The heating and ventilation within any industry will be of outmost importance in helping keep the performance and productivity high. HVAC units therefore want to be kept safe and secure, with strong HVAC hinges and handles to keep the doors shut and keep the unit protected from outside interference. It'll need to be designed to have the temperature and moisture of the area in mind, to ensure that rust and spoilage of materials do not happen, or at least will not happen so easily. Though there's always the potential for sabotage and accidents to happen too, which also needs to be taken in consideration when designing the access to the HVAC unit, so making sure that the hinge for HVAC cannot be broken so easily by blunt or sharp tools can be important as well. After all, there's no lack of people looking to destroy just for the fun of it and at times it may even be that a less moral competitor wants to sabotage.
Regardless of the industry you're planning on designing access solutions for, you need to take proper time and care to consider all the circumstances and potential harm that the protective cabinet may receive and that everything remains sealed. Even the handle and hinge for HVAC units matters in that regard and especially if the unit is stored outside. There's also the matter of air pressure and whether it is positive or negative within to keep in mind and help ensure that the handle and hinge are designed based on whichever it is.