DE2743107A1 - Quick-closing air conditioning damper control - has gas sensors in outside air duct operating damper and fan controls - Google Patents

Quick-closing air conditioning damper control - has gas sensors in outside air duct operating damper and fan controls

Info

Publication number
DE2743107A1
DE2743107A1 DE19772743107 DE2743107A DE2743107A1 DE 2743107 A1 DE2743107 A1 DE 2743107A1 DE 19772743107 DE19772743107 DE 19772743107 DE 2743107 A DE2743107 A DE 2743107A DE 2743107 A1 DE2743107 A1 DE 2743107A1
Authority
DE
Germany
Prior art keywords
quick
fan
flap
air conditioning
switching device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE19772743107
Other languages
German (de)
Other versions
DE2743107C2 (en
Inventor
Nichtnennung Beantragt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kessler and Luch GmbH
Original Assignee
Kessler and Luch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kessler and Luch GmbH filed Critical Kessler and Luch GmbH
Priority to DE19772743107 priority Critical patent/DE2743107A1/en
Publication of DE2743107A1 publication Critical patent/DE2743107A1/en
Application granted granted Critical
Publication of DE2743107C2 publication Critical patent/DE2743107C2/de
Granted legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B13/00—Special devices for ventilating gasproof shelters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/0001—Control or safety arrangements for ventilation
    • F24F2011/0002—Control or safety arrangements for ventilation for admittance of outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/50—Air quality properties
    • F24F2110/52—Air quality properties of the outside air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

The control device fitted to air conditioning plant prevents entry of poisonous gases into building. The device uses a set of gas sensors (5) fitted in the outside air duct (2) between outside air louvre (3) and dust filter (6). The signal from the sensors is fed into controller (15) which operates the quick-closing action of supply air damper (13) and starting controls of fan (8). The individual sensors (5) are designed to react to various types of poisonous gas.

Description

Vorrichtung zur Betätigung von Schnellschlußklappen in Belüftungsanlagen und in KlimaanlagenDevice for actuating quick-closing flaps in ventilation systems and in air conditioning systems

Es sind Schnellschlußklappen beispielsweise als Feuerschutzklappen bekannty Diese dienen dazu, im Brandfalle einen luftführenden Kanal zu schließen, durch den Hitze oder Rauch in weitere Räume eindringen könnte ο Diese Schutzklappen werden z. B0 von Federn in Offenstellung gehalten, an deren anderem Ende beispielsweise eine Schmelzlotverbindung angehängt ist, die unter Hitzeeinwirkung schmilzt, sodaß sich die Klappe selbsttätig schließt (P 23 61 729.0).There are quick-closing flaps known, for example, as fire protection flaps. B 0 held in the open position by springs, at the other end of which, for example, a fusible link is attached which melts under the action of heat so that the flap closes automatically (P 23 61 729.0).

Nun sind Belüftungs- und Klimaanlagen eine Gefahrenquelle, um in Gebäude innerhalb von Sekunden Giftgase einzuführen, die die im Gebäude befindlichen Personen in verschiedenster Weise schädigen, bzw. zeitweise narkotisieren, aber auch lebensgefährlich vergiften. Hierzu ist es nur erforderlich, in den Ansaugkanal für Frischluft eine entsprechende Gasbombe hineinzuwerfen oder auch die Gase durch Schläuche einzuführen. Now ventilation and air conditioning systems are a source of danger to get into buildings to introduce poisonous gases within seconds, which damage the people in the building in various ways, or at times narcotize, but also poison life-threatening. For this purpose, it is only necessary to have a corresponding one in the intake duct for fresh air Throwing a gas bomb into it or introducing the gases through hoses.

