US3791279A - Damper unit for a ventilation system - Google Patents

Damper unit for a ventilation system Download PDF

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Publication number
US3791279A
US3791279A US00268955A US3791279DA US3791279A US 3791279 A US3791279 A US 3791279A US 00268955 A US00268955 A US 00268955A US 3791279D A US3791279D A US 3791279DA US 3791279 A US3791279 A US 3791279A
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US
United States
Prior art keywords
housing
damper
aperture
wall
partition wall
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.)
Expired - Lifetime
Application number
US00268955A
Other languages
English (en)
Inventor
J Holt
H Hansen
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.)
Novenco Building and Industry AS
Original Assignee
Nordisk Ventilator Co
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
Priority claimed from DK332371A external-priority patent/DK132673C/da
Priority claimed from DK437171A external-priority patent/DK144437C/da
Application filed by Nordisk Ventilator Co filed Critical Nordisk Ventilator Co
Application granted granted Critical
Publication of US3791279A publication Critical patent/US3791279A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/76—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by means responsive to temperature, e.g. bimetal springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
    • F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
    • F24F12/006—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an air-to-air heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/02—Roof ventilation
    • F24F7/025—Roof ventilation with forced air circulation by means of a built-in ventilator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F24F7/08—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output systems
    • 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means
    • F24F2013/1433—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means with electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means
    • F24F2013/1473—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means with cams or levers
    • 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
    • F24F2110/10—Temperature
    • 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]
    • Y02B30/56—Heat recovery units

Definitions

  • a damper unit for ventilating systems comprising a housing having two internal ducts or passages for fresh air and return air, respectively, and an internal by-pass between the ducts.
  • the ducts are parallel at the outer end of the housing and concentric at the inner end thereof.
  • One of the internal ducts is defined by an inclined, tubular partition wall which at its outer end merges with the housing wall and with a central partition between the parallel outer duct ends.
  • a pivotal damper has a first end position in which it obturates the by-pass which is provided in the central partition, and a second end position in which it obturates the outer ends of both ducts and opens the by-pass to provide full recirculation of spent room air. In intermediate positions the damper provides for partial recirculation.
  • the present invention relates to a damper unit for a ventilation system, comprising a housing that has a tubular outer wall and at one end thereof two concentric or essentially concentric apertures for connection to a central duct and to a surrounding annular duct in the ventilation system, respectively.
  • One of said ducts serves to convey fresh air to the ventilated room or rooms, while the other duct conveys return or spent air from the room.
  • the housing is provided with apertures for drawing in fresh air and for exhausting spent air, respectively, and between said ends the housing is provided with damper means for simultaneously varying the cross-sectional areas of the flow passages for fresh air and return air and of a by-pass or circulation passage connecting the fresh air and return air passages.
  • a unit of this type known from Danish patent specification No. 1 15,495, has two convex or arched damper plates which may pivot through an aperture in the wall ofa central duct in the unit that forms a continuation of the connected central ventilating duct.
  • the plates are pivotal between one end position in which they abut against the wall, and a second extreme posi tion in which they extend obliquely across and close both the central duct and a surrounding annular duct in continuation of the second ventilation duct while, at the same time, they open the aperture between the two ducts of the unit.
  • the supply of fresh air is at its maximum and the entire volume of return air from the ventilated room is exhausted, while in the second end position of the damper plates, a 100 recirculation of the room air is effected.
  • a partial recirculation takes place so that the spent room air is mixed with a certain volume of fresh air,'the magnitude of which depends upon the adjustment of the damper, while a corresponding volume of spent air is discharged.
  • the damper unit described has been found to be rather sensitive to depositions of dust on the damper plates since the pivot axis of each plate will of necessity be located rather much offset in relation to the mass or area centre of the plate, for which reason the plates are normally balanced with the aid of counterweights so as to limit the requisite adjusting force.
  • the surface area of the counterweight is considerably smaller than that of the damper plates, deposited dust, even if the deposition takes place uniformly on the surface, produces an unbalance that may render the adjustment of the plates difficult and give rise to overload of the motor serving to effect the adjustment.
  • the damper plates due to their fairly complicated shape, are correspondingly difficult and expensive to fabricate.
  • a damper unit of the kind referred to above which is characterwhich coinsides with the outer wall while the reminder of said contour is a straight line so that the two ducts surrounding each other through the inner or first part of the housing merge smoothly into two parallel ducts in the outer or last part of the housing, which parallel ducts are separated by a flat partition, said partition having beyond the connection to the tubular patition an aperture of the same shape and size as the total area of a section through the two parallel ducts, the damper having a corresponding shape and size.
  • the partition extends in a median plane through the outermost end of the housing, which offers the additional advantage that the cross-sectional areas of the passages for fresh air and return air becomeequal in case of the normal symmetrical cross-sectional shape of the housing.
  • the outermost extremity of the tubular partition or pipe section may be connected directly to the internal surface of the housing and to the innermost terminal edge of the flat partition respectively, whereby it is achieved that, at the point where the pipe section meets the housing or the flat partition, there are no surface on which substantial depositions of dust are able to form.
  • the section through the two parallel ducts referred to in the foregoing may be a section at right angles to the axial direction of the ducts and, if the ducts are cylindrical, the aperture will in this case be circular and the damper will be shaped accordingly. It is advantageous, however, that the section is oblique and forms an angle to the axialdirection of the ducts which is smaller than 45, by way of preference less than 30.
  • the housing may be divided into two sections in a transversal plane extending essentially through the pivot axis of the damper, which two sections are hingedly connected with each other. A particularly easy access for cleaning and possibly for the removal of the damper is obtained hereby.
  • FIG. 1 shows an axial section through the unit in one extreme position of the damper
  • FIG. 2 shows a corresponding section in the other extreme position of the damper
  • FIG. 3 shows a corresponding section with the damper in an intermediate position
  • FIG. 4 is a section corresponding to the one shown in FIG. 1, in which additional features are illustrated which are designed to reduce dust and ice deposits inside the unit, and
  • FIG. 5 shows a section corresponding to FIG. 1 of a modified embodiment.
  • the damper unit shown in the drawings has an elongated tubular housing 1 which may have any crosssectional shape, preferably though circular or regularly polygonal, particularly quadratic. Housing 1 may, for instance, be mounted in the roof ridge of a stable which is to be ventilated by means ofa fan (not shown) which is fitted with two sets of mechanically coupled axial vanes having opposed directions of pitch and located in a central ventilation duct and in a surrounding annular duct, respectively.
  • a blower of this design is shown in the aforesaid Danish patent specification No. I l5,495.
  • cover 2 which comprises a tubular portion 3 that forms a continuation of housing I and is connected thereto by means of a hinge 4, and a cover plate 5.
