US2988626A - Baseboard heater and the like - Google Patents

Baseboard heater and the like Download PDF

Info

Publication number
US2988626A
US2988626A US778480A US77848058A US2988626A US 2988626 A US2988626 A US 2988626A US 778480 A US778480 A US 778480A US 77848058 A US77848058 A US 77848058A US 2988626 A US2988626 A US 2988626A
Authority
US
United States
Prior art keywords
heater
air
assembly
blower
over
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
US778480A
Inventor
Carl M Buttner
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.)
Robbins and Myers Inc
Original Assignee
Robbins and Myers Inc
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 Robbins and Myers Inc filed Critical Robbins and Myers Inc
Priority to US778480A priority Critical patent/US2988626A/en
Application granted granted Critical
Publication of US2988626A publication Critical patent/US2988626A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT GENERATING MEANS, IN GENERAL
    • F24H3/00Air heaters having heat generating means
    • F24H3/02Air heaters having heat generating means with forced circulation
    • F24H3/04Air heaters having heat generating means with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405Air heaters having heat generating means with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • F24H3/0411Air heaters having heat generating means with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between for domestic or space-heating systems

Description

June 13, 1961 c. M. BUTTNER BAsEBoAED HEATER AND THE LIKE 2 Sheets-Sheet 1 Filed Dec. 5, 1958 INVENTOR. 214% /Warr/VER,
ATTCRNEYS.
lived?.
June 13, 1961 C. M. BUTTNER 2,988,626
BASEBOARD HEATER AND THE LIKE Filed Dec. 5, 1958 2 Sheets-Sheet 2 INVENTOR. (kfz /fc/rrA/ER,
ATTORNEYS.
Y 2,988,626, .Y BASEBOARD HEATER AND THE LIKE CarlM. Bnttner, Memphis, Tenn.,- assignor to Robbins & Myers, Inc., Springfield, Ohio, a corporation of Ohio i Filed Dec. 5, 1958, Ser. No. 778,480
'z Claims. ((1219-39) lThis invention relates to an-electric heater for installation at or above oor level and is particularly advantageous in use as a baseboard heater, i.e. a heater which is mounted on the surface of -the wall at the baseboard or recessed into the Wall.
In providing a heater for installation at or above the floor level or along the baseboards, space considerations become of great importance. If the heater is to be recessed into the wall it should be of such depth that it can be substantially wholly recessed. If it is to be mounted on the surface of the wall it must be of minimum depth so as not to project into the room. It is desirable also that the heater be of relatively short length so as not to obstruct wall space which could be used for furniture.
With the foregoing considerations in mind, it is an object of my invention to provide a heater which may be made of such dimensions that it can be recessed in a wall so as not to project into the room or which when mounted on the surface of the wall projects into the room a minimum distance. It is another object of the invention to provide a heater as outlined above which will be efficient in operation and which can be of relatively high B.t.u. rating without an increase in its overall dimensions and which will be safe in its installation in a Wall.
Further objects include the provision of a heater as described above which will be thermostatically actuated to maintain an even temperature and avoid over-running and which will be provided with safety features which make it desirable for domestic installation.
These and other objects of the invention which will be described in more detail hereinafter or which will be apparent to one skilled in the art upon reading these specifications I accomplish by thatcertain construction and arrangement of parts of which I shall now describe an exemplary embodiment.
Reference is made to the drawings forming a part hereof and in which:
FIGURE I is a front elevational view with parts broken away of a heater according to the present invention.
FIGURE v2. is a horizontal cross-sectional view of the :same taken on the line 2 2 of FIGURE l.
FIGURE 3 iS a vertical cross-sectional view on an enlarged scale taken on the line 3 3 of FIGURE l.
FIGURE 4 is ,a vertical cross-sectional View on an enlarged scale taken on the line 4 4 of FIGURE l.
` FIGURE 5 is a perspective View of the complete heater .on a greatly reduced scale.
' Briefly, in the practice of my invention I provide an installation box preferably of sheet metal, which is adapted .to be recessed into a wall and I provide a cover for the installation box, which cover is provided with necessary louvers and actuating members for the control devices. Within the installation box I mount the heater assembly proper which is provided with means to insulate it from .the installation box insofar as heat and vibration are concerned. At one end of the heater assembly proper `there is provided a blower compartment within which there is mounted a motor blower unit which is vibration insulated from the assembly. At its lower portion the blower compartment communicates with an air chamber 'extending along the bottom of the assembly over submice stantially the entire remaining length thereof. Above the air chamber is a heat exchange space in which electric heating elements are mounted so that the air moved by the blower into the air chamber passes upwardly over the heating elements and after being heated thereby is discharged forwardly into the room through suitable louvers in the installation box cover.
