p30 build - ventilation design

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DWags541
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2012/02/25 17:24:49 (permalink)

p30 build - ventilation design

Hey Everyone,
I am doing a food truck build and currently in the design phase. I've scanned through a lot of posts by current members and have some questions, some that may have been asked before, and also some offerings from my own experiences.
 
I just wanted to throw out there that a free program called google sketchup can be very useful for designing a 3d model of your build. It takes a little time to get used to it, but once you do, it is pretty user friendly. As I get site permissions, I will post my images and models for you all to browse and comment on. For now, I guess I'll try to find another host for images.
 
Right now, I am working on the ventilation aspect of the build. At first, I figured on having an 8' hood with AC exhaust fan on the side of the van (interior length 10' 10"), but one metal guy I ran the idea past brought up the issue of roof weight and overall structural integrity, as well as the integrity of the roof (leaks). This was a previous consideration, but I didn't see any other way at the time. Now, I am looking into wall mounted ventilation. I've seen this style incorporated on Southern California food truck builds. Most of those have their griddle at the back of the truck and wall fans mounted above it, pushing exhaust out the back. Presumably, these are 12v fans, which I would find ideal for my setup.
 
I've seen some discussions and links to fans, on sites like global industrial <sp?>, and the southern cali truck builder pages. I also saw a couple members using 120v fans, presumably with inverter systems or ultimately for use with onboard generators. Since my truck is small, I am not considering a generator and I am favoring a battery bank. I imagine I will use an inverter or at least have it available. I know 12v fans are used with RVs and there is also the option of car radiator fans (12v).
 
I know a lot of these build projects are done with keeping costs down. But has anyone considered incorporating a 12v RV fan like MaxxFan into their build? I have two of these that I purchased when I had a different design in mind. And I know I will use them at some point for something if not for my exhaust ventilation in my truck. One potential argument I could see is that there are plastic or polycarbonate components to the MaxxFans. I would be curious to know if they would or could hold up. I also considered just mounting them on my roof for extra ventilation, as they are designed for roof mounting, I would expect the integrity of the roof (leakage) not to be affected. Just wondering if people have researched this option. Paperwork on my MaxxFan (Deluxe model 7000-7500) says at high speed, it can move over 900 cfm, 1223 rpm, using 4.2 amps. The model I have has motorized opening and closing vent cover which I think is nice. But ultimately, I don't want to marry the idea of having these in close proximity to food cooking exhaust and discover later that they do not clean well, or hold up to higher temps. (btw, regarding temps, I would imagine these RV fans have to hold up to high heat experienced in a van that has the greenhouse effect going on inside of it during the summer)
 
Anyway, whats the word on 12v motor fan operations for wall mount ventilation? Has anyone gone this route? I suppose buying the supplies from that company Armenco or Pacific Food Trucks is ideal because it is what they use. My BTUs are going to be about 60,000. I researched that one needs 100 cfms per 10,000 BTU.
 
Thanks for input. I look forward to contributing to these forums.
 
Dave
 
Chevy p30, 1985, interior L:10' 10" W:6'6" H:~6'4"
post edited by DWags541 - 2012/02/25 17:48:17
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