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HatchCraft! I have been reading your posts!!The duel thermostats are wired in series so either thermostat can turn off the heat element. One problem of the wafer thermostats are the micro switches are prone to stick in the on position as a result of normal wear. If the primary thermostat is set at 100 deg for example, the backup thermostat is set at 102. If the primary thermostat sticks on the backup thermostat will turn off the heat element when it temps hit 102 degrees protecting the eggs. Newer GQF cabinet incubators with wafer thermostats employ a solid state relay instead of the duel wafers. With this set up the thermostat only switches the relay on and off while the relay does the heavy work of turning on and of the heat element. Solid state relays have no moving parts so they do not wear and stick. You should be ok with a single thermostat they just don't last forever. Thee nichrome wire heat element with ceramic insulator are great for cabinets incubator. It takes 200 watts or more to heat a cabinet. They have a long service life and low thermal inertia for tighter temp control. Use a grounded wire guard like on the GQF cabinets.I uses them on some of my cabinets and they are safe and effective.

We will not be using the cabinet for hatching at all, so the life of the wafer should be longer than usual, would be my guess. The wafs in my coolerbators that I incubate and hatch in are pretty dull and used looking and thats from the high humidity and chicken fluff during hatch.
I was reading one of the posts about which way to run the fan back into the back compartment and down and out through the bottom, or out front and down... not quite sure I understood which is best, that was a very informative thread for sure! And the fan, how powerful CFM is it called? and is one or two fans better? and if two I would need to heating sets? The GFQ fan doesnt have details on the replacement part for me to see what power they have.
Thank you so much!!!!!