Is connecting the filter directly to the fan OK or better put some ducting inbetween?

**petrushka** · 05-16-2009, 06:02 PM

I bought this fan RUCK RKW 150-L 700m3, this filter Rhino Pro Filter 150/600 and 5m of acoustic ducting.

My original idea was to connect the filter directly to the fan, then connect the ducting and hang its end outside. I figured this setup would be most efficient and quiet. Actually I even like/liked the concept of Foothill filters best.

But now I read some places that if the fan is attached to the filter a lot of noise would escape from/through the filter and the vibration of the fan can settle/unsettle/whatever the carbon in the filter. Even retailers "recommend using a short length of ducting between the fan and filter (just enough to keep them separated from each other, or as much as necessary for your application) to keep vibration from causing the carbon in the filter to settle".

Is that true?

It seems absurd to insert ducting after the filter

and double the number of potential failure points.

What are your thoughts?

I can't really try it out. I don't want to screw with the ducting too much. I only hope to connect it once right...

Also I forgot to order the clamp to connect the filter to the fan.

Do I need it at all though?
The RUCK plugs nicely into the Rhino. Could I just seal it with duct tape maybe?

**petrushka** · 05-16-2009, 06:25 PM

half an hour, 0 views, 0 answers?

Seemed like a good question to ask. I've done all research. My question is specific but not really that hard...

**abellguy** · 05-16-2009, 08:08 PM

Originally Posted by petrushka

half an hour, 0 views, 0 answers?

Seemed like a good question to ask. I've done all research. My question is specific but not really that hard...

I am not sure about your specific filter but I am using a can 150 and from what I understand when it is filled with charcoal it is vibrated to ensure that all the charcoal packs together. You could check on the manufacturing process for your filter and see if it is the same. I have my can hanging in the room with the fan attached to a flange attached to the filter and then 10" insulated ducting from there out of room. It is whisper quiet even for a 10" fan. It is all taped with duct tape inbetween the metal surfaces that touch and then together. It seem to work fine for me I am sure you could use the clamps though. Hope this helps

**orzz** · 05-16-2009, 08:44 PM

Originally Posted by petrushka

half an hour, 0 views, 0 answers?
Seemed like a good question to ask. I've done all research. My question is specific but not really that hard...

I have 2 6 in fans. One connected directly to a Hepa Filter (air intake for fan cooling) and the other fan connected to a carbon filter (for tent exhaust).

The fans they have set-up for display at the hydro store I frequent has all their fans connecting directly also.

If you are worried you can also use a padded hose clamp.

Hope this helps.

**BasementGuerrilla** · 05-16-2009, 09:16 PM

The best way to do it is to put the fan on the outside of the room and the filter on the inside of the room. Connect the two with ducting and pull air through the filter and vent out of the room. This creates a negative pressure in the room so you know your filter is working efficiently.

**petrushka** · 05-17-2009, 03:53 PM

Thanks!

Mainly I would like to know:

If the filter is directly connected to the fan could:
1) The vibration of the fan damage the activated carbon filter?
2) Would it be noisier than connecting the two with a short piece of acoustic ducting?

**Mcgician** · 05-17-2009, 07:43 PM

IMO, if there's too quick of airflow through the filter, there's a chance some of the air going through it could not be filtered. I'd recommend some ducting inbetween if that's the way you end up running it, but like the other poster said, it's better to separate the filter from the exhaust in different areas.

**pokesalotasmot** · 05-17-2009, 08:40 PM

I bought my 4 inch fan/filter combo from htgsupply.com, and it came with a small piece of ducting. The instructions showed it to be installed inbetween the filter and fan.

What you said about the two being connected directly together contributing to vibrations I think is right. Both my fan and filter are metal, but the piece of ducting kind of acts like a vibration dampner.

Vibration can also be cancelled out though by suspending the fan/filter from the ceiling with bungee cords.