max length of 50 mm hose without loss of suction, efficiency ?

[Rob Z]

A question for Shane:

Does Festool have a recommended  maximum length of the 50 mm hose, when used with a CT22 or CT26, without substantial loss of efficiency?

Would I still have decent results from the CT if  I joined two sections of the 4 meter x 50 mm antistatic hose, with a short section of smaller hose (either 27 mm or 36 mm) making the final connection to the tool?  Assume the length of hose is routed such that it has straight runs with wide turns, rather than being tightly coiled or with sharp/tight bends.

I have a boom arm on a CT already, but am thinking about installing a run of  50 mm hose from another CT, and suspended from the ceiling over the line of 3 MFT's which we use in the shop.

Thank you.

 

[Administrator_JSVN]

Rob,

There are some recommendations, but I don't remember the specifics off the top of my head. I can see about getting them for you tomorrow when I'm in the office. However, there's not going to be an issue with joining together the hoses you're talking about. I'm pretty sure that it's good up to ~60'. There's also a thread on the forum if I can find it about the topic. I think someone was wanting to run a tool in their attic or something while leaving the CT down below.

Shane

Ah ha! Those search improvements must have helped, I found a couple of threads quickly.

http://festoolownersgroup.com/festool-tools-accessories/maximum-hose-length/
http://festoolownersgroup.com/festool-tools-accessories/ct-22-reach-possible/
http://festoolownersgroup.com/festool-how-to/what-is-the-maximum-effective-length-of-a-hose-for-a-ct22-dust-extractor/
http://festoolownersgroup.com/festool-tools-accessories/maximum-hose-length/
http://festoolownersgroup.com/festool-how-to/ct-133-hose-length/

According to one of these, they say we recommend a maximum of 7m. That seems low to me.

 

[Rob Z]

Shane, thank you...I read those threads and it looks like the 7 m length was for the 27 mm hose.  If you're able to look this up when you get into the office tomorrow that would be great. 

 

[Administrator_JSVN]

Rob,

I was able to gain access to some information. The maximum length for combining D50 and D27 hoses is 98'. We would only recommend this length, or lengths beyond say 60' for fine dust like that produced by sanders. The D50 length should represent roughly 2/5 of the total length, the D27 the remainder.

So, you're well within these specifications with a 4m D50 and shorter D27.

Shane

 

[Rob Z]

Shane, that's good info.  Thanks for checking on that for me.

 

[semenza]

And on an individual / annecdotal note....  I have about 10'  of 2" PVC conduit between my 27/36 hose and the CT.  With three curves and not anti-static.  I don't notice any loss of suction using any of the tools that makes a noticeable degredation to dust collection, with possible exception of Kapex.

Seth

 

[Tim Sproul]

I have a boom arm on a CT already, but am thinking about installing a run of  50 mm hose from another CT, and suspended from the ceiling over the line of 3 MFT's which we use in the shop.

Thank you.

sounds like you need another CT or a bona fide dust collector.

Not a long run of hose.  a length of 50mm antistatic hose is a good ways towards a new CT.

 

[Rob Z]

Seth, that's interesting.....the one time I have seen what seemed like static build-up was the other day when sawdust was sticking to the outside of the 36mm AS hose while I was using the track saw.  And we've used runs of the non-AS hose and never witnessed or felt any static.

 

[semenza]

The Festool AS hoses cease to have the AS effect if they are not connected to the CT.  In my shop set up (with the PVC) I use a jumper wire from the Festool vac end hose connection to the CT in order to preserve the AS qualties.

I only mentioned that the PVC was Non-AS because  my thought was that non-AS might create more friction, inhibiting dust flow somewhat more than AS. Thus reducing collection even though it is only about 10'. I do not know if this is true though.

Seth