US2008283033A1PendingUtilityA1

Forced air furnace

48
Assignee: STELPRO DESIGNPriority: May 17, 2007Filed: May 17, 2007Published: Nov 20, 2008
Est. expiryMay 17, 2027(~0.8 yrs left)· nominal 20-yr term from priority
Inventors:Bertrand MichaudRichard E. Breton
F24H 9/2071F24H 15/238F24H 15/281F24H 15/20F24H 15/204F24H 15/33F24H 15/421F24H 15/176F24H 15/242F24H 15/35
48
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Claims

Abstract

A forced air furnace comprises an enclosure, an adjusting mechanism, an interface, an electric heating element and a fan. The enclosure has an air inlet and an air outlet. The adjusting mechanism is operative to adjust the air outlet between an open position and a partially closed position. The interface is located proximate to the air outlet and is used to connect the air outlet to a duct. The fan is powered by an electric motor. Both the fan and the electric heating element are located inside the enclosure. There is also described a method of installing a forced air furnace. The method comprises the step of adjusting a size of an exhaust area of an air outlet of the forced air furnace in order to produce a desired exhaust airflow through the exhaust area when the forced air furnace is connected to a ductwork.

Claims

exact text as granted — not AI-modified
1 . A forced air furnace comprising:
 an enclosure having an air inlet and an air outlet;   an adjusting mechanism for adjusting said air outlet between an open position and a partially closed position;   an interface proximate said air outlet for connecting said air outlet to a duct;   an electric heating element inside said enclosure; and   a fan powered by an electric motor, said fan being inside said enclosure.   
   
   
       2 . The forced air furnace of  claim 1  further comprising a controller for controlling said adjusting mechanism. 
   
   
       3 . The forced air furnace of  claim 2  wherein said controller is further operative to control a speed of said fan. 
   
   
       4 . The forced air furnace of  claim 3  further comprising a temperature sensor for measuring a temperature inside said enclosure and outputting a temperature signal to said controller, said controller being operative to adjust said adjusting mechanism and said fan speed based on said temperature signal. 
   
   
       5 . The forced air furnace of  claim 4  further comprising an airflow meter for measuring an airflow and outputting an airflow signal to said controller, said controller being operative to adjust said adjusting mechanism and said fan speed based on said airflow signal. 
   
   
       6 . The forced air furnace of  claim 5  wherein said airflow meter is located proximate said air outlet. 
   
   
       7 . The forced air furnace of  claim 4  further comprising a pressure sensor for measuring an air pressure inside said enclosure and outputting a pressure signal to said controller, said controller adjusting said adjusting mechanism based on said pressure signal. 
   
   
       8 . The forced air furnace of  claim 4  further comprising a current sensor for reading a current value of said electric motor and outputting a current signal to said controller, said controller being operative to adjust said adjusting mechanism and said fan speed based on said current signal. 
   
   
       9 . The forced air furnace of  claim 4  wherein said adjusting mechanism comprises louvers. 
   
   
       10 . The forced air furnace of  claim 1  wherein said adjusting mechanism comprises louvers, said louvers being manually adjustable in pairs. 
   
   
       11 . The forced air furnace of  claim 1  wherein said adjusting mechanism comprises louvers and a biasing mechanism attached to said louvers, said biasing mechanism being operative to bias said louvers in a closed position. 
   
   
       12 . A method of installing a forced air furnace comprising the step of adjusting a size of an exhaust area of an air outlet of said forced air furnace to produce a desired exhaust airflow at a selected fan speed through said exhaust area. 
   
   
       13 . The method of  claim 12  wherein said step of adjusting is performed based on a temperature inside said forced air furnace. 
   
   
       14 . The method of  claim 13  wherein said step of adjusting is performed based on an airflow through said air outlet. 
   
   
       15 . The method of  claim 14  wherein said step of adjusting is performed based on a pressure inside said forced air furnace. 
   
   
       16 . The method of  claim 15  wherein said step of adjusting is performed based on a value of a current drawn by said electric fan motor inside said forced air furnace. 
   
   
       17 . The method of  claim 16  wherein said step of adjusting comprises adjusting louvers. 
   
   
       18 . The method of  claim 12  wherein said step of selecting a fan speed is performed based on a pressure inside said forced air furnace. 
   
   
       19 . The method of  claim 18  wherein said fan speed is selected based on an airflow through said air outlet. 
   
   
       20 . The method of  claim 12  wherein said step of adjusting is performed once said forced air furnace is connected to a ductwork.

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