Referring now in more detail to the drawings, the installation box is indicated at 10 and may be made from sheet metal in any desired manner. The box 10 may be provided with the flanges 11 at the top `and 12 at the bottom and 13 at the ends. The cover plate is indicated generally at 14 and it is preferably anged at the top as at 15 and the bottom as at 16 and the ends yas at 17. As will be clear from FIGURE 2, in assembly the flanges 17 engage the anges 13 and as can be seen from FIGURES 3 and 4 the ange 16 abuts the flange 12 while the flange 15 at the top hooks into the hookshaped flange I1. The cover plate 14 may be held in place by means of screws las indicated at 18.
The cover plate is provided with a set of louvers at 19 to permit entry of air into the blower compartment and the louvers 2G for egress of heated air from the heat exchange space. Preferably an opening 21 is provided adjacent the louvers 19 and within the opening 21 a thermostat element 22 is mounted so that air drawn into the blower chamber passes over the element 22 which senses the temperature of the incoming air. The setting of the thermostat may be adjusted by means of a knob 23 mounted on the cover plate 14.
The heater assembly proper which is mounted in the installation box It) comprises a casing 24. The casing 24 is mounted on the flanges 13 as best seen in FIGURE 2 by means of screws or bolts 25 provided with rubber grommets 26 for vibration insulation. The assembly 24 rests on the bottom ofthe installation box on rubber feet 27. From inspection of FIGURES 2, 3 and 4, it will be clear that an air space is provided on all sides of and behind the heater assembly proper and with the installation box 10. This air space limits heat transfer from the heater assembly proper to the installation box to a bare minimum. With this arrangement, the B.t.u. rating of the heater can be increased considerably without increasing over-all dimensions. In some cases it may be found desirable to provide air bleeder holes as indicated in dotted lines in FIGURE 3 at 28.
At the left-hand end of the assembly, as seen in FIG- URES l, 2 and 5, there is provided a blower compartment. Within this compartment a motor 29 is mounted and disposed to drive a blower 30. The motor 29 is mounted by means of brackets 31 and is vibration insulated from the assembly by the rubber grommets 32. It will be observed that for economy in space, the motor is partly displaced inside the blower wheel 39. The blower is of the centrifugal type and the left-hand end of the heater assembly is formed `arcuately to provide the scroll or volute chamber 33. The blower rotates in a counterclockwise direction in FIGURE 1 so that the air sucked in through the louvers 19 is caused to move toward the right at the bottom of FIGURE l into the air chamber 34.
The air owing toward the right at the bottom ofthe assembly into the air chamber 34 must now be directed upwardly over the .heater coils and also it must be distributed uniformly over the length of the coils. To this end, I have provided a plurality of baffles of graduated length. At the left of FIGURE 1 nearest the blower compartment there is a vertical baffle 35. Next there is a bathe 36 and other bafles 37, 38 and 39. It will be noted that the bae 3'5 deflects 4upwardly a small increment of the air stream as indicated by the arrows, while the -batile 36 picks up an additional increment. Additionally, the baes 37, 38, 39 pick up and deflect addi- Patented June 13, 1961` j tional increments of the air stream upwardly. The balance of the air stream is deflected upwardly by the bulkhead or the end of the heater assembly proper. In this way, the air stream which is of relatively small cross section as it comes' from the blower compartment is distributed over the entire length of the heating elements as it is dellected upwardly. The front of the air chamber is closed by the plate 40.
Above the air chamber are mounted a plurality of ceramic supports for the heating elements as indicated at 41. 'Ihese are best seen in elevation in FIGURE 3. Floating support rods 42 allow for noiseless expansion and contraction of the ceramic heating element supports 41 and their associated elements by means of compression springs `58 assembled at each end over the support rods 4,2. The springs `58 also serve as shock absorbers to prevent damage of the heating element assembly during shipping. The heating element supports 41, as best seen in FIGURE 3, are provided with the holes 43 which are arranged in pairs so that the heating elements may be threaded alternately through these holes in a zig zag coniiguration as seen at 44 in FIGURE l. This prevents the heating elements 44 from vibrating or singing.
As best seen in FIGURE 3, a number of baffles disposed vertically and parallel to the heating elements are provided as at 45, 46 and 47. The upper ends of these baffles are curved forwardly as at 48, 49 and 5t). These bailes insure that the heated air, after passing over the heating elements 44, is uniformly distributed to be ejected through the louvers 20.
