Need longer bracket to support vertical 3" pellet chimney pipe stack (from side of house)

[doorknob]

My pellet stove's 3" diameter exhaust pipe passes horizontally through the outside wall of the house (through a thimble or whatever they call the thru-wall fitting). Currently it terminates about a foot away from the siding in a horizontal exhaust vent.

I recently installed a heating oil tank in my basement, and there is a vent pipe from the oil tank that exits the basement about a foot or two away from the pellet stove's exhaust pipe. To meet code, I believe that I must keep the pellet stove's exhaust outlet at least ten feet from the oil tank vent.

My plan is to remove the exhaust fitting from the thru-wall fitting, replace it with a cleanout Tee (http://www.lowes.com/pd_53936-76845-AC-3067_4294934297+4294809884_40_?productId=3134669&Ns=p_product_prd_lis_ord_nbr|0||p_product_quantity_sold|1&pl=1&currentURL;=/pl_Simpson+DuraVent_4294934297+4294809884_40_?Ns=p_product_prd_lis_ord_nbr|0||p_product_quantity_sold|1) and then to go up from there with ten feet of 3" pipe, to a 90-degree fitting at the top, a 1-foot section, and then finally the exhaust fitting.

I need to support the pipe (from the siding of the house) near the top with some kind of bracket. I got a Simpson Dura-Vent bracket (similar to http://www.lowes.com/pd_62710-76845...avent&pl=1&currentURL;=/pl__0__s?Ntt=duravent but without the third support leg), however it is not long enough - I need an additional 8" (beyond the length of the bracket).

So, can someone point me to either a longer-legged bracket, or an extension bracket to add to the one that I have?

I have considered looking for some stainless steel sheet metal stock and fabricating my own extender, but surely I'm not the only person who has faced this problem...

 

[stallau]

I had the same thing with my piping because I have a propane tank near my vent. I used the duravent bracket but bought a 1/8 aluminum which is about 1" wide at lowes. I basically cut it to the length I needed and then made new L brackets to reach out to where the pipes are (I needed about 5 inches in length) and then just drilled them for screws as needed. If you want some pics let me know and I'll try and get some before the sun sets

 

[doorknob]

Thanks for the offer of photos - no need to go to any trouble, but it's always useful to see what someone else has done in a similar situation...