I'm building a DIY lab round flask heater using a fiber glass 250mL GLAS-COL M102, 180 Watts heater mantle. The temperature will be controlled via a PID controller and a K-type thermocouple. Since the metal outer shield of the heater also gets hot during the operation and the PID controller will also be placed inside the housing I need to remove the heat from the inside. I have two types of axial cooling fans in my possession (picture shown in attachment). Now, the No. 1 type fan is quite powerful, noisy and the air has a lot of force to it. But you can feel the air flow pressure only unto 2-3 ft from the fan. The No.2 fan though not very loud or powerful, the air flow can be felt even up to 5-6ft away though the force from the air is not quite high like the former. I want to use a 115VAC fan to avoid using another circuit if I were to go with a 12VDC fan.
I'm assuming these are shaded pole motor fans. Can the speed of these fans be controlled via a simple light dimmer or the need a specific motor speed controller (maybe a triac controller)? Also if I used a light dimmer and wanted a slower speed to reduce noise, will the motor stall after a certain point and cause it to overheat?