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Blower door - Motion Detectors - CCTV Wireless Camera by efvf vdvV





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Blower door - Motion Detectors - CCTV Wireless Camera by
Article Posted: 03/14/2011
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Blower door - Motion Detectors - CCTV Wireless Camera


 
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Uses of blower-door testing Blower doors can be used in a variety of types of testing. These include (but are not limited to): NFPA Clean Agent Retention testing (this type of testing is usually described as a door fan test rather than a blower door test) Testing residential houses for air tightness Testing buildings for compliance with standards for energy efficiency, such as those by the Leadership in Energy and Environmental Design (LEED) and Passive House/Passivhaus. Testing building envelopes and window frames for water tightness and rain penetration How blower-door tests work A basic blower-door system includes three components: a calibrated fan, a door-panel system, and a device to measure fan flow and building pressure. The blower-door fan is temporarily sealed into an exterior doorway using the door-panel system. The fan is used to blow air into or out of the building, which creates a small pressure difference between inside and outside. This pressure difference forces air through all holes and penetrations in the building enclosure. The tighter the building (e.g. fewer holes), the less air is needed from the blower door fan to create a change in building pressure. Blower-door airtightness measurements are presented in a number of different formats, including but not limited to: Air flow CFM50 is defined as the air flow (in cubic feet per minute) needed to create a 50-pascal pressure change in the building envelope. CFM50 is one of the most basic measurements of airtightness. Air flow measurements are sometimes referenced to different building pressures such as 25 or 75 pascals. Air changes per hour at 50 pascals To compare relative airtightness of buildings, it is useful to normalize measurements for the size of the building. This allows easy comparison of various sized buildings to each other, or to program guidelines. One of the most common ways to normalize building airtightness is to calculate the number of times per hour the total volume of the enclosure is changed, when the enclosure is subjected to a 50-pascal pressure difference. To calculate air changes per hour, the total volume of the enclosure is required in addition to the CFM50 measurement. It is also common to use the building enclosure surface area to normalize airtightness measurements. A pressure of 50 Pa is equal to 0.2 inches (0.51 cm) of water column. Leakage area Leakage area estimates are a useful way to visualize the cumulative size of all leaks or holes in the building enclosure. Estimated leakage areas can also be used in infiltration models to estimate natural infiltration rates (i.e. the air change rate under natural weather conditions). To accurately estimate leakage areas, it is best to conduct the blower-door test over a wide range of building pressures (e.g. 60 Pa to 15 Pa). There are a variety of standard calculation methods used to calculate leakage areas. Leakage area per square area Leakage area estimates can also be normalized for the size of the enclosure being tested, For example, the LEED Green Building Rating System has set an airtightness standard for multifamily dwelling units of 1.25 square inches (8.1 cm2) of leakage area per 100 square feet (9.3 m2) of enclosure area, to control tobacco smoke between units. This is equal to 0.868cm/m. Manufacturers There are three main manufacturers of blower doors. Energy Conservatory makers of the Minneapolis Blower Door Infiltec Retrotec Energy Innovations Ltd. References ^ Siemens Building Technologies Home Energy Guide Categories: Heating, ventilating, and air conditioning

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