Für die Geschwindigkeit, mit der gasförmigeKampfstoffe sich in einem klimatisierten Gebäude ausbreiten, kann von folgenden Zeitverhältnissen ausgegangen werden, denen folgende Annahmen zugrunde liegen % The following time ratios can be assumed for the speed at which gaseous warfare agents spread in an air-conditioned building, based on the following assumptions %

Luftgeschwindigkeit in der Zentrale 3 m/sAir speed in the control center 3 m / s

Luftgeschwindigkeit in den vertikalen Steigeschachten 25 m/sAir speed in the vertical riser ducts 25 m / s

Luftgeschwindigkeit in den horizontalen Verteilschächten 10 m/sAir speed in the horizontal distribution shafts 10 m / s

9098U/017S9098U / 017S

27A310727A3107

Unter diesen Voraussetzungen würde sich ein im Ansauggitter einer Lüftungs- oder Klimaanlage eingegebener gasförmiger Kampfstoff bei einem 12-geschossigen Verwaltungsgebäude vom L bis 12. Geschoß in ca. 5-7 sek. ausbreiten. Nimmt man darüber hinaus eine gewisse Verzögerung bei der Raumdurchmischung im Auslaß an, so kann davon ausgegangen werden, daß der gasförmige Kampfstoff nach ca. 10 - 15 sek. im Raum wirksam wird.Under these prerequisites, a gaseous warfare agent introduced into the intake grille of a ventilation or air conditioning system would become involved a 12-storey administration building from L to 12th storey in approx. 5-7 sec. spread. In addition, if one assumes a certain delay in the mixing of the space in the outlet, then it can it can be assumed that the gaseous warfare agent after approx. 10-15 sec. takes effect in the room.

Es ist nun von Gebäuden für den zivilen Luftschutz her bekannt, in deren Luftzuführungen Filter gegen schädliche Gase einzubauen, die standig in den Frischluftstrom eingeschaltet sind oder nur bei drohender Gefahr eingeschaltet werden. Derartige Filteranlagen bedeuten einen hohen Aufwand an Investitions- und Betriebskosten, da der gesamte Außenluftanteil ständig über die Filteranlage in das Gebäude eingeführt werden muß. Es ist andemseits nicht üblich, Belüftungsanlagen und Klimaanlgen in Verwaltungsgebäuden, Kaufhäusern, Schulen, Kliniken und dergleichen mehr mit derartigen Filteranlagen zu versehen«It is now known from buildings for civil air defense, in their Air intakes incorporate filters against harmful gases that are constantly flowing are switched on in the fresh air flow or only switched on in the event of imminent danger. Such filter systems mean one high investment and operating costs, as the entire proportion of outside air is constantly introduced into the building via the filter system must become. On the other hand, it is not common to have ventilation systems and air conditioning systems in administrative buildings, department stores, schools, clinics and the like to provide such filter systems "

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zu entwickeln, die das Eindringen von Gasen in die Räume eines klimatisierten Gebäudes verhindert.The invention is based on the object of developing a device which prevents the penetration of gases into the rooms of an air-conditioned building.

Die Aufgabe wird nach der Erfindung durch die in den Ansprüchen 1 bis 8 gekennzeichneten Erfindungsmerkmale gelöst«,The object is achieved according to the invention by the in claims 1 to 8 identified features of the invention solved «,

Der Begriff Gasanzeigesonde soll Geräte bezeichnen, die durch Gas auf chemische und/oder physikalische Weise einen elektrischen oder pneumatischen Impuls erzeugen, der eine Schaltvorrichtung betätigt. Diese Son-The term gas indicator probe is intended to denote devices that operate through gas chemical and / or physical way an electrical or pneumatic Generate pulse that actuates a switching device. This sun

9098U/01759098U / 0175

den werden in den Luftkanal zweckmäßig in einem Abstand von einigen Metern von dem Außenluft-Ansauggitter und nahe der Belüftungs- bzWo Klimazentrale angeordnet, damit sie nicht etwa durch Sprengwirkung zerstört werden. Aus dem gleichen Grund wird die Schnellschlußklappe bevorzugt auf der Ausgangsseite des Zentralgerätes insbesondere bevor der Hauptkanal in das Gebäude-seitige Kanalsystem aufspaltet, angebracht. Wenn lange Wege zwischen Ansauggitter und der Zentrale zur Verfügung stehen, kann man die Schnellschlußklappe auch auf der Eingangsseite eines Zentralgerätes anordnen.which are expediently in the air duct at a distance of a few Meters from the outside air intake grille and close to the ventilation or where Air conditioning center arranged so that they are not destroyed by explosive effects. The trip valve is used for the same reason preferably on the output side of the central device, especially before the main duct splits into the building-side duct system, appropriate. If there are long distances between the intake grille and the control center, you can also use the quick-closing flap on the Arrange the input side of a central device.

