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I need help Building a Hotbox

post #1 of 4
Thread Starter 

Hi and thanks for taking time out of your day to help others.  I am in the process of building a hotbox.  It will basically be 2x2x8 and hold 220cm skis. I am considering a 120v 1550w heat strip from grainger.

http://www.grainger.com/Grainger/VULCAN-Stainless-Steel-Finned-Strip-Heater-4E268?Pid=search  

 

  I am considering the Johnson control a419 temperature control. http://www.etcsupply.com/johnson-a419abc1c-120240v-single-stage-temperature-control-p-111.html

 

I have not figured out the fan or fans yet or if i should cover the heating element with a shield to protect it from dripping wax? the inside will be insulated.  Any suggestions on any of these topics?

 

Also since it is so big and will have to be on the floor does anyone have any suggestions on a front door?   I will be mounting it on caster to help move it around.

 

Any plans or pictures would be very much aprreciated..

Thanks

post #2 of 4

I built a hotbox last fall that worked out well, here are the details:

 - 1"x2" box frame

 - 1/4" plywood outer skin, glued and screwed to box frame

 - 1" styrofoam insulation with reflective side facing in

 - 1000 watt hair dryer

    - mounted inside, at one end

    - hot air blowing into a 2" pvc pipe "header", mounted to the "ceiling", running the length of the box

    - 10 1/2" holes drilled for air flow, 5 on each side of the pipe

 - Thermostat from McMaster-Carr, $33, p/n 19155K16, this part number is for cooling, you will need to call McMaster and get the unit for heating, it is not listed in the catalog.

 - Full length door on one side, hinged and latched, same construction as the walls, 1/4" self-adhesive foam seal

 

Notes: The hair dryer works well and eliminates the need for additional box fans. I have measured the interior temps in several locations and the heat distribution is stable. The hair dryer does not over heat and once the inside is at temp is has about a 50% duty cycle, keeping the interior at about 130 f.

 

I originally mounted the hair dryer on the outside, but it pressurized the box and did not move any air - it did overheat then. Next, I vented the box to get the air flowing, but all the heat just vented out.

 

1/4" plywood and box frame is plenty strong and much lighter than 1/2" boxes I have read about.

 

Hope this helps you out. I'll try to answer any questions if you have them.

 

Cheers

post #3 of 4

I just rebuilt my totally ghetto hotbox, into more of a "suburban" box. It is on a bench an I simply used 1" rigid foam to make the box, attaching the sides with house wrap tape. Once all the sides were in place and taped it is plenty sturdy. Heat source is 3 light bulbs (2x100W and 1x150W) and a 120v computer fan from Radio shack. These are controlled by a Ranco controller (from etcupply). It's simple, didn't cost a lot, heats well and consistently with the Ranco controller. The "door" is simply hinged using tape, and is a friction fit. The skis rest on extra pieces of foam left over. I'll try to take some pictures.

post #4 of 4

 

 

Quote:
Originally Posted by rebotherebound View Post

I have not figured out the fan or fans yet or if i should cover the heating element with a shield to protect it from dripping wax? the inside will be insulated.  

Not sure what you're planning on doing with your skis, but there shouldn't really be any dripping wax...


 

Quote:
Originally Posted by rebotherebound View Post

 

Also since it is so big and will have to be on the floor does anyone have any suggestions on a front door?   I will be mounting it on caster to help move it around.

 

As for a door, Just put hinges and a handle the entire front side.


 

 

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