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[tom j]

We really should be asking what type of furnace it is.  While the 20 amp filters would work on a gas or oil furnace (even a wood or coal system), there is a good chance that the OP has an electric furnace that could run as much as 50 amps on a 240 circuit.
While I doubt that tom j has such a device, recommending a 20 amp filter without knowledge of the system would be irresponsible.

Hi Knighttrider, I actually have a gas forced air high efficiency furnace. Going to check to see how it's wire in. if I have to go into the box the XPF 20A Wired-In Noise Filter is to large, could you mount it outside the box. Thanks

Tom j.

Tom,
FWIW
I had Lennox Pulse furnace which gerenated very high noise levels. The source was the ignition/control board which had an on board switching supply. I ended up filtering only the 120V to the board. I did not need to filter the entire supply to the furnace which included the blower. I got away with a smaller sized filter whic I mounted in the furnace cabinet.

Say maybe I could try that, but I would of thought you would of had to put the filter going from of the board I thought it would have picked up the noise while going through the circuit board. Could you please explain the logic. Thanks

Tom j.

[tom j]

Hi Knighttrider, I actually have a gas forced air high efficiency furnace. Going to check to see how it's wire in. if I have to go into the box the XPF 20A Wired-In Noise Filter is to large, could you mount it outside the box. Thanks

Tom j.

Tom,
FWIW
I had Lennox Pulse furnace which generated very high noise levels. The source was the ignition/control board which had an on board switching supply. I ended up filtering only the 120V to the board. I did not need to filter the entire supply to the furnace which included the blower. I got away with a smaller sized filter whic I mounted in the furnace cabinet.

Say what filter would you use to filter only the 120 going into the board, winter will be here before you know it, and I still haven't corrected this.

Tom j.

[dave w]

Say what filter would you use to filter only the 120 going into the board, winter will be here before you know it, and I still haven't corrected this.

Tom j.

I used one similar to this, but it does have some signal sucking characteristics.
http://www.meci.com/product_info.php/cPath/396/products_id/5600121

This filter from X10 should work well
http://www.x10pro.com/pro/pdf/xpf.pdf

[tom j]

Say what filter would you use to filter only the 120 going into the board, winter will be here before you know it, and I still haven't corrected this.

Tom j.

I used one similar to this, but it does have some signal sucking characteristics.
http://www.meci.com/product_info.php/cPath/396/products_id/5600121

This filter from X10 should work well
http://www.x10pro.com/pro/pdf/xpf.pdf

Thanks Dave

Tom j.

[tom j]

Say what filter would you use to filter only the 120 going into the board, winter will be here before you know it, and I still haven't corrected this.

Tom j.

I used one similar to this, but it does have some signal sucking characteristics.
http://www.meci.com/product_info.php/cPath/396/products_id/5600121

This filter from X10 should work well
http://www.x10pro.com/pro/pdf/xpf.pdf

Hi, doesn't the X10 Pro have to be wired directly into your control panel? I was thinking about the way Knightrider did it filtering the 120 going into the board, is that what you're suggesting with the Siemens? And what did you mean by a "signal sucking" seems like it might defect the purpose. Thanks!

Tom j.

[dave w]

Say what filter would you use to filter only the 120 going into the board, winter will be here before you know it, and I still haven't corrected this.

Tom j.

I used one similar to this, but it does have some signal sucking characteristics.
http://www.meci.com/product_info.php/cPath/396/products_id/5600121

This filter from X10 should work well
http://www.x10pro.com/pro/pdf/xpf.pdf

Hi, doesn't the X10 Pro have to be wired directly into your control panel? I was thinking about the way Knightrider did it filtering the 120 going into the board, is that what you're suggesting with the Siemens? And what did you mean by a "signal sucking" seems like it might defect the purpose. Thanks!

Tom j.
[/quote]
BY "control panel", if you mean breaker panel, no the filter can be put anywhere there is physical room. I filtered the 120V going directly to the control / ignition board in the Lennox Pulse furnace. I used a filter (which MECI no longer stocks) similar to the MECI Siemans fliter I do not know for certain this filter will act as a signal sucker.

The signal sucking reference meant; in my application X10 signals were attenuated by the use of the filter in the furnace. However since I did not have any X10 on the dedicated branch to the furnace and the furnace was at one end of house with breaker panel at the other end of house, what ever attenuation I had at the furnace, did not (generally) effect X10 elsewhere in the house. So the $3.00 filter made economic sense.

If you are sure your furnace is noisy, and you have the physical room in the furnace cabinet, then the XPF is a better choice.

[tom j]

Thanks Dave yeah I was actually referring to the breaker panel. Thanks!!   


Tom j.