An over-heat limit switch is indicated somewhat diagrammatically at 51 and a control thermostat is indicated at 52. The thermostat 52 is actuated by the knob 23. An automatic disconnect switch is shown at 54 so that when the cover plate 14 is removed from the installation box, the switch 54 automatically opens, disconnecting the entire unit from the line. When the cover plate 14 is reinstalled, the spring 55 recloses the switch 54. It will be understood that the heating elements are connected in series with the over-heat limit switch v51, the control thermostat 52 and the disconnecting switch 54. The line terminals are indicated at 56 and the heating element terminals are indicated at 57.
By means of the knob 23, the thermostat '52 may be set for a desired temperature, preferably between 50 F. and 90 F. As the blower 30 operates, air is drawn through the opening 21 over the thermostat bulb 22 so that quick response is insured and over-run of the unit is limited.
The over-heat limit switch 51 is of any well known heat operated type which opens in the event of over-heat which might result from failure of the blower motor 29 or restrictions accidentally placed in front of the heater louvers 19 or 20. The switch 51 is preferably the type which will automatically reconnect when the temperature has been reduced by correction of the fault which caused it to operate.
It will be understood that details of construction of this heater may be varied without departing from the spirit of the invention. While I do not intend to be limited to dimensions, I may point out that a satisfactory baseboard heater according to the present invention has been produced which has a length of about thirty-three inches, a height of about thirteen inches and a depth of about four inches. With these dimensions, I have been able to produce a heater having a B.t.u. rating of 8,500 at a low noise level and low and safe temperatures.
Having now fully described my invention, what I claim as new and desire to secure by Letters Patent is:
1. An electric heater adapted to be installed at the base of a wall of -a room,V comprising a horizontally elongated installation box, said installation box being relatively thin and narrow for convenient and unobtrusive mounting; Ya heater assembly supported in saidbox with vibration insulation means between said assembly and box and with an air space therebetween for heat insulation; said assembly comprising a volute blower compartment at one end, and a centrifugal blower and driving motor therefor mounted in said compartment with vibration insulation means, said motor being partly recessed within said blower; an opening at the bottom of said volute compartment in said heater assembly communicating with an air chamber extending over substantially the remaining length of the lower part of said assembly, said air chamber being open at the top; a series of vertical bales mounted in said horizontal air chamber, said baffles being of graduated vertical extent down into said air chamber with the shortest baffle being at that end of said chamber nearest said blower compartment and the longest being at the remote end therefrom, said battles serving to direct the horizontally moving air stream from said blower compartment upwardly through the open top of said air chamber in substantially equal increments over the entire length of said chamber; electric heating elements mounted in said assembly above said air chamber and extending substantiallyl the entire length thereof; vertical baffles associated with said heating elements parallel to the length thereof and of graduated height, the shortest being at the front of said assembly and the longest at the rear, said last named baflles being bent forwardly at their upper ends to direct the vertically moving air stream forwardly in increments over substantially the entire remaining height of said assembly; and a cover plate for said box, said cover plate having inlet louvers for said blower compartment and outlet louvers for the air deflected forwardly by said last mentioned battles.
2. The structure of claim l, wherein said electric heating elements are supported by transversely disposed ceramic heating element supports, said heating elements passing through oiset holes in said supports in zig zag configuration.
References Cited in the le of this patent UNITED STATES PATENTS 978,704 Daningburg Dec. 13, 1910 1,526,843 Dominguez Feb. 17, 1925 1,752,830 Bliss Apr. 1, 1930 1,832,444 Berger Nov. 17, 1931 1,870,460 Lambert Aug. 9, 1932 1,979,222 Goodwin Oct. 3,0, 1934 2,153,576 Kurth et al. Apr. 1l, 1939 2,349,215 Wahlborg May 16, 1944 2,458,268 Hinds Jan. 4, 1949 2,470,646 Richardson May 17, 1949 2,503,764 Ott Apr. 11, 1950 2,513,945 Kitto et al. c July 4, 1950 2,528,650 Graham Nov. 7, 1950 2,578,819 Mast et al. Dec. 18, 1951 2,662,963 Wessel Dec. 15, 1953 2,808,237 Fosnes Oct. l, 1957 2,823,291 Fiandt Feb. 11, 1958 FOREIGN PATENTS 571,735 Great Britain Sept. 6, 1945
US778480A 1958-12-05 1958-12-05 Baseboard heater and the like Expired - Lifetime US2988626A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US778480A US2988626A (en) 1958-12-05 1958-12-05 Baseboard heater and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US778480A US2988626A (en) 1958-12-05 1958-12-05 Baseboard heater and the like

Publications (1)

Publication Number Publication Date
US2988626A true US2988626A (en) 1961-06-13

Family

ID=25113478

Family Applications (1)

Application Number Title Priority Date Filing Date
US778480A Expired - Lifetime US2988626A (en) 1958-12-05 1958-12-05 Baseboard heater and the like

Country Status (1)

Country Link
US (1) US2988626A (en)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3157776A (en) * 1961-10-23 1964-11-17 Arvin Ind Inc Wall mounted heater
US3267255A (en) * 1964-01-30 1966-08-16 Gen Electric Forced air electric baseboard heater
US3303325A (en) * 1964-02-17 1967-02-07 Gen Electric Electric hair dryer having combined motor switch and thermostatic heater switch control means
US3305665A (en) * 1959-11-17 1967-02-21 Laing Vortex Inc Forced circulation electric heater employing cross-flow type fan
US3341675A (en) * 1965-08-26 1967-09-12 Sola Basic Ind Inc Space heater with two thermal sensors acting on a controller actuator along approximately the same line
US3348021A (en) * 1965-02-15 1967-10-17 Gen Electric Electric heater assembly for a sauna room
US3473006A (en) * 1966-09-02 1969-10-14 Intertherm Forced air circulation hot water heater unit
US3575583A (en) * 1968-09-05 1971-04-20 Oakland Metal Fabricators Inc Hot air blower
US3590218A (en) * 1970-01-02 1971-06-29 Emerson Electric Co Wall mounted heater
US3769494A (en) * 1971-02-08 1973-10-30 S Janson Overheating protection arrangement in an electric sauna unit
US4035610A (en) * 1975-12-08 1977-07-12 Intertherm, Inc. Furnace cabinet having integral heater and blower assemblies
US4163144A (en) * 1975-04-25 1979-07-31 Elmetherm Heated doors
US4511786A (en) * 1982-04-09 1985-04-16 P.J. Industrial Safety Elec. Co. Ltd. Forced air distributor for baseboard heater
US4523081A (en) * 1982-12-27 1985-06-11 M. P. Metal Products, Inc. Forced air baseboard heater and air duct diffuser
US5568586A (en) * 1995-06-19 1996-10-22 Junkel; Eric F. Over-heat protection for a portable space heater with thermally insulated thermostat mounted above slot cut in reflector
FR2784172A1 (en) * 1998-10-02 2000-04-07 Bernard Peyronny Heating door
US20050078952A1 (en) * 2003-10-09 2005-04-14 Bain Benjamin H. Electric heater with forced air module
EP2078444A2 (en) * 2006-11-01 2009-07-15 SEARLE, Bruce R. Infrared room heater system
US20140034631A1 (en) * 2012-08-06 2014-02-06 General Electric Company Heater assembly for an appliance
US10995971B2 (en) * 2018-11-29 2021-05-04 Ningbo Baogong Electrical Appliance Co., Ltd. Energy-saving and environment-friendly double-row air duct heater

Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US978704A (en) * 1910-07-05 1910-12-13 William J Daningburg Attachment for printing-presses.
US1526843A (en) * 1923-11-22 1925-02-17 Charles A Denis Electric heating element
US1752830A (en) * 1929-04-15 1930-04-01 Jr Edward P Bliss Motor-driven blower
US1832444A (en) * 1928-07-24 1931-11-17 Western Electric Co Safety device
US1870460A (en) * 1931-10-15 1932-08-09 Heintz Mfg Co Air cooling cabinet and method for preventing condensation of moisture thereon
US1979222A (en) * 1933-09-13 1934-10-30 Allie J Goodwin Cabinet
US2153576A (en) * 1936-10-27 1939-04-11 Anemostat Corp America Air supply device
US2349215A (en) * 1938-07-13 1944-05-16 Electrolux Corp Vacuum cleaner
GB571735A (en) * 1943-07-13 1945-09-06 Archibald Irving Improved means for heating or cooling and ventilating buildings
US2458268A (en) * 1946-02-05 1949-01-04 Northeast Electric & Engineeri Forced circulation electrically heated space heater
US2470646A (en) * 1948-03-24 1949-05-17 Charles L Richardson Clothes drier
US2503764A (en) * 1945-02-17 1950-04-11 Trade Wind Motorfans Inc Fan accelerated radiator cabinet
US2513945A (en) * 1946-12-14 1950-07-04 G M Lab Inc Heater fan combination
US2528650A (en) * 1949-08-18 1950-11-07 Frank A Graham Wall type electric air heater and circulator
US2578819A (en) * 1949-07-13 1951-12-18 Electromode Corp Controlled electric heater
US2662963A (en) * 1950-08-07 1953-12-15 Cavalier Corp Electric air heater
US2808237A (en) * 1953-02-16 1957-10-01 Kenneth E Fosnes Wall mounted air circulating heat exchangers
US2823291A (en) * 1954-07-21 1958-02-11 Preway Inc Space heater of the convection circulation type

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US978704A (en) * 1910-07-05 1910-12-13 William J Daningburg Attachment for printing-presses.
US1526843A (en) * 1923-11-22 1925-02-17 Charles A Denis Electric heating element
US1832444A (en) * 1928-07-24 1931-11-17 Western Electric Co Safety device
US1752830A (en) * 1929-04-15 1930-04-01 Jr Edward P Bliss Motor-driven blower
US1870460A (en) * 1931-10-15 1932-08-09 Heintz Mfg Co Air cooling cabinet and method for preventing condensation of moisture thereon
US1979222A (en) * 1933-09-13 1934-10-30 Allie J Goodwin Cabinet
US2153576A (en) * 1936-10-27 1939-04-11 Anemostat Corp America Air supply device
US2349215A (en) * 1938-07-13 1944-05-16 Electrolux Corp Vacuum cleaner
GB571735A (en) * 1943-07-13 1945-09-06 Archibald Irving Improved means for heating or cooling and ventilating buildings
US2503764A (en) * 1945-02-17 1950-04-11 Trade Wind Motorfans Inc Fan accelerated radiator cabinet
US2458268A (en) * 1946-02-05 1949-01-04 Northeast Electric & Engineeri Forced circulation electrically heated space heater
US2513945A (en) * 1946-12-14 1950-07-04 G M Lab Inc Heater fan combination
US2470646A (en) * 1948-03-24 1949-05-17 Charles L Richardson Clothes drier
US2578819A (en) * 1949-07-13 1951-12-18 Electromode Corp Controlled electric heater
US2528650A (en) * 1949-08-18 1950-11-07 Frank A Graham Wall type electric air heater and circulator
US2662963A (en) * 1950-08-07 1953-12-15 Cavalier Corp Electric air heater
US2808237A (en) * 1953-02-16 1957-10-01 Kenneth E Fosnes Wall mounted air circulating heat exchangers
US2823291A (en) * 1954-07-21 1958-02-11 Preway Inc Space heater of the convection circulation type

