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re: repair of attic vent fan
14 jun 2004
m ransley  wrote:

>...a 400 watt fan running 12hr a day will be 20$ a month at 0.12kwh.

those 35-day months are killers :-)

>in winter its  plian old dumb.

keeping the heat in the attic would be less plian dumb. or bringing warm
air down into the house in wintertime, like this, viewed in a fixed font: 

 -------------------------  
|            |  /f        |    we might block the soffit and ridge vents 
x|       ----| / a <--   |x    and close manual doors over gable vents
x|      /f   |/  n       |x    and put one of grainger's 4tm66 fans near 
|  <-- / a   |   |        |    the top of a duct to push attic air down to
|     /  n   |   |        |    the house in wintertime, with another fan
|---------|||-|||---------|    close to the attic floor to pull air up,
|                         |    and 2 heavy plastic-film one-way dampers
|       winter day        |    that close when the fans are off.
                              
 -------------------------  
|            |  |f        | 
x|       ----|  |a       |x    grainger's $73 4tm66 16" window fans
x|      |f   |  |n       |x    move 5850 cfm with 90 watts... 
|       |a   |   |        | 
|       |n   |   |        |
|---------|||-|||---------|  
|                         |  
|      winter night       |  

 -------------------------  
|___         |   f|    ___| 
x        ----|   a|       x    brand electronics should soon be selling
x -->   |f   |   n|   --> x    a smart whole house fan controller with
|       |a   |   |        |    humidity sensors to automate this,
|       |n   |   |        |    and more...
|---------|||-|||---------|  
|                         |  
|       summer day        |  

 -------------------------
|___         |   f\    ___| 
x        ----|   a \      x    this could also work with non-reversible
x <--   /f   |   n  \ --> x    fans, if the upper fan isn't used 
|      / a   |   |        |    in summertime...
|     /  n   |   |        |
|---------|||-|||---------|  
|                         |  
|      summer night       |  
|                         |  
|                         |  
|                         |  
|-------------------------|
|___                   ___| 
x         basement        x
x -->      windows    <-- x  
|                         |  
|                         |  

nick




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