In der Zeichnung ist die Erfindung an Hand einer Klimaanlage schematisch dargestellt. In the drawing, the invention is shown schematically on the basis of an air conditioning system.

In der Außenwand 1 eines Gebäudes ist als Einlaß für Frischluft in den Luftkanal 2 das Ansauggitter 3 angeordnet. Vor der KlximazentraLe 4 sind im Kanal 2, über dessen Querschnitt verteilt, mehrere Gasanzeigesonden 5 eingesetzt» Die Klimazentrale 4 besteht in bekannter Weise aus einem Filter 6, einem Erhitzer 7, einem Ventilator 8 und einem Kühler 9, die sämtlich in einem Kastengerät untergebracht sind. Kurz hinter der Zentrale 4 steht im Zuluftkanal 10 die Schnellschlußklappe An die Zentrale 4 schließt sich der Zuluftkanal 10 an und an diesen ein Vertikalkanal 11, von dem aus die einzelnen Stockwerke über Seitenkanäle 12 versorgt werden, in denen Brandschutzklappe 14 angeordnet sind.In the outer wall 1 of a building is as an inlet for fresh air in the Air duct 2, the intake grille 3 arranged. In front of the KlximazentraLe 4 are in channel 2, distributed over its cross-section, several gas indicator probes 5 used »The air conditioning center 4 consists in a known manner of a filter 6, a heater 7, a fan 8 and a Cooler 9, all of which are housed in a box unit. Shortly behind the control center 4, the quick-closing flap is located in the supply air duct 10 The supply air duct 10 is connected to the control center 4 and is followed by a vertical duct 11, from which the individual floors are connected via side ducts 12 are supplied, in which fire damper 14 are arranged.

Die Gasanzeigesonden 5 sind mit der Schaltvorrichtung 15 leitend verbunden und diese mit der Schnellschlußklappe 13 und dem Ventilator 8.The gas indicator probes 5 are conductively connected to the switching device 15 and this with the quick-closing flap 13 and the fan 8.

Falls ein Giftgas in den Kanal 2 gelangt, wird dieses von einer hierauf abgestimmten Sonde 5 erfaßt und von dieser wird ein elektrischer oderIf a poison gas gets into channel 2, it will be released from there matched probe 5 detected and from this is an electrical or

9098U/01759098U / 0175

pneumatischer Impuls an die Schaltvorrichtung 15 gegeben. Die Schaltvorrichtung löst nun unmittelbar den Schließmechanismus der Schnellschlußklappe 13 aus und gleichzeitig oder unmittelbar darauf schaltet sie den Ventilator 8 aus. Auf diese Weise wird verhindert, daß das Giftgas in die verschiedenen Räume des Gebäudes gelangt.a pneumatic pulse is given to the switching device 15. The switching device now triggers the closing mechanism of the quick-action flap 13 and switches at the same time or immediately thereafter turn the fan 8 off. This prevents the poison gas from entering the various rooms in the building.

Die Schließzeit einer Schnellschlußklappe 13 muß so bemessen werden, daß im Hinblick auf mögliche Schäden in der Klimazentrale und/oder im Kanalsystem keine unzulässig hohen Druckstöße beim Schließvorgang entstehen.The closing time of a quick-closing flap 13 must be measured in such a way that that with regard to possible damage in the climate control center and / or no impermissibly high pressure surges occur in the sewer system during the closing process.

909814/017$909814/017 $

Claims (1)

