations