Tunnel heat

[dspender]

I understand some have replaced some of the aluminum scat tube attachments for stainless steel units to help control tunnel heat. Is the unit builders are replacing the Vent TG-10- Cabin heat Selector boxes that attach to the firewall? I am getting ready to install the Vent DL-03 scat tube flange in the inboard seat rib subassembly. I don't recall that this would need to be replaced with a stainless steel piece. Any other pieces of this scat tube parts that should be replaced with stainless steel?

 

[BobTurner]

The replacement is mostly so that in the event of an engine fire this box won't melt.
Some builders insulate their tunnels.

 

[dspender]

Is the vent builders are replacing the cabin heat selector attached to the firewall only?

 

[Mike S]

Heat selector valve, attaches to firewall with two -3 bolts-----this is all that I know of that folks are changing out.