BY KEVIN ROBERTS When a water pump moves coolant through the cooling system it does not contribute primarily to the pressure in the system....
READ MOREThe Principle of Latent Heat
Sep 8, 2026 | Apparatus Components, Articles, Equipment, Features, Fire Apparatus, Rigs, Roberts
In the first article on apparatus HVAC systems, I mentioned that latent heat disappears. Disappearing does not mean that the heat ceases to...
READ MOREHVAC Systems: So, What Is a Micron, Anyway?
Jul 13, 2026 | Apparatus Components, Articles, Features
The part salesman gives a micron rating for his fuel filter. Your high school physics teacher told you that the sun’s gravity at the distance...
READ MOREWhat the HVAC System Needs
May 8, 2026 | Apparatus Components, Articles, Features, Fire Apparatus
By Kevin Roberts Last time we discussed what heat is. If you haven’t already, you should read that one first. There are many ways to...
READ MOREIntroduction to Emergency Vehicle HVAC: What is Heat?
Apr 10, 2026 | Ambulances, Apparatus Components, Articles, Features, Fire Apparatus, Fire Command Vehicles, Hazmat Trucks, Ladder Trucks, Pumpers
One of the occupational hazards of an emergency vehicle technician (EVT) Trainer who emphasizes basic principles is the complaint that the...
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