Anm. : Kessler + Luch KG- i;tv< h tf Rathenaustraße 8 6300 GießenNote: Kessler + Luch KG- i ; tv <h tf Rathenaustraße 8 6300 Giessen 21. September 1977 Dr.Lo/hSeptember 21, 1977 Dr Lo / h AnsprücheExpectations [ 1.1 Vorrichtung zur Betätigung von gasdichten Schnellschlußklappen in Belüftungsanlagen und in Klimaanlagen, dadurch gekennzeichnet, daß in dem Frischluft-führenden Kanal (2) mit Abstand von dem Ansauggitter (3) und vor dem Belüftungs- bzw. Klimazentralgerät (6, 7, 8, 9) Gasanzeigesonden (5) angeordnet sind, die mit einer Schaltvorrichtung (15) leitend verbunden sind, die mit dem Schalter des Ventilators (8) und dem Schalter der Schnellschlußklappe (l3) gekoppelt ist.[1.1 Device for actuating gas-tight quick-release flaps in ventilation systems and in air conditioning systems, characterized in that in the duct (2) carrying fresh air at a distance from the intake grille (3) and gas indicator probes (5) are arranged in front of the central ventilation or air conditioning unit (6, 7, 8, 9), which are equipped with a switching device (15) are conductively connected, which is coupled to the switch of the fan (8) and the switch of the quick-action flap (l3). 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß mehrere Gasanzeigesonden (5), die auf verschiedene Gase ansprechen, angeordnet sind.2. Apparatus according to claim 1, characterized in that several gas indicator probes (5) responsive to different gases are arranged. 3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Schaltvorrichtung (15) gleichzeitig auf Ventilator (8) und Schnellschlußklappe (13) einwirkt.3. Apparatus according to claim 1, characterized in that the switching device (15) acts simultaneously on the fan (8) and the quick-release flap (13). 4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Schaltvorrichtung (l5) so ausgelegt ist, daß sie zuerst das Schließen der Schnellschlußklappe (13) bewirkt und dann den Ventilator (8) ausschaltet.4. Apparatus according to claim 1, characterized in that the switching device (l5) is designed so that it first causes the quick-closing flap (13) to close and then switches off the fan (8). Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Schnellschlußklappe (l3) auf der Ausgangsseite des Zentralgerätes (6, 7, 8, 9) angeordnet ist.Device according to one of Claims 1 to 4, characterized in that that the quick-closing flap (l3) is arranged on the output side of the central device (6, 7, 8, 9). 9098U/0175 ORIGINAL INSPECTED9098U / 0175 ORIGINAL INSPECTED 6. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Schnellschlußklappe (l3) zwischen den Gasanzeigesonden (5) und dem Zentralgerät (6, 7, 8, 9) angeordnet ist.6. Device according to one of claims 1 to 4, characterized in that that the quick release flap (l3) between the gas indicator probes (5) and the central device (6, 7, 8, 9) is arranged. 7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Verbindung zwischen Gasanzeigesonden (5), Schaltvorrichtung (15) und Ventilator (8) und Schnellschlußklappe (13) elektrisch erfolgt.7. Device according to one of claims 1 to 6, characterized in that that the connection between gas indicator probes (5), switching device (15) and fan (8) and quick-closing flap (13) takes place electrically. 8. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Verbindung zwischen Gasanzeigesonden (5), Schaltvorrichtung (l5) und Ventilator (δ) und Schnellschlußklappe (l3) pneumatisch erfolgte8. Device according to one of claims 1 to 6, characterized in that that the connection between gas indicator probes (5), switching device (l5) and ventilator (δ) and quick-action flap (l3) was made pneumatically 9098U/017S9098U / 017S
DE19772743107 1977-09-24 1977-09-24 Quick-closing air conditioning damper control - has gas sensors in outside air duct operating damper and fan controls Granted DE2743107A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19772743107 DE2743107A1 (en) 1977-09-24 1977-09-24 Quick-closing air conditioning damper control - has gas sensors in outside air duct operating damper and fan controls

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19772743107 DE2743107A1 (en) 1977-09-24 1977-09-24 Quick-closing air conditioning damper control - has gas sensors in outside air duct operating damper and fan controls

Publications (2)

Publication Number Publication Date
DE2743107A1 true DE2743107A1 (en) 1979-04-05
DE2743107C2 DE2743107C2 (en) 1987-08-20

