Blower door

In some texts guidance is given to estimate and evaluate the leakage of buildings and building components. The multizone airflow model can also be used to adjust the assumed conductances to an overall building leakage, measured by blower door technique, for example. 

When the blower door was turned off the soil probe pressures returned to zero, indicating that the observed pressure field in the soil was directly related to basement depressurization. 

The enclosure for the clean agent system should be examined for openings and tested to ensure that the agent concentration can be maintained. Currently, the preferred method is using a blower door fan unit and smoke pencil. 

Blower Door - A device used by energy auditors to pressurize a building to locate places of air leakage and energy loss. 

The compressor or blower installation in a typical refinery or chemical process unit is not out-of-doors completely. Some form of shelter often is provided, ranging from only a roof to a completely closed building. When process equipment such as a centrifugal gas compressor, which is not hazardous in normal operation, is present in the shelter, the hazard classification depends on the extent to that which the shelter restricts ventilation. The extent of the shelter provided determines the area classification and the type of motor enclosure that should be applied. 

Portals have been developed with and without doors. Open portals without doors permit easy passage for passengers and a less claustrophobic environment. Closed portals with doors offer access control and more efficient sample collection. Figure 11.12 shows a portal with doors and Figure 11.13 shows the internal components for collecting and analyzing sample. For this particular portal the airflow is done in a closed loop using a blower and concentrator without interaction with external air that can dilute the sample concentration. 

Design requirements called for a still to supply an average household (250 to 500 gallons per day) be sized to pass through a door 26 inches wide be thermally self-sufficient—i.e., stay at operating temperature without additional heat—and start and stop on demand without supervision. The Aquastill (9) meets these specifications on the laboratory floor and in the field on noncorrosive waters. For prolonged use on sea water, changes will be required in construction materials for the steam blower and residue extraction pumps. 

Barometric pressure is detected by bellows against a reference, which is provided by a sealed-in vacuum. Exposing the instrument to direct sunlight, radiant heaters, or to direct drafts, such as from open windows or doors, should be avoided. Air temperature is measured with a platinum resistance thermometer. It is placed in a long tube that has been painted white on the outside to reflect solar radiation. A small blower pulls ambient air into the tube and across the thermometer. 

In an enclosure that operates under slightly negative pressure, or in one that goes to negative pressure when a gas is detected and fans or blowers start, at least one of the escape doors should open inward. Negative pressure inside the enclosure will make opening the door more difficult in an emergency. A knock-in panel in the door will help circumvent this drawback. 

Start and refill the gas generator only out-of-doors Do not linger unnecessarily near the blower discharge. Do not let engines run in garages. 

The door to the stairwell bursts open. Miss Peach limps, one arm is wrapped around Scarlet, the other carries the candle. They begin to climb the stairs, HUPPING and PUPPING. A group of three PEOPLE come charging down the stairs. They have party blowers in their mouths and... 

Figure 10.4 Nonstick feature of fluorocarbon finishes makes them useful for products such as saws, fan and blower blades, door-lock parts, sliding- and folding-door hardware, skis, and snow shovels. (Courtesy ofE. I. Du Pont de Nemours Company.)...

An internal power supply module provides the power needed by certain components within a fuel cell system. The components include sensors, control boards, pumps, fans, blowers, compressors, solenoid valves, contactors, switches, and so on. The IPM also provides the power to start the fuel cell system and helps carry some load when the fuel cell stack is inadequate to handle a sudden load jump. There are many types of sensors in a fuel cell system, such as the H2 concentration sensors, the H2 pressure sensors, the fluid flow rate sensors, the coolant-level sensors, the temperature sensors, the current sensors, the voltage sensors, the door-open sensors, the vibration sensors, and the flooding sensors. These sensors monitor the corresponding parameters to indicate the situation of the entire fuel cell system. The control boards may include a main board for controlling the system and several sub-boards for controlling various modules discussed in this chapter. Pumps, fans, blowers, compressors, solenoid valves, contactors, and switches all require power to perform the corresponding functions. 

Dilution ventilation utilises natural convection through open doors, windows, roof ventilators etc. or assisted ventilation by roof fans or blowers which draw or blow in fresh air to dilute the contaminant. With both of these systems the problem of providing make-up air at the proper temperature, especially during the winter months, has to be consider. ... 

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