Which Heat Box?

[DanH]

Originally Posted by 2theskyy

Can you provide which SS rivets you used for your entire firewall, heat box?

Any stainless steel blind rivet or monel driven rivet will attach a heat box.

My own firewall has an insulation overlay on the engine side and no heat box. No melted rivets, no hole.
.

[lr172]

Originally Posted by 2theskyy

Can you provide which SS rivets you used for your entire firewall, heat box?
Thank you in advance.

I used SS screws with nut plates. much easier to source.

[Webb]

I haven’t unpacked my firewall forward kit yet.
So I ask does a heat box come with it and if so, aluminum or stainless?

I read the overview on ACS and it has Dan’s fingerprints all over it.

[DanH]

Originally Posted by Webb

I haven’t unpacked my firewall forward kit yet.
So I ask does a heat box come with it and if so, aluminum or stainless?

I read the overview on ACS and it has Dan’s fingerprints all over it.

Not me. I believe those are made by Aviacomp.

http://www.aviacompinternational.com/index.html

[2theskyy]

Originally Posted by DanH

Any stainless steel blind rivet or monel driven rivet will attach a heat box.

My own firewall has an insulation overlay on the engine side and no heat box. No melted rivets, no hole.
.

Insulation is a great idea, any pics of your firewall? I’m planning to keep fwf clear of as many items as possible but I didn’t think there was enough room for a true fireproof insulation install.
Thanks for creating the conversation.

Disregard, I just searched past threads in this conversations. Great info!!

[RV7 To Go]

Originally Posted by VA Maule

Here’s the one that you want . Make sure you get the stainless steel version

Same SS one I used. Installed with SS screws and platenuts. I also used 3M Firestop 2000 to seal it on the firewall. Cable is on the cabin side so no worry about keeping the door closed. Used this on my 7 and same on the 8. Dual heat muffs in series in order to get enough heat for our Canadian winters.

[riseric]

I used 2 stainless AN3 bolts and hardware as per instructions.
With 3M FireBarrier of course.

[claycookiemonster]

I got one of the smaller 45 degree heat boxes as recommended.

https://www.aircraftspruce.com/catal...aterbypass.php

Looks great! Curiously, while the holes on the box match the holes already in the firewall, the box can't be installed using those holes because the box would interfere with structure on the aft side of the firewall. Did anyone else find that? I can only find one way to install the box, and it's vertically with the heated air entering from below, and so the unused air will be exhausted upwards, against the general flow of air exiting the cowl at the bottom. That seems a bit odd, but maybe not fatal.

My next question, is how have you guys set up the scat tubing to combine cool outside air with heated air? Have you added another valve to decrease outside air when you really want warmth, because even when the heat box is fully HOT, it will still mix with fully COLD air from the outside, right? I've learned metal working and fiberglassing and wiring. I guess it's time for HVAC training.

[claycookiemonster]

I don't know why this heat issue has confused me so much, but I think I'm getting it now. One final jeopardy question, are you guys installing scat tubing to route and direct the hot air aft of the firewall, or simply letting it loose there? The outlet on the -8 firewall is outboard of the left rudder pedal, so it seems like that foot will get toasty while the right foot will freeze.