  • Cover plate 5 has an aperture 6 which, in the embodiment shown, extends across half of the cross-sectional area of cover portion 3 and which, towards the centre, is defined by a partition 7 located in the common axial median plane of cover 2 and housing 1.
  • partition 7 located in the common axial median plane of cover 2 and housing 1.
  • partition 8 located in the same plane and the two partitions 7 and 8 have opposing cut-out sections which together define an aperture or by-pass 9 in which a damper I0 is fitted pivotably about a horizontal axis located in said median plane.
  • Aperture 9 has the same size and shape as aperture l2 and thus it will be closed by damper 10 when the damper assumes the vertical position shown in FIG.
  • a pipe section 13 extends obliquely downwards through housing 1 from the bottom edge of partition 8 and the topmost extremity of the pipe section fits tightly to this edge as well as to the inside of that portion of housing 1 which lies vertically below aperture 6.
  • Pipe section 13 is arranged obliquely in such a way that the aperture 14 in the lower end of the section is concentric with the lowermost end of housing 1 and preferably equiform with it.
  • an annular aperture 15 is defined between the lower endof pipe section 13 and housing 1, and the two apertures 14 and 15 are designed to be connected to the above-mentioned coaxial ducts of the ventilation system (not shown).
  • the areas of the two apertures 14 and 15 are of equal sizes.
  • housing 1 has a circular cross-section
  • the lowermost aperture 14 of pipe section 13 is also circular in cross-section while its topmost aperture 16, just like aperture 6, is semi-circular in cross-section.
  • a pipe section having two thus shaped terminal apertures is developable and can consequently be fabricated from sheet material without difficulty.
  • pipe 1 and, hence, apertures 14 and 15 might alternatively have a polygonal cross-section and, if this is the case, pipe section 13 can be produced either by folding a plate or by joining flat plate portions together.
  • a servomotor 18 which, via a linkage 19, is connected to damper l0 and, as indicated in the drawings, motor 18 may be constructed with a sensor portion 20 that projects down into pipe section 13, whereby the position of damper 10 is adjusted in dependence upon the temperature of the return air flowing through the pipe section.
  • motor 17 it is also possible to control motor 17 by a thermostat fitted in the ventilated room itself.
  • the fresh air is drawn in underneath the downwardly-curved cover plate 5 and through an aperture 21 in that half of the cover portion 3 which, in FIG. 1, is located to the right-hand side of partition 7.
  • duct 17 and its continuation through pipe section 13 is completely cut off from duct 22 of the unit that connects aperture 21 with the annular aperture 15 in the bottom of housing 1.
  • damper 10 As already indicated in FIGS. l-3, it may be expedient to construct damper 10 with a lenticular crosssection so that, in its hollow interior, there will be room for a through supporting shaft that is pivotably journalled in bearings secured to either housing 1 or cover 2.
  • the internal hollow space of the damper can be filled with insulating material or, as shown in FIG. 4, heating elements 23, e.g. electrical heating elements, may be incorporated whose power supply lines can be carried out through or parallel to the damper shaft. It is also possible, as shown in FIG. 4 to mount similar heating elements 24 around the vertical ducts in cover 2 and possibly, around housing 1 as well.
  • FIG. 4 also shows insulating material 25 disposed outside the housing and cover.
  • damper 10 in the extreme position shown, is not arranged at right angles to the direction of the duct but in an oblique position so that, in said extreme position, it forms an angle to the direction of the axis which, in the embodiment shown, is approximately 45, but which may, with advantage, be less than that.
  • a cover plate 26 is indicated with dotted lines which covers the upper half of aperture 9 in partition 7, 8.
  • This cover plate is sufficiently staggered in relation to the partition so as not to obstruct the movement of damper 10, but it may also constitute a portion of partition 7, 8 so that only the bottom half of aperture 9 is formed in the partition. If this is the case, damper 10 will have to be journalled or shaped, e.g. cranked, in such a way that its pivoting movement is not impeded.
  • damper and/or the housing in their entirety of insulating material, for in stance, plastics material having an interior cell structure with or without incorporated heating elements.
  • a damper unit for a ventilation system comprising:
  • a tubular housing defined by an outer wall and having a first and a second end
  • a tubular member extending internally of said housing from said first end towards said second end thereof at an angle with respect to the longitudinal axis of the housing, the end of said tubular member located at said first housing end defining a central aperture substantially coaxial with the outer wall of the housing whereby an annular aperture is formed between said tubular member and said outer wall, the opposite end of said tubular member having a contour comprising a first part which coincides with the inner contour of said outer wall, and a second part which is a straight line contiguous with the inner end of said flat partition wall, whereby first and second through passages are formed within said housing, the first passage connecting said central aperture with the interspace between one side of said partition wall and said outer wall, and the second passage connecting said annular aperture with the interspace between the opposite side of said partition wall and saidouter wall.
  • said flat partition wall having an aperture therein with a contour of the same shape and size as a plane section through said tubular housing
  • a damper pivotally supported within said housing on a transverse axis parallel to said flat partition wall and having a contour of the same size and shape as the aperture in said partition wall, whereby said damper may be selectively pivoted between a first end position in which it closes said aperture, and a second end position in which it closes the through passages between said first and second ends of said housing and permits a circulation of air between said central aperture and said surrounding annular aperture located at said first end of said housing.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Air-Flow Control Members (AREA)
US00268955A 1971-07-06 1972-07-05 Damper unit for a ventilation system Expired - Lifetime US3791279A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK332371A DK132673C (da) 1971-07-06 1971-07-06 Spjeldaggregat til et ventilationsanleg
DK437171A DK144437C (da) 1971-09-06 1971-09-06 Spjaeldaggregat til ventilationsanlaeg

Publications (1)

Publication Number Publication Date
US3791279A true US3791279A (en) 1974-02-12

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ID=26066991

Family Applications (1)

Application Number Title Priority Date Filing Date
US00268955A Expired - Lifetime US3791279A (en) 1971-07-06 1972-07-05 Damper unit for a ventilation system

Country Status (10)

Country Link
US (1) US3791279A (xx)
CA (1) CA956499A (xx)
CH (1) CH555035A (xx)
CS (1) CS160062B2 (xx)
DD (1) DD97719A5 (xx)
DE (1) DE2232482C2 (xx)
FR (1) FR2144801B1 (xx)
IT (1) IT964477B (xx)
NL (1) NL175849C (xx)
SE (1) SE373931B (xx)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5000081A (en) * 1990-04-23 1991-03-19 Gilmer Robert S Ventilation apparatus
WO2005072171A2 (en) * 2004-01-28 2005-08-11 Hh Technologies, Inc. Vertical door fan shutter
FR2933478A1 (fr) * 2008-07-02 2010-01-08 Soler Et Palau Registre pour la gestion d'un puits canadien, systeme de ventilation employant un puits canadien avec un tel registre
US20120108159A1 (en) * 2010-10-27 2012-05-03 Arzel Zoning Technology, Inc. Foldable, boot loadable, insertable air damper device
US20120289144A1 (en) * 2011-05-13 2012-11-15 Brown Kent L Venting and cooling system for a house
WO2014036610A1 (en) * 2012-09-07 2014-03-13 Csr Building Products Limited Airflow valve
GB2510555A (en) * 2012-11-28 2014-08-13 Building Product Design Ltd Passive ventilation device with heat recovery mode
US20160169543A1 (en) * 2014-12-10 2016-06-16 Roger Allestad System for ventilating a structure
US9551499B1 (en) * 2006-10-20 2017-01-24 Omni Containment Systems, Llc Hinge assembly for supporting a fan on a roof
US11460202B2 (en) 2019-04-30 2022-10-04 Gary Gerard Powers Roof mounted ventilation assembly

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29611515U1 (de) * 1996-07-02 1996-09-05 Siegenia-Frank Kg, 57074 Siegen Umluft-Betriebsvorrichtung für ein Zwangslüftungsgerät
DE19959237C1 (de) * 1999-12-08 2001-07-05 Wiesheu Gmbh Vorrichtung zum Kondensieren von Dampf
EP2052191B1 (de) * 2006-08-18 2016-11-16 Belimo Holding AG Luftklappe zur durchflussregelung innerhalb einer rohrleitung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2467018A (en) * 1945-05-11 1949-04-12 Lewis W Eggleston Ventilating unit
US3363531A (en) * 1966-10-14 1968-01-16 Lohmann Appbau K G Ventilating arrangement for the rooms of a building, especially of a stall, pigsty, fwl-house or the like
US3487767A (en) * 1967-01-30 1970-01-06 Nordisk Ventilator Fan for the ventilation of buildings,e.g.,stables
US3557681A (en) * 1968-01-25 1971-01-26 Nordisk Ventilator Fan for the ventilation of buildings, e.g. stables

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1959678U (de) * 1966-10-29 1967-05-03 Schulte & Dieckhoff Gmbh Verkaufsbehaelter.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2467018A (en) * 1945-05-11 1949-04-12 Lewis W Eggleston Ventilating unit
US3363531A (en) * 1966-10-14 1968-01-16 Lohmann Appbau K G Ventilating arrangement for the rooms of a building, especially of a stall, pigsty, fwl-house or the like
US3487767A (en) * 1967-01-30 1970-01-06 Nordisk Ventilator Fan for the ventilation of buildings,e.g.,stables
US3557681A (en) * 1968-01-25 1971-01-26 Nordisk Ventilator Fan for the ventilation of buildings, e.g. stables

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5000081A (en) * 1990-04-23 1991-03-19 Gilmer Robert S Ventilation apparatus
WO2005072171A2 (en) * 2004-01-28 2005-08-11 Hh Technologies, Inc. Vertical door fan shutter
WO2005072171A3 (en) * 2004-01-28 2005-11-10 Hh Technologies Inc Vertical door fan shutter
US20080233861A1 (en) * 2004-01-28 2008-09-25 Lesley Ray Jenkins Vertical Door Fan Shutter
US9551499B1 (en) * 2006-10-20 2017-01-24 Omni Containment Systems, Llc Hinge assembly for supporting a fan on a roof
FR2933478A1 (fr) * 2008-07-02 2010-01-08 Soler Et Palau Registre pour la gestion d'un puits canadien, systeme de ventilation employant un puits canadien avec un tel registre
US8951103B2 (en) * 2010-10-27 2015-02-10 Arzel Zoning Technology, Inc. Foldable, boot loadable, insertable air damper device
US20150159908A1 (en) * 2010-10-27 2015-06-11 Arzel Zoning Technology, Inc. Foldable, boot loadable, insertable air damper device
US12007141B2 (en) 2010-10-27 2024-06-11 Arzel Zoning Technology, Inc. Foldable, boot loadable, insertable air damper device
US20120108159A1 (en) * 2010-10-27 2012-05-03 Arzel Zoning Technology, Inc. Foldable, boot loadable, insertable air damper device
US20120289144A1 (en) * 2011-05-13 2012-11-15 Brown Kent L Venting and cooling system for a house
US9285131B2 (en) * 2011-05-13 2016-03-15 Kent L. Brown Venting and cooling system for a house
WO2014036610A1 (en) * 2012-09-07 2014-03-13 Csr Building Products Limited Airflow valve
AU2013313028B2 (en) * 2012-09-07 2017-04-13 Csr Building Products Limited Airflow valve
GB2510555A (en) * 2012-11-28 2014-08-13 Building Product Design Ltd Passive ventilation device with heat recovery mode
GB2510555B (en) * 2012-11-28 2018-10-24 Building Product Design Ltd Ventilation device with heat recovery mode
US20160169543A1 (en) * 2014-12-10 2016-06-16 Roger Allestad System for ventilating a structure
US11460202B2 (en) 2019-04-30 2022-10-04 Gary Gerard Powers Roof mounted ventilation assembly

Also Published As

Publication number Publication date
DD97719A5 (xx) 1973-05-12
CS160062B2 (xx) 1975-02-28
CH555035A (de) 1974-10-15
CA956499A (en) 1974-10-22
IT964477B (it) 1974-01-21
NL175849B (nl) 1984-08-01
FR2144801B1 (xx) 1976-01-16
NL7209388A (xx) 1973-01-09
NL175849C (nl) 1985-01-02
SE373931B (xx) 1975-02-17
DE2232482C2 (de) 1982-06-03
DE2232482A1 (de) 1973-01-18
FR2144801A1 (xx) 1973-02-16

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