I've a dishwashing job at a restaurant, I don't like to wear those annoying rubber gloves that make my hands sweat. Is it really necessary to wear gloves?
Within the AHU ther are whats called Dampers a device that is designed to stop the spread of fire normally on the air intake side of the ahu as opposed to the extract side of the system. The BMS is where the system programming is and there are many variations of different logics and situations. Simply you will have a smoke detector of some kind in the AHU, and when smoke is detected it sends a signal to the BMS and closes the Damper and / or the Air intake Fan. Probebly from the design of the system smoke detectors are placed in the higher risk places of the system. Hope this helps, I work on these systems all the time. Neil
If you use 1 1/4 pipe schedule 40 and keep it under 48 you should be able to hang about 50 or so pounds on the pipe. If you go past that, it will sag pretty badly. Be sure to draw out what you want to build so you get an accurate idea of what types of fittings you will need. And above all, dry fit it first to make sure it works before you start gluing it together.
