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How to calculate CFM for bathroom with steam shower

How to calculate CFM for bathroom with steam shower


  #1  
Old 03-15-07, 09:31 AM
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How to calculate CFM for bathroom with steam shower

I am in the finishing stages of bathroom remodel. I have 3x5x8 steam shower in the bath that is about 5x11x8 ft in size. Can someone help with choosing the correct sized exhaust fan?
 
  #2  
Old 03-17-07, 07:34 AM
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Exhaust Fan

Your bathroom seems like a normal sized bathroom. Any good bathroom exhaust fan from a home center should work fine.

Good luck with your project.
 
  #3  
Old 03-17-07, 08:09 AM
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Exhaust Fan

To be more specific, your bathroom volume is 440 cubic feet. An 80 cfm fan would give you 10.9 air changes per hour. I hope this helps. Good luck.
 
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Old 03-17-07, 09:27 AM
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How to calculate CFM for bathroom with steam shower

You said steam shower. - There is nothing wrong to have excess capicity. You may want a better quality fan to keep the noise down. Nothing is worse than a noisy fan that does not do the job.

Dick
 
  #5  
Old 03-18-07, 04:09 PM
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Thanks for your help!


I decided to go with Fatech 230cfms...it comes with two grills and halogen lights....fan will be in the attic....kinda expensive though
 
  #6  
Old 03-19-07, 05:46 AM
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Exhaust Fan

Make sure your unit gets vented to the outside. Do not allow the exhausted air to remain in the attic. Good luck with your project.
 
  #7  
Old 03-19-07, 12:51 PM
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Ok...thanks
 
  #8  
Old 03-28-07, 06:29 PM
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OK...ended up buying 230 cfm fantech fan...comes with two grill/slights....

the store guy said , i should use insulated ducts....which are like 30 bucks/25 ft

are those necessary?...bathroom is in the second floor under the attic which obviously isnt heated....home depot sells the aluminium ones for $8.
 
  #9  
Old 03-30-07, 07:23 AM
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The insulated duct work will help minimize condenstation on the inside of the duct, which could be a major problem on you steam room exhaust.

Let's have some perspecitve on this.....you want to scrimp on fifty bucks and risk rust damage inside your $250 fan, or even worse, mold in your attic where the zeros behind the dollar sign would add up fast.
 
  #10  
Old 03-30-07, 10:41 AM
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Just a thought before you begin...make sure to leave a 'condensate sump' in the line as it exits the fan. There should be a spot along the line that is slightly lower than the fan exhaust outlet. This will prevent any vapor that condenses in the exhaust hose from pouring back through the fan. I have been called to jobs where this was occurring.
 
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Old 03-31-07, 06:39 PM
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ended up using the insulated ducts from the fantech....didnt know the rationale behind using the insulated ducts when i posted...

leaving a sump is a good idea...but do i want the water collect in sump? or would it eventually evaporate away... i hope i wont get condesate after using the insulated ducts though
 
  #12  
Old 03-31-07, 08:00 PM
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With the insulated duct it won't be much and it will evaporate away
 
 

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