Thread Number: 74204  /  Tag: Modern Dryers
Miele T1515 dryer ducting
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Post# 979942   1/25/2018 at 20:49 (266 days old) by enduring (Iowa)        

I have now purchased my second, second hand T1515 dryer for my basement setup. I have to get the electrician over to add 2 more 240v outlets. I understand that the voltage splitters are no longer available from Miele.

I need to duct this second set. I have heard that you shouldn't duct 2 ducts to 1 main duct. IIRC the adjusted length for ducting a miele is 33ft. Because of overhead obstructions I have to add a couple of extra elbows to one of the dryers.

I have been thinking of an inline duct fan and have looked at Fantech only so far. I have an adjusted length of around 45'on the left dryer. This includes 4 elbows (5'each) and one outdoor vent (10'?). I know nothing about dryer fans. I need help.

1) can I add a fan that is easy to maintain and work as it should?
2) can I connect 2 dryers to one vent if I use a dryer fan (I've been told Its not a good idea)?
3) If anyone sees any other errors in my setup, I'm all ears.
4) Are voltage splitters a good idea?
5) If a fan is an option, what are good brands?

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Post# 979946 , Reply# 1   1/25/2018 at 21:06 (266 days old) by enduring (Iowa)        

I just looked up the T1515 duct length recommendation in the manual online. IT states the duct can be max at 66'. That is longer than I thought, is that right? If so, than I don't need a dryer fan.

Post# 980010 , Reply# 2   1/26/2018 at 14:03 (266 days old) by enduring (Iowa)        

Anyone want to share their thoughts on ducting these machines?

Post# 980025 , Reply# 3   1/26/2018 at 16:13 (265 days old) by gansky1 (Omaha, The Home of the TV Dinner!)        

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How far are you having to run ducting?  Do you plan on running them simultaneously?  There are back-flow preventers for vents, relatively inexpensive at Lowes.  This would allow you to join them via a "Y" connector into one outlet to the outside but it's probably not a good idea to run them at the same time as the volume of air may be too great for the 4" venting.  


I've often thought about this problem in my own basement, using a larger 6-8" duct length  and using a booster fan at the end to keep the exhaust air moving smoothly.  The back flow dampers would help with warm, moist air pushing back into the non-running dryers.


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Post# 980028 , Reply# 4   1/26/2018 at 16:44 (265 days old) by RevvinKevin (So. Cal.)        

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Can't help you with the "Y" split or fan for the exhaust run. But what I will say is make sure you use RIGID duct work for those, none of that flexible stuff!

Are the both washers & dryers the same models?


Post# 980036 , Reply# 5   1/26/2018 at 17:38 (265 days old) by enduring (Iowa)        

Thanks to you both for commenting. I was glad to see your posts. I am still considering a dryer fan, as the left set is about 45' adjusted length away from the wall vent. My newer Miele dryer upstairs states 33' max, iirc. As I mentioned above I noticed an online manual with installation instructions mentioning 66'. If that is the case than I don't have an issue with the length of duct. But if that is not actually recommended on these old t1515 I would like to know.

There is probably enough room to run 2 ridged 4" ducts. I have ridged duct there now for the one dryer. I am testing the latest dryer now. It seems to be warm, as warm as the other machine. Neither are hooked up to ducting at this time. My husband states that he thinks 2 4" ducts will fit in the same joist space. So that might be solved.

My plumber came out today and made fun of me, but will put in a sink to the right of the stacked sets when I'm ready. I will drain one of the machines into the utility/laundry sink, and the other through the standing drain already there to the right.

I need to separate the machines about 8", or pull them away from the wall so I can walk behind to do the hookups and clean ducting periodically. I think I will pull them away from the wal
These sets are w1918 and t1515, both. I call them by the city I bought them in. Chicago for the set on the right. Menominee, for the washer on the left, and St Paul for the dryer on the left. Interestingly the Menominee w1918 only goes to temp170f, while Chicago w1918 goes to 190f. I called Miele usa, and they couldn't find the serial # for the Menominee machine.

I'll keep you posted.

Post# 980043 , Reply# 6   1/26/2018 at 18:57 (265 days old) by iej (Ireland)        
This is the correct way

You shouldn’t need any in-line fans and you may mess up the dryers’ airflow by forcing air through them.

You should have a detailed ducting guide in the manual, including how to calculate bends and so on.

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Post# 980044 , Reply# 7   1/26/2018 at 18:59 (265 days old) by iej (Ireland)        

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Post# 980045 , Reply# 8   1/26/2018 at 19:00 (265 days old) by iej (Ireland)        

A Full manual for a vented dryer.
These same tables apply to all of their domestic sized machines (including commercial versions of them)

100mm smooth duct, avoiding bends is fine for two Míele dryers as long as you’re not going for huge runs of duct.

You should configure your duct as above with an overhead run and joining the dryers to it at the side to avoid run back of water. There’s a condensate drain at the end and non return flaps as per the diagram at each dryer. These should only ever be the two leaf butterfly type and NEVER louvers, which will catch fluff.

Bear in mind the non returns and junctions add significant meterage to your calculations and may mean you need 125mm duct.

Post# 980185 , Reply# 9   1/28/2018 at 02:30 (264 days old) by askolover (South of Nash Vegas, TN)        
dryer booster fans

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If needed, there are a few.  I don't know how much you would want to spend.


Tjernlund is over $250


Fantech is cheaper, but I don't know if it's better.

Post# 980495 , Reply# 10   1/29/2018 at 19:37 (262 days old) by enduring (Iowa)        

Thanks @iej and @askolover for the helpful info. I'm pretty tired tonight to digest the tables, but will look at them soon. The Tjernlund fan looks great. I am still planning this ducting and will probably run 2 ducts to vent outside. I'll keep this thread posted.

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