Next, assemble your frame based on the dimensions of your HEPA filter. Ensure the structure is stable and robust enough to hold the weight of the fan and filters. Attach your pre-filter to the fan intake using duct tape or another secure method. Position your fan on the frame and secure it in place with screws. The fan’s purpose is to provide the fan exchange, pushing air through the filters and out into the working area. Mechanical ventilation is indicated when the patient8217;s spontaneous ventilation is inadequate to maintain life. It is also indicated as prophylaxis for imminent collapse of other physiologic functions, or ineffective gas exchange in the lungs. Because mechanical ventilation only serves to provide assistance for breathing and does not cure a disease, the Patient8217;s underlying condition should be correctable and should resolve over time. In addition, other factors must be taken into consideration because mechanical ventilation is not without its complications (see below)