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3910839A1 (en) * 1989-04-04 1990-10-11 Licentia Gmbh Device and control of a member for opening and closing a ventilation opening in a room
EP0509328A3 (en) * 1991-04-04 1993-02-24 Hitachi, Ltd. Method of detecting minute gas component in ambience and applied devices
US5462485A (en) * 1993-12-03 1995-10-31 Extraction Systems, Inc. Controlling air quality
US5856198A (en) * 1994-12-28 1999-01-05 Extraction Systems, Inc. Performance monitoring of gas-phase air filters
US6217441B1 (en) * 1999-03-30 2001-04-17 Honeywell International Inc. Method and apparatus for sealing building ductwork during chemical or biological attack
EP1216387A1 (en) * 1999-09-03 2002-06-26 Kenneth M. Berry Automatic response building defense system and method
WO2004015334A1 (en) * 2002-08-12 2004-02-19 Capital One Financial Corporation Methods and systems for controlling a mailroom environment
EP1752715A1 (en) * 2005-08-12 2007-02-14 Samsung Electronics Co., Ltd. Ventilation system and method for driving the same
WO2008048248A3 (en) * 2005-10-03 2008-09-12 Building Prot Systems Inc Building protection system and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1464372A1 (en) * 1962-12-01 1969-05-08 Raig Rational Ind Strahlenschu Arrangement and device for radiation protection bunker
DE6910684U (en) * 1969-03-14 1969-08-28 Gerhard Temke Vdi Vde Berat In AIR BUMPER CONTROL, MECHANICAL QUICK-CLOSING VALVE FOR AIR INTAKE LINES IN PROTECTIVE ROOMS
DE2319476A1 (en) * 1972-04-17 1973-10-31 Securitex Sarl PROTECTIVE DEVICE
DE2361729A1 (en) * 1973-12-12 1975-06-19 Klima & Kaelte Gmbh Ventilator duct fire-protection flap - with wire through slit in locking plate activated by fusion-soldered connection
DE2525567A1 (en) * 1975-06-07 1976-12-23 Richard A Wallace Safety device generates optical or acoustic warning signal - indicating presence of threshold concn. of toxic gases

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1464372A1 (en) * 1962-12-01 1969-05-08 Raig Rational Ind Strahlenschu Arrangement and device for radiation protection bunker
DE6910684U (en) * 1969-03-14 1969-08-28 Gerhard Temke Vdi Vde Berat In AIR BUMPER CONTROL, MECHANICAL QUICK-CLOSING VALVE FOR AIR INTAKE LINES IN PROTECTIVE ROOMS
DE2319476A1 (en) * 1972-04-17 1973-10-31 Securitex Sarl PROTECTIVE DEVICE
DE2361729A1 (en) * 1973-12-12 1975-06-19 Klima & Kaelte Gmbh Ventilator duct fire-protection flap - with wire through slit in locking plate activated by fusion-soldered connection
DE2525567A1 (en) * 1975-06-07 1976-12-23 Richard A Wallace Safety device generates optical or acoustic warning signal - indicating presence of threshold concn. of toxic gases

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3910839A1 (en) * 1989-04-04 1990-10-11 Licentia Gmbh Device and control of a member for opening and closing a ventilation opening in a room
EP0509328A3 (en) * 1991-04-04 1993-02-24 Hitachi, Ltd. Method of detecting minute gas component in ambience and applied devices
US5462485A (en) * 1993-12-03 1995-10-31 Extraction Systems, Inc. Controlling air quality
US5856198A (en) * 1994-12-28 1999-01-05 Extraction Systems, Inc. Performance monitoring of gas-phase air filters
US6217441B1 (en) * 1999-03-30 2001-04-17 Honeywell International Inc. Method and apparatus for sealing building ductwork during chemical or biological attack
EP1216387A4 (en) * 1999-09-03 2003-05-07 Kenneth M Berry Automatic response building defense system and method
EP1216387A1 (en) * 1999-09-03 2002-06-26 Kenneth M. Berry Automatic response building defense system and method
KR100816920B1 (en) * 1999-09-03 2008-03-26 케네스 엠 베리 Automatic response building defense system and method
WO2004015334A1 (en) * 2002-08-12 2004-02-19 Capital One Financial Corporation Methods and systems for controlling a mailroom environment
EP1752715A1 (en) * 2005-08-12 2007-02-14 Samsung Electronics Co., Ltd. Ventilation system and method for driving the same
WO2008048248A3 (en) * 2005-10-03 2008-09-12 Building Prot Systems Inc Building protection system and method
US7484668B1 (en) 2005-10-03 2009-02-03 Building Protection Systems, Inc. Building protection system and method
US7765072B2 (en) 2005-10-03 2010-07-27 Building Protection Systems, Inc. Building protection system and method

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