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3305665A (en) * 1959-11-17 1967-02-21 Laing Vortex Inc Forced circulation electric heater employing cross-flow type fan
US3157776A (en) * 1961-10-23 1964-11-17 Arvin Ind Inc Wall mounted heater
US3267255A (en) * 1964-01-30 1966-08-16 Gen Electric Forced air electric baseboard heater
US3303325A (en) * 1964-02-17 1967-02-07 Gen Electric Electric hair dryer having combined motor switch and thermostatic heater switch control means
US3348021A (en) * 1965-02-15 1967-10-17 Gen Electric Electric heater assembly for a sauna room
US3341675A (en) * 1965-08-26 1967-09-12 Sola Basic Ind Inc Space heater with two thermal sensors acting on a controller actuator along approximately the same line
US3473006A (en) * 1966-09-02 1969-10-14 Intertherm Forced air circulation hot water heater unit
US3575583A (en) * 1968-09-05 1971-04-20 Oakland Metal Fabricators Inc Hot air blower
US3590218A (en) * 1970-01-02 1971-06-29 Emerson Electric Co Wall mounted heater
US3769494A (en) * 1971-02-08 1973-10-30 S Janson Overheating protection arrangement in an electric sauna unit
US4163144A (en) * 1975-04-25 1979-07-31 Elmetherm Heated doors
US4035610A (en) * 1975-12-08 1977-07-12 Intertherm, Inc. Furnace cabinet having integral heater and blower assemblies
US4511786A (en) * 1982-04-09 1985-04-16 P.J. Industrial Safety Elec. Co. Ltd. Forced air distributor for baseboard heater
US4523081A (en) * 1982-12-27 1985-06-11 M. P. Metal Products, Inc. Forced air baseboard heater and air duct diffuser
US5568586A (en) * 1995-06-19 1996-10-22 Junkel; Eric F. Over-heat protection for a portable space heater with thermally insulated thermostat mounted above slot cut in reflector
FR2784172A1 (en) * 1998-10-02 2000-04-07 Bernard Peyronny Heating door
WO2000020802A1 (en) * 1998-10-02 2000-04-13 Bernard Peyronny Heating door
US6470143B1 (en) 1998-10-02 2002-10-22 Bernard Peyronny Heating door with spring-mounted heaters
US20050078952A1 (en) * 2003-10-09 2005-04-14 Bain Benjamin H. Electric heater with forced air module
EP2078444A2 (en) * 2006-11-01 2009-07-15 SEARLE, Bruce R. Infrared room heater system
EP2078444A4 (en) * 2006-11-01 2013-02-20 Acepower Logistics Inc Infrared room heater system
US20140034631A1 (en) * 2012-08-06 2014-02-06 General Electric Company Heater assembly for an appliance
US9869053B2 (en) * 2012-08-06 2018-01-16 Haier Us Appliance Solutions, Inc. Heater assembly for an appliance
US10995971B2 (en) * 2018-11-29 2021-05-04 Ningbo Baogong Electrical Appliance Co., Ltd. Energy-saving and environment-friendly double-row air duct heater

Similar Documents

Publication Publication Date Title
US3211080A (en) Draft control unit
US4562827A (en) Downdraft countertop cooking range
US4043317A (en) Vented solar collector
KR20090053491A (en) Out door unit of an air conditioner
US3065686A (en) Lighting and ventilating fixture
US7046918B1 (en) Space heater with pretreated heat exchanger
US2231258A (en) Heating system
ES2738556T3 (en) Built-in type air conditioner
US2251649A (en) Air conditioning dehumidifier
US3559560A (en) Ceiling boxes for distributing air
US20030094010A1 (en) Single-package air conditioner
US2172667A (en) Furnace
US4003967A (en) Electric heating and humidifying apparatus
US3415073A (en) Roof-type air conditioning system
US2697163A (en) Mounting means for ceiling fans
EP1327825B1 (en) Improvements in a pellet stove
US3692977A (en) Compact combination infra-red heating and ventilating unit
US2237054A (en) Heating equipment
US5062280A (en) Air conditioning apparatus
US4179065A (en) Circulating air building heating system
US2277247A (en) Apparatus for multiple room heating and air conditioning
US2369511A (en) Refrigerating apparatus
US4147303A (en) Heat-saving smoke pipe attachment
US4607500A (en) Grille mounting for a room air conditioner
TW593941B (en) Outdoor unit of split type air conditioner