Do I need a heater assembly doubler?

RVNewsletter · Post by **RVNewsletter** » Sat Oct 18, 2008 6:31 pm

I bought what I guess is one of the last EPM Heater boxes (I hear they've gone out of business). Question: Since it bolts to the firewall, do I need to make a doubler for the cabin side of the firewall.

Somewhere along the line, I thought I recalled the advice that whenever you hang anything off the firewall, you need a doubler.

weezbad · Post by **weezbad** » Sat Oct 18, 2008 6:36 pm

couldnt hurt, but i blindly follow plans...looking back i though it was in need of a doubler...but the plans didnt show it.

so i didnt do one.

smithhb · Post by **smithhb** » Sat Oct 18, 2008 10:04 pm

I didn't either... The SS EPM model is really thin sheet and when I bolted it to the firewall (with red RTV) it became really solid.

cjensen · Post by **cjensen** » Sun Oct 19, 2008 9:26 am

I bought the EPM model that uses two FW holes to actuate, and my came with a cabin side doubler...does the single hole one not have this?

RVNewsletter · Post by **RVNewsletter** » Mon Oct 20, 2008 7:23 am

Maybe it's a bigger unit. I have a single-hole model that I bought from Avery. It comes with no doubler, nor any instructions for a doubler. I put it on yesterday. I made a doubler, then decided that since it's pretty close to the firewall recess -- which is reinforced -- I